[
 {
  "date": "-2500",
  "label": "Mohenjo-daro's drains",
  "detail": "Mohenjo-daro in the Indus Valley flourishes from about 2500 BC with grid streets and covered brick street drains.",
  "source_url": "https://whc.unesco.org/en/list/138",
  "era": "Ancient and medieval"
 },
 {
  "date": "-0312",
  "label": "Aqua Appia",
  "detail": "Rome's first aqueduct is commissioned by the censor Appius Claudius Caecus.",
  "source_url": "https://en.wikipedia.org/wiki/Roman_aqueduct",
  "era": "Ancient and medieval"
 },
 {
  "date": "1666-09-02",
  "label": "Great Fire of London",
  "detail": "The fire starts in a Pudding Lane bakery and destroys 13,200 houses and 87 parish churches.",
  "source_url": "https://www.london-fire.gov.uk/museum/history-and-stories/the-great-fire-of-london",
  "era": "Ancient and medieval"
 },
 {
  "date": "1667-02-08",
  "label": "Rebuilding of London Act",
  "detail": "The act favors brick and stone, regulates street widths and bans overhanging upper floors. (Named the 1666 Act; royal assent came in February 1667.)",
  "source_url": "https://en.wikipedia.org/wiki/Rebuilding_of_London_Act_1666",
  "era": "Ancient and medieval"
 },
 {
  "date": "1807",
  "label": "Gas lamps on Pall Mall",
  "detail": "Frederick Winsor lights London's Pall Mall with gas, using old musket barrels as pipes.",
  "source_url": "https://www.londonmuseum.org.uk/collections/london-stories/gas-lamps-illuminated-london/",
  "era": "Sanitary city (1800s)"
 },
 {
  "date": "1807-06-04",
  "label": "Gas lights Pall Mall",
  "detail": "Frederick Albert Winsor gives the first public demonstration of gas street lighting on Pall Mall, London, using old musket barrels as pipes.",
  "source_url": "https://en.wikipedia.org/wiki/Street_light",
  "era": "Sanitary city (1800s)"
 },
 {
  "date": "1812",
  "label": "First gas company chartered",
  "detail": "London's Gas Light and Coke Company, the world's first gas company, receives a royal charter.",
  "source_url": "https://www.londonmuseum.org.uk/collections/london-stories/gas-lamps-illuminated-london/",
  "era": "Sanitary city (1800s)"
 },
 {
  "date": "1820",
  "label": "20,000 pigs eat New York's garbage",
  "detail": "About 20,000 pigs roam New York's streets, roughly one per five residents, eating organic waste.",
  "source_url": "https://backstory.newamericanhistory.org/episodes/another-mans-treasure/3",
  "era": "Sanitary city (1800s)"
 },
 {
  "date": "1823-01-22",
  "label": "Boston Gas Light Company chartered",
  "detail": "Boston charters its first gas company.",
  "source_url": "https://newenglandhistoricalsociety.com/first-gas-light-company/",
  "era": "Sanitary city (1800s)"
 },
 {
  "date": "1829-01-01",
  "label": "Boston's first gas street lamp",
  "detail": "Boston lights its first public gas street lamp in Dock Square, near Faneuil Hall.",
  "source_url": "https://newenglandhistoricalsociety.com/first-gas-light-company/",
  "era": "Sanitary city (1800s)"
 },
 {
  "date": "1842",
  "label": "Croton Aqueduct opens",
  "detail": "New York's gravity-fed Croton Aqueduct begins service; its reservoirs about 60 feet above the city push water to roughly the sixth story.",
  "source_url": "https://www.vitalcitynyc.org/nyc-wooden-water-tanks-architecture-history/",
  "era": "Sanitary city (1800s)"
 },
 {
  "date": "1849",
  "label": "New York removes its street pigs",
  "detail": "After a cholera epidemic, the city finally corrals the pigs, 5,000 to 6,000 by June 1849.",
  "source_url": "https://backstory.newamericanhistory.org/episodes/another-mans-treasure/3",
  "era": "Sanitary city (1800s)"
 },
 {
  "date": "1852-04-28",
  "label": "Boston fire alarm telegraph",
  "detail": "Boston opens the first municipal electric fire alarm telegraph, with 40 street boxes.",
  "source_url": "https://ethw.org/Milestones:Electric_Fire_Alarm_System,_1852",
  "era": "Sanitary city (1800s)"
 },
 {
  "date": "1854-08-31",
  "label": "Broad Street cholera outbreak",
  "detail": "A Soho outbreak kills about 500 people in 10 days; John Snow traces it to a single water pump.",
  "source_url": "https://www.londonmuseum.org.uk/collections/london-stories/john-snow-cholera-broad-street-pump/",
  "era": "Sanitary city (1800s)"
 },
 {
  "date": "1857",
  "label": "Back Bay filling begins",
  "detail": "Boston begins filling the polluted Back Bay with gravel brought by rail from Needham.",
  "source_url": "https://en.wikipedia.org/wiki/Back_Bay,_Boston",
  "era": "Sanitary city (1800s)"
 },
 {
  "date": "1858",
  "label": "The Great Stink",
  "detail": "A foul summer on the Thames leads to Joseph Bazalgette's intercepting sewers.",
  "source_url": "https://ice.org.uk/what-is-civil-engineering/infrastructure-projects/london-sewer-system",
  "era": "Sanitary city (1800s)"
 },
 {
  "date": "1859",
  "label": "Bazalgette's sewers begin",
  "detail": "London starts building Joseph Bazalgette's intercepting sewers, completed in 1875, a combined system that overflows to the Thames.",
  "source_url": "https://en.wikipedia.org/wiki/Thames_Tideway_Tunnel",
  "era": "Sanitary city (1800s)"
 },
 {
  "date": "1863-01",
  "label": "London's first underground railway",
  "detail": "The Metropolitan Railway opens between Paddington and Farringdon. (date disputed: January 9 or 10)",
  "source_url": "https://heritagefund.org.uk/news/worlds-oldest-tube-carriage-rides-again-150th-anniversary-london-underground",
  "era": "Sanitary city (1800s)"
 },
 {
  "date": "1868-12-09",
  "label": "First traffic signal, London",
  "detail": "A gas-lit semaphore signal by John Peake Knight goes up outside the Houses of Parliament; it explodes in 1869. (date disputed: 9 or 10 December)",
  "source_url": "https://en.wikipedia.org/wiki/History_of_traffic_lights",
  "era": "Sanitary city (1800s)"
 },
 {
  "date": "1872-11-09",
  "label": "Great Boston Fire",
  "detail": "The fire burns about 65 acres and 776 buildings downtown, helped by weak water pressure and locked alarm boxes.",
  "source_url": "https://en.wikipedia.org/wiki/Great_Boston_Fire_of_1872",
  "era": "Sanitary city (1800s)"
 },
 {
  "date": "1873",
  "label": "Gamewell factory in Newton Highlands",
  "detail": "Gamewell and Kennard open a fire alarm factory, turning Boston's invention into a national industry.",
  "source_url": "https://buildingsofnewengland.com/2026/08/16/gamewell-fire-alarm-and-telegraph-company-factory-1889/",
  "era": "Sanitary city (1800s)"
 },
 {
  "date": "1878-05-30",
  "label": "Electric arc lights in Paris",
  "detail": "Paris installs electric street lights on the avenue de l'Opera.",
  "source_url": "https://en.wikipedia.org/wiki/Street_light",
  "era": "Sanitary city (1800s)"
 },
 {
  "date": "1879-04-29",
  "label": "Cleveland's arc lights",
  "detail": "Cleveland demonstrates 12 arc lights around Public Square.",
  "source_url": "https://en.wikipedia.org/wiki/Street_light",
  "era": "Sanitary city (1800s)"
 },
 {
  "date": "1882-03-03",
  "label": "New York district steam begins",
  "detail": "The New York Steam Company begins service in Manhattan; it merges into Con Edison in 1954.",
  "source_url": "https://en.wikipedia.org/wiki/New_York_City_steam_system",
  "era": "Networked city (1880-1945)"
 },
 {
  "date": "1882-09-04",
  "label": "Pearl Street Station",
  "detail": "Edison's central station begins supplying lower Manhattan with direct current.",
  "source_url": "https://ethw.org/Milestones:Pearl_Street_Station",
  "era": "Networked city (1880-1945)"
 },
 {
  "date": "1886",
  "label": "Gamewell in 250 cities",
  "detail": "Gamewell fire alarm systems run in more than 250 US and Canadian cities.",
  "source_url": "https://buildingsofnewengland.com/2026/08/16/gamewell-fire-alarm-and-telegraph-company-factory-1889/",
  "era": "Networked city (1880-1945)"
 },
 {
  "date": "1888-02",
  "label": "Richmond electric streetcars",
  "detail": "Frank Sprague's Richmond system becomes the model for electric street railways, including Boston's.",
  "source_url": "https://ethw.org/Milestones:Richmond_Union_Passenger_Railway,_1888",
  "era": "Networked city (1880-1945)"
 },
 {
  "date": "1890",
  "label": "First rooftop tank firm",
  "detail": "Isseks Brothers is founded, the first company formed specifically to build New York's rooftop water tanks.",
  "source_url": "https://www.vitalcitynyc.org/nyc-wooden-water-tanks-architecture-history/",
  "era": "Networked city (1880-1945)"
 },
 {
  "date": "1895",
  "label": "Waring takes over NYC street cleaning",
  "detail": "Sanitary engineer George E. Waring Jr. arrives; his first step is a law requiring horses and carts to be stabled overnight.",
  "source_url": "https://en.wikipedia.org/wiki/George_E._Waring_Jr.",
  "era": "Networked city (1880-1945)"
 },
 {
  "date": "1897-09-01",
  "label": "First US subway",
  "detail": "Boston's Tremont Street Subway opens from Park Street to Boylston; more than 100,000 ride on day one.",
  "source_url": "https://www.massmoments.org/moment-details.html?mid=254",
  "era": "Networked city (1880-1945)"
 },
 {
  "date": "1897-09-01",
  "label": "First US subway opens in Boston",
  "detail": "The Tremont Street Subway opens at Boylston and Park Street; more than 100,000 people ride on day one.",
  "source_url": "https://www.massmoments.org/moment-details.html?mid=254",
  "era": "Networked city (1880-1945)"
 },
 {
  "date": "1898-10-29",
  "label": "Waring dies",
  "detail": "Waring dies of yellow fever contracted while studying sanitation in Cuba.",
  "source_url": "https://en.wikipedia.org/wiki/George_E._Waring_Jr.",
  "era": "Networked city (1880-1945)"
 },
 {
  "date": "1914-08-05",
  "label": "Electric signal tested in Cleveland",
  "detail": "A red and green electric signal is tested at Euclid Avenue and East 105th Street, switched by hand from a booth.",
  "source_url": "https://www.clevelandpolicemuseum.org/historical/early-electric-traffic-signals/",
  "era": "Networked city (1880-1945)"
 },
 {
  "date": "1917",
  "label": "First interconnected signals",
  "detail": "Salt Lake City links six intersections to one manual switch.",
  "source_url": "https://en.wikipedia.org/wiki/History_of_traffic_lights",
  "era": "Networked city (1880-1945)"
 },
 {
  "date": "1920",
  "label": "Three-color signal in Detroit",
  "detail": "William Potts' three-color, four-direction signal is installed at Woodward Avenue and Fort Street.",
  "source_url": "https://www.thehenryford.org/collections/explore/artifact/227457",
  "era": "Networked city (1880-1945)"
 },
 {
  "date": "1923-11-20",
  "label": "Garrett Morgan's signal patent",
  "detail": "Morgan receives US Patent 1,475,024 for a hand-cranked three-position signal with an all-stop position; it was not the first traffic light.",
  "source_url": "https://en.wikipedia.org/wiki/History_of_traffic_lights",
  "era": "Networked city (1880-1945)"
 },
 {
  "date": "1928-03",
  "label": "Britain's first permanent automatic signals",
  "detail": "Automatic signals are installed permanently at Park Row and Bond Street in Leeds.",
  "source_url": "https://en.wikipedia.org/wiki/History_of_traffic_lights",
  "era": "Networked city (1880-1945)"
 },
 {
  "date": "1937",
  "label": "NYC incinerators peak",
  "detail": "New York runs 21 municipal incinerators; only ten remain by 1946.",
  "source_url": "https://en.wikipedia.org/wiki/Fresh_Kills_Landfill",
  "era": "Networked city (1880-1945)"
 },
 {
  "date": "1937-06-30",
  "label": "999 launches in London",
  "detail": "The world's first emergency telephone number, prompted by a fatal 1935 Marylebone fire.",
  "source_url": "https://www.atlasobscura.com/articles/happy-birthday-to-the-worlds-first-emergency-number",
  "era": "Networked city (1880-1945)"
 },
 {
  "date": "1938-04-28",
  "label": "Quabbin towns dissolved",
  "detail": "Dana, Enfield, Greenwich and Prescott, Massachusetts, are disincorporated at midnight to make way for the Quabbin Reservoir; about 2,500 people are displaced.",
  "source_url": "https://vitabrevis.americanancestors.org/2019/09/lost-towns-of-the-quabbin",
  "era": "Networked city (1880-1945)"
 },
 {
  "date": "1946-06-22",
  "label": "Quabbin Reservoir full",
  "detail": "The reservoir that drowned four Massachusetts towns is declared full; it supplies 46 metro Boston communities.",
  "source_url": "https://www.massmoments.org/moment-details/quabbin-reservoir-filled-to-the-brim.html",
  "era": "Networked city (1880-1945)"
 },
 {
  "date": "1948",
  "label": "Fresh Kills opens",
  "detail": "The first garbage scow arrives at Fresh Kills on Staten Island, a landfill meant to be temporary.",
  "source_url": "https://en.wikipedia.org/wiki/Fresh_Kills_Landfill",
  "era": "Car city (1945-1980)"
 },
 {
  "date": "1949",
  "label": "GM and partners convicted",
  "detail": "A federal jury convicts GM, Firestone, Standard Oil of California, Phillips and Mack of conspiring to monopolize bus sales to National City Lines companies, and acquits them on transit ownership.",
  "source_url": "https://en.wikipedia.org/wiki/General_Motors_streetcar_conspiracy",
  "era": "Car city (1945-1980)"
 },
 {
  "date": "1952",
  "label": "One computer, 120 signals",
  "detail": "Denver uses a single computer to control 120 traffic lights.",
  "source_url": "https://en.wikipedia.org/wiki/History_of_traffic_lights",
  "era": "Car city (1945-1980)"
 },
 {
  "date": "1956",
  "label": "Federal-Aid Highway Act",
  "detail": "The US authorizes over 41,000 miles of interstates with 90% federal funding.",
  "source_url": "https://spotlight-prod.galib.uga.edu/spotlight/urban-renewal/feature/the-interstate-highway-system",
  "era": "Car city (1945-1980)"
 },
 {
  "date": "1968",
  "label": "Congress orders bridge inspection standards",
  "detail": "The Federal-Aid Highway Act directs the creation of national bridge inspection standards.",
  "source_url": "https://www.fhwa.dot.gov/bridge/nbis.cfm",
  "era": "Car city (1945-1980)"
 },
 {
  "date": "1968-02-16",
  "label": "First 911 call",
  "detail": "Rankin Fite calls Tom Bevill in Haleyville, Alabama, on the Alabama Telephone Company network.",
  "source_url": "https://www.smithsonianmag.com/smart-news/dial-up-the-story-of-the-first-911-call-which-was-placed-on-this-day-in-1968-180985980/",
  "era": "Car city (1945-1980)"
 },
 {
  "date": "1971",
  "label": "First NBIS published",
  "detail": "The first National Bridge Inspection Standards create the first nationally coordinated US bridge inspection program.",
  "source_url": "https://www.fhwa.dot.gov/bridge/nbis.cfm",
  "era": "Car city (1945-1980)"
 },
 {
  "date": "1972",
  "label": "Clean Water Act",
  "detail": "Congress passes amendments requiring permits for pipe discharges and funding sewage plants, over President Nixon's veto.",
  "source_url": "https://www.epa.gov/laws-regulations/history-clean-water-act",
  "era": "Regulated city (1970-2010)"
 },
 {
  "date": "1974-04-01",
  "label": "Roosevelt Island trash tubes open",
  "detail": "An Envac pneumatic system begins moving trash at 60 to 70 mph through 20-inch tubes.",
  "source_url": "https://untappedcities.com/2020/04/09/inside-roosevelt-islands-futuristic-pneumatic-tube-trash-system/",
  "era": "Car city (1945-1980)"
 },
 {
  "date": "1975",
  "label": "SCATS developed in Sydney",
  "detail": "The New South Wales Department of Main Roads develops SCATS, one of the first commercially available adaptive signal systems.",
  "source_url": "https://scats.nsw.gov.au/about-us",
  "era": "Car city (1945-1980)"
 },
 {
  "date": "1975",
  "label": "Right turn on red goes national",
  "detail": "The Energy Policy and Conservation Act ties federal energy aid to states allowing right turn on red.",
  "source_url": "https://sauerburger.org/rtor.html",
  "era": "Car city (1945-1980)"
 },
 {
  "date": "1977",
  "label": "BWSC created",
  "detail": "The Massachusetts legislature creates the Boston Water and Sewer Commission, a body separate from the city that sets its own rates.",
  "source_url": "https://en.wikipedia.org/wiki/Boston_Water_and_Sewer_Commission",
  "era": "Car city (1945-1980)"
 },
 {
  "date": "1979",
  "label": "SCOOT developed in the UK",
  "detail": "The Transport Research Laboratory develops SCOOT adaptive control for the Department of Transport.",
  "source_url": "https://en.wikipedia.org/wiki/Split_Cycle_Offset_Optimisation_Technique",
  "era": "Regulated city (1970-2010)"
 },
 {
  "date": "1980",
  "label": "Proposition 2½ approved",
  "detail": "Massachusetts voters cap property tax levy growth at 2.5% a year plus new construction; the law took effect in FY1982.",
  "source_url": "https://www.mass.gov/doc/chapter-3-proposition-2-12/download",
  "era": "Regulated city (1970-2010)"
 },
 {
  "date": "1982",
  "label": "Quincy sues over Boston Harbor",
  "detail": "The city of Quincy sues over harbor pollution, followed by the Conservation Law Foundation and the US government.",
  "source_url": "https://en.wikipedia.org/wiki/Boston_Harbor",
  "era": "Regulated city (1970-2010)"
 },
 {
  "date": "1985",
  "label": "MWRA created",
  "detail": "The Massachusetts Water Resources Authority splits off from the Metropolitan District Commission to run wholesale water and sewage treatment.",
  "source_url": "https://en.wikipedia.org/wiki/Massachusetts_Water_Resources_Authority",
  "era": "Regulated city (1970-2010)"
 },
 {
  "date": "1985",
  "label": "MWRA takes over",
  "detail": "The new Massachusetts Water Resources Authority takes over Greater Boston's water and sewer systems.",
  "source_url": "https://www.mwra.com/harbor/html/bostonharborproject.htm",
  "era": "Regulated city (1970-2010)"
 },
 {
  "date": "1986",
  "label": "Boston Harbor court schedule",
  "detail": "Federal Judge A. David Mazzone sets a 13-year construction schedule for cleaning up Boston Harbor.",
  "source_url": "https://www.mwra.com/harbor/html/bostonharborproject.htm",
  "era": "Regulated city (1970-2010)"
 },
 {
  "date": "1986",
  "label": "Deer Island schedule ordered",
  "detail": "Federal Judge A. David Mazzone orders a 13-year schedule to build the Deer Island treatment plant.",
  "source_url": "https://www.mwra.com/harbor/html/bostonharborproject.htm",
  "era": "Regulated city (1970-2010)"
 },
 {
  "date": "1988",
  "label": "\"Harbor of shame\"",
  "detail": "George H.W. Bush tours Boston Harbor and calls it a \"harbor of shame\" in the presidential race against Michael Dukakis.",
  "source_url": "https://theconversation.com/tumor-free-flounder-are-just-1-dividend-from-the-cleanup-of-boston-harbor-109217",
  "era": "Regulated city (1970-2010)"
 },
 {
  "date": "1991",
  "label": "Sludge dumping ends",
  "detail": "Sludge discharges to Boston Harbor end; sludge goes to a Fore River plant to become fertilizer pellets.",
  "source_url": "https://www.mwra.com/harbor/html/bostonharborproject.htm",
  "era": "Regulated city (1970-2010)"
 },
 {
  "date": "1991-07-29",
  "label": "EU adopts 112",
  "detail": "Council Decision 91/396/EEC makes 112 the single European emergency number alongside national numbers.",
  "source_url": "https://eena.org/knowledge-hub/documents/112-and-the-eu-legislative-framework",
  "era": "Regulated city (1970-2010)"
 },
 {
  "date": "1992",
  "label": "NEMA TS 2 standard",
  "detail": "The TS 2 controller standard adds a serial data link and defines coordination and preemption.",
  "source_url": "https://www.access-board.gov/research/prow/interfacing-aps/appendix-a/",
  "era": "Regulated city (1970-2010)"
 },
 {
  "date": "1995",
  "label": "South Korea adopts designated bags",
  "detail": "South Korea introduces designated garbage bags; food waste recycling is 2% that year.",
  "source_url": "https://en.wikipedia.org/wiki/Recycling_in_South_Korea",
  "era": "Regulated city (1970-2010)"
 },
 {
  "date": "1996-10-02",
  "label": "Baltimore launches 311",
  "detail": "The first 311 line opens to divert police non-emergency calls.",
  "source_url": "https://en.wikipedia.org/wiki/311_(telephone_number)",
  "era": "Regulated city (1970-2010)"
 },
 {
  "date": "1997",
  "label": "Ampelmännchen saved",
  "detail": "A citizen campaign wins the right to keep East Berlin's walking-man signal, which becomes a registered trademark.",
  "source_url": "https://germanhistorydocs.org/en/a-new-germany-1990-2023/east-german-ampelmaennchen",
  "era": "Regulated city (1970-2010)"
 },
 {
  "date": "1997-02-18",
  "label": "FCC reserves 311",
  "detail": "FCC 97-51 assigns 311 nationwide for non-emergency government services, and 711 for relay services.",
  "source_url": "https://www.govinfo.gov/content/pkg/FR-1997-02-26/html/97-4787.htm",
  "era": "Regulated city (1970-2010)"
 },
 {
  "date": "1998",
  "label": "First ASCE Report Card",
  "detail": "The American Society of Civil Engineers begins grading US infrastructure.",
  "source_url": "https://www.asce.org/publications-and-news/civil-engineering-source/society-news/article/2025/03/25/asce-report-card-gives-us-infrastructure-highest-ever-c-grade",
  "era": "Regulated city (1970-2010)"
 },
 {
  "date": "2000",
  "label": "Transport for London created",
  "detail": "TfL is created under the Greater London Authority Act 1999, with a board appointed and chaired by the Mayor of London.",
  "source_url": "https://en.wikipedia.org/wiki/Transport_for_London",
  "era": "Regulated city (1970-2010)"
 },
 {
  "date": "2000",
  "label": "Deer Island outfall finished",
  "detail": "The MWRA completes a deep-water sewage outfall as part of the Boston Harbor cleanup.",
  "source_url": "https://en.wikipedia.org/wiki/Massachusetts_Water_Resources_Authority",
  "era": "Regulated city (1970-2010)"
 },
 {
  "date": "2000",
  "label": "Deer Island outfall opens",
  "detail": "Deer Island's 9.5-mile outfall tunnel into Massachusetts Bay opens.",
  "source_url": "https://www.mwra.com/harbor/html/bostonharborproject.htm",
  "era": "Regulated city (1970-2010)"
 },
 {
  "date": "2001-03-22",
  "label": "Fresh Kills takes last barge",
  "detail": "Fresh Kills closes under a 1996 state law, then briefly reopens after September 11 to sort World Trade Center debris.",
  "source_url": "https://en.wikipedia.org/wiki/Fresh_Kills_Landfill",
  "era": "Regulated city (1970-2010)"
 },
 {
  "date": "2001-07-16",
  "label": "Unfiltered supply upheld",
  "detail": "The First Circuit affirms that MWRA may treat its water with ozone instead of building a filtration plant.",
  "source_url": "https://caselaw.findlaw.com/court/us-1st-circuit/1004480.html",
  "era": "Regulated city (1970-2010)"
 },
 {
  "date": "2003",
  "label": "MetroWest tunnel in service",
  "detail": "MWRA's 17.6-mile MetroWest Water Supply Tunnel goes into service, backing up the 1940s Hultman Aqueduct.",
  "source_url": "https://www.mwra.com/node/4741",
  "era": "Regulated city (1970-2010)"
 },
 {
  "date": "2003-03",
  "label": "NYC311 launches",
  "detail": "New York's 311 service opens and becomes the model for big-city service desks.",
  "source_url": "https://en.wikipedia.org/wiki/311_(telephone_number)",
  "era": "Regulated city (1970-2010)"
 },
 {
  "date": "2004",
  "label": "Horse manure crisis story first published",
  "detail": "Stephen Davies publishes \"The Great Horse-Manure Crisis of 1894\"; its famous Times quote has never been found.",
  "source_url": "https://en.wikipedia.org/wiki/Great_horse_manure_crisis_of_1894",
  "era": "Regulated city (1970-2010)"
 },
 {
  "date": "2005",
  "label": "Carroll plant opens",
  "detail": "The John J. Carroll Water Treatment Plant in Marlborough begins treating metro Boston's water with ozone.",
  "source_url": "https://www.mwra.com/node/1437",
  "era": "Regulated city (1970-2010)"
 },
 {
  "date": "2005",
  "label": "South Korea bans landfilling food waste",
  "detail": "Food waste recycling later reaches 95%.",
  "source_url": "https://en.wikipedia.org/wiki/Recycling_in_South_Korea",
  "era": "Regulated city (1970-2010)"
 },
 {
  "date": "2005-12-07",
  "label": "GTFS begins in Portland",
  "detail": "Google Transit launches with TriMet data, the start of the GTFS transit data format.",
  "source_url": "https://beyondtransparency.org/part-2/pioneering-open-data-standards-the-gtfs-story/",
  "era": "Regulated city (1970-2010)"
 },
 {
  "date": "2006-07-10",
  "label": "Big Dig ceiling collapse",
  "detail": "About 12 tons of concrete ceiling panels fall in the I-90 connector tunnel, killing Milena Del Valle; the NTSB later blames epoxy creep.",
  "source_url": "https://www.npr.org/2007/07/10/11852203/report-epoxy-blamed-in-fatal-big-dig-accident",
  "era": "Regulated city (1970-2010)"
 },
 {
  "date": "2006-08-02",
  "label": "New England's all-time peak",
  "detail": "The New England grid sets its record peak demand of 28,130 MW, a record that still stands as of October 2026.",
  "source_url": "https://iso-ne.com/about/key-stats",
  "era": "Regulated city (1970-2010)"
 },
 {
  "date": "2007",
  "label": "Big Dig completed",
  "detail": "Boston's Central Artery/Tunnel Project, begun in 1991, is completed.",
  "source_url": "https://britannica.com/topic/Central-Artery-Tunnel-Project",
  "era": "Regulated city (1970-2010)"
 },
 {
  "date": "2009-07",
  "label": "Citizens Connect app",
  "detail": "Boston's smartphone reporting app lets residents photograph problems with GPS location and get a tracking number.",
  "source_url": "https://csmonitor.com/Technology/Horizons/2009/0709/spot-graffiti-or-a-pothole-report-it-with-your-iphone",
  "era": "Regulated city (1970-2010)"
 },
 {
  "date": "2010",
  "label": "Boston starts LED conversion",
  "detail": "Boston begins converting its streetlights to LED in the fall; by 2022 about 85% are LED.",
  "source_url": "https://search.boston.gov/node/2181",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2010",
  "label": "Boston water main break",
  "detail": "A May 2010 break shows MWRA's metro tunnels need backup and leads to the Metropolitan Water Tunnel Program.",
  "source_url": "https://www.mwra.com/node/4287",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2010-03-03",
  "label": "Open311 announced",
  "detail": "US Federal CIO Vivek Kundra announces a uniform API for 311 service requests.",
  "source_url": "https://en.wikipedia.org/wiki/311_(telephone_number)",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2012-06-28",
  "label": "First Wireless Emergency Alert",
  "detail": "A National Weather Service flash flood warning near Santa Fe, New Mexico.",
  "source_url": "https://www.weather.gov/news/062422-wea-10yr",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2014",
  "label": "Living With Water competition",
  "detail": "Boston launches a design competition that draws 50 teams from seven countries to redesign sites for seas five feet higher.",
  "source_url": "https://commonwealthbeacon.org/environment/preparing-for-a-shrinking-boston/",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2014",
  "label": "Massachusetts gas leaks law",
  "detail": "A state law creates the Gas System Enhancement Plan to fund replacement of leak-prone gas pipe.",
  "source_url": "https://atholdailynews.com/2025/05/02/dpu-confronts-utilities-on-gas-pipe-replacement-60968273/",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2014-12-03",
  "label": "Virtual Singapore launched",
  "detail": "Singapore's city-scale digital twin starts as part of Smart Nation; completed in 2022.",
  "source_url": "https://en.wikipedia.org/wiki/Virtual_Singapore",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2015",
  "label": "Boston adopts Vision Zero",
  "detail": "Boston commits to eliminating traffic deaths by 2030.",
  "source_url": "https://media.wbur.org/wp/2026/07/Resolution-recommitting-the-City-of-Boston-to-Vision-Zero-2030.pdf",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2016-06",
  "label": "AMA streetlight guidance",
  "detail": "The American Medical Association urges communities to use street lighting of 3000K or lower, citing glare and melatonin suppression.",
  "source_url": "https://www.npr.org/sections/thetwo-way/2016/06/21/482936520/bright-bluish-white-led-streetlamps-bad-for-our-health-ama-says",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2016-12",
  "label": "Climate Ready Boston",
  "detail": "Boston releases its climate study, projecting about 1.5 feet of sea level rise by 2050 and at least 3 feet after 2070.",
  "source_url": "https://www.barrfoundation.org/blog/climate-resiliency-efforts-in-boston/",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2017",
  "label": "China launches National Sword",
  "detail": "In 2018 China bans many scrap imports and sets a 0.5% contamination limit; US plastic landfilling rises 23.2%.",
  "source_url": "https://www.buffalo.edu/news/releases/2022/03/029.html",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2017-04-06",
  "label": "Analyze Boston goes live",
  "detail": "Boston's open data portal launches with about 115 datasets.",
  "source_url": "https://blogs.microsoft.com/newengland/2017/03/30/analyze-boston-new-open-data-hub-helps-citizens-visualize-their-lives/",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2018-09-13",
  "label": "Merrimack Valley gas explosions",
  "detail": "Overpressurized gas causes fires and explosions in Lawrence, Andover and North Andover, damaging 131 structures and killing one person.",
  "source_url": "https://www.ntsb.gov:443/news/events/Documents/2019-PLD18MR003-BMG-abstract.pdf",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2018-09-26",
  "label": "FCC small cell order",
  "detail": "The FCC sets 60- and 90-day shot clocks and fee limits for small cell permits.",
  "source_url": "https://www.everycrsreport.com/files/2019-02-25_LSB10265_ddf589286a891d1b2d70884fa4eded9c3be66932.html",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2019",
  "label": "NYC passes Commercial Waste Zones law",
  "detail": "Local Law 199 divides the city into 20 zones with three authorized carters each.",
  "source_url": "https://www.nyc.gov/site/dsny/news/25-001/as-today-first-nyc-commercial-waste-zone-fully-implemented",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2019",
  "label": "Boston Zero Waste Plan",
  "detail": "Boston sets a target of 80% diversion by 2035, up from about 25%.",
  "source_url": "https://boston.gov/node/62786",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2019-09-24",
  "label": "NTSB finds probable cause",
  "detail": "The NTSB blames Columbia Gas' weak management and a low-pressure system without adequate overpressure protection.",
  "source_url": "https://www-s.ntsb.gov/news/press-releases/Pages/NR20190924.aspx",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2019-10",
  "label": "CopenHill ski slope opens",
  "detail": "A ski slope opens on the roof of Copenhagen's Amager Bakke waste-to-energy plant.",
  "source_url": "https://www.power-technology.com/projects/amager-bakke-waste-energy-plant/",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2020-05",
  "label": "Sidewalk Labs exits Quayside",
  "detail": "Sidewalk Labs pulls out of Toronto's 12-acre waterfront project, citing economic uncertainty.",
  "source_url": "https://fortune.com/2020/05/13/sidewalk-labs-toronto-waterfront-quayside-smart-city",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2020-06-24",
  "label": "Boston bans city facial surveillance",
  "detail": "The City Council votes unanimously to ban city use of facial surveillance.",
  "source_url": "https://www.wbur.org/news/2020/06/23/boston-facial-recognition-ban",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2021",
  "label": "Infrastructure law enacted",
  "detail": "The IIJA authorizes $1.2 trillion, including $550 billion in new funding.",
  "source_url": "https://www.ecmag.com/magazine/articles/article-detail/billions-of-dollars-in-federal-infrastructure-funding-left-unspent",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2021",
  "label": "Purple streetlights appear",
  "detail": "Reports of LED streetlights turning purple from phosphor failure begin; by 2022 they come from at least 30 US states.",
  "source_url": "https://en.wikipedia.org/wiki/2020s_purpling_of_streetlights",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2021",
  "label": "NYC ordered to install accessible signals",
  "detail": "A federal court orders New York City to install accessible pedestrian signals at 10,000 intersections within 10 years and at all signalized intersections by 2036.",
  "source_url": "https://dralegal.org/featured/federal-court-orders-new-york-city-to-install-thousands-of-accessible-crosswalk-signals-over-the-next-10-years/",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2022",
  "label": "Boston curbside food waste pilot",
  "detail": "Boston starts free curbside food waste collection for 10,000 households.",
  "source_url": "https://csmonitor.com/USA/Society/2026/0902/boston-compost-food-waste-recycle?icid=rss",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2022-03",
  "label": "Boston's first faux-gas LED",
  "detail": "Boston installs its first LED lamp designed to look like a gas lantern, in Bay Village.",
  "source_url": "https://www.bostonglobe.com/2022/03/15/science/boston-plans-replace-historic-gas-lamps-with-leds-effort-reduce-carbon-emissions",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2022-07",
  "label": "988 goes live",
  "detail": "The US Suicide and Crisis Lifeline gets a three-digit number.",
  "source_url": "https://www.gao.gov/products/GAO-26-108114",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2022-08-31",
  "label": "FTA releases MBTA safety findings",
  "detail": "The Federal Transit Administration finds the MBTA shifted resources from operations and maintenance to capital projects and issues special directives.",
  "source_url": "https://www.transit.dot.gov/about/news/after-safety-inspection-federal-transit-administration-issues-additional-special",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2022-12-12",
  "label": "Green Line Extension completed",
  "detail": "The Medford Branch opens, completing the 4.3-mile, seven-station GLX after the Union Square Branch opened in March.",
  "source_url": "https://en.wikipedia.org/wiki/Green_Line_Extension",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2023",
  "label": "National CSO Inventory",
  "detail": "EPA first publishes its National CSO Inventory, which counts about 700 US communities with combined sewers.",
  "source_url": "https://www.epa.gov/npdes/where-combined-sewer-overflow-outfalls-are-located",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2023-12-19",
  "label": "MUTCD 11th edition",
  "detail": "FHWA publishes the final rule for the 11th edition of the US traffic control rulebook, effective January 18, 2024.",
  "source_url": "https://mutcd.fhwa.dot.gov/index.htm",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2024",
  "label": "Electric boiler for Boston steam",
  "detail": "Vicinity Energy completes a 42 MW electric boiler at Kendall in Cambridge for the Boston-Cambridge steam system.",
  "source_url": "https://www.canarymedia.com/articles/clean-industry/bostons-century-old-steam-heat-system-is-getting-a-low-carbon-makeover",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2024-07",
  "label": "FCC NG911 order",
  "detail": "The FCC requires carriers to deliver 911 calls in IP format on request from 911 authorities.",
  "source_url": "https://www.fcc.gov/node/267074",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2024-07",
  "label": "Boston bus signal priority pilot",
  "detail": "Boston and the MBTA begin signal priority for routes 57 and 66 on Brighton Avenue; bus waiting at red lights falls 21%.",
  "source_url": "https://www.wbur.org/news/2025/02/03/mbta-boston-buses-transit-signal-priority-technology-newsletter",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2024-07",
  "label": "Boston Rodent Action Plan",
  "detail": "Boston adopts a multi-department rat plan that prioritizes sanitation over poison.",
  "source_url": "https://wgbh.org/news/local/2024-07-18/boston-launches-plan-to-address-rat-problem",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2024-08",
  "label": "US V2X deployment plan",
  "detail": "USDOT releases a national plan targeting V2X at 25% of signalized intersections in the 75 largest metro areas by 2028.",
  "source_url": "https://rcrwireless.com/20240819/policy/dot-releases-national-v2x-plan",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2024-08",
  "label": "MBTA tap-to-ride launches",
  "detail": "Contactless payment goes live on MBTA buses and Green Line and Mattapan trolleys (announced for Aug. 1).",
  "source_url": "https://masstransitmag.com/technology/fare-collection/news/55130435/ma-mbta-contactless-payment-goes-live-a-roughly-1-billion-investment",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2024-10-08",
  "label": "Lead rule finalized",
  "detail": "EPA announces the Lead and Copper Rule Improvements, requiring most US systems to replace lead service lines within 10 years.",
  "source_url": "https://www.bhfs.com/insight/leading-the-way-new-epa-rule-gives-10-years-to-replace-lead-drinking-water-service-lines/",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2024-12-15",
  "label": "Bus Network Redesign Phase 1",
  "detail": "The MBTA launches Frequent Routes 104, 109, 110 and a combined 116.",
  "source_url": "https://mbta.getanchor.io/news/2024-10-07/phase-1-bus-network-redesign-launches-december-15-bring-more-frequent-service.html",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2024-12-23",
  "label": "Last MBTA slow zone cleared",
  "detail": "The MBTA removes its final slow zone, down from 233 counted in September 2023.",
  "source_url": "https://www.nbcboston.com/news/local/mbta-slow-zones-progress/3584894/?amp=1",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2025-01",
  "label": "First NYC commercial waste zone complete",
  "detail": "Queens Central becomes the first fully implemented commercial waste zone.",
  "source_url": "https://www.nyc.gov/site/dsny/news/25-001/as-today-first-nyc-commercial-waste-zone-fully-implemented",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2025-03-25",
  "label": "ASCE grade C",
  "detail": "ASCE gives US infrastructure an overall C, its highest grade since the report card began.",
  "source_url": "https://www.asce.org/publications-and-news/civil-engineering-source/society-news/article/2025/03/25/asce-report-card-gives-us-infrastructure-highest-ever-c-grade",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2025-05-07",
  "label": "Tideway opened",
  "detail": "King Charles III officially opens London's Thames Tideway Tunnel, fully operational since February 2025.",
  "source_url": "https://en.wikipedia.org/wiki/Thames_Tideway_Tunnel",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2025-05-17",
  "label": "Washington becomes seventh EPR state",
  "detail": "Days after Maryland became the sixth, Washington enacts packaging EPR.",
  "source_url": "https://www.bdlaw.com/plastics/publications/maryland-becomes-sixth-state-to-enact-packaging-extended-producer-responsibility-washington-expected-to-follow/",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2025-06-24",
  "label": "Highest New England peak in a decade",
  "detail": "Demand hits 26,586 MW at 97 degrees F, and reserves run short for more than three hours without outages.",
  "source_url": "https://isonewswire.com/2025/10/23/summer-2025-recap-reliability-maintained-as-grid-sees-highest-peak-in-over-a-decade/",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2026",
  "label": "US grid batteries near 52 GW",
  "detail": "US utility-scale battery capacity reaches nearly 52 GW by mid-2026, with 14 GW more planned for the second half of the year.",
  "source_url": "https://www.eia.gov/todayinEnergy/detail.php?id=67925",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2026-03",
  "label": "Red Line car shells released",
  "detail": "US Customs and Border Protection releases Red Line car shells held for nearly 10 months under a forced-labor review.",
  "source_url": "https://www.axios.com/local/boston/2026/04/01/mbta-red-line-crrc-cars-springfield-delivery-2027-deadline-customs-release",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2026-03-05",
  "label": "MUTCD Revision 1",
  "detail": "Revision 1 of the 11th edition is published and takes effect, after the January 18, 2026 state adoption deadline.",
  "source_url": "https://mutcd.fhwa.dot.gov/index.htm",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2026-06-24",
  "label": "Boston FY27 budget passed",
  "detail": "The council passes a $4.9 billion operating budget and a $4.4 billion five-year capital plan funding 321 projects (date approximate, per WBUR report).",
  "source_url": "https://www.wbur.org/news/2026/06/24/wu-boston-city-council-pass-budget-ending-debate",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2026-09-30",
  "label": "IIJA authorities expire",
  "detail": "Federal infrastructure law program authorities reach their expiry date; a Senate bill would extend many to December 11, 2026.",
  "source_url": "https://www.naco.org/news/iija-authorities-expire-september-30-naco-urges-congress-uphold-full-funding-levels-highway",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2026-09-30",
  "label": "Lead rule argued in court",
  "detail": "Oral argument is held in the D.C. Circuit in AWWA v. EPA, the utility challenge to the lead rule.",
  "source_url": "https://www.nrdc.org/court-battles/american-water-works-association-et-v-epa-lead-and-copper-rule-improvements",
  "era": "Digital and climate city (2010-now)"
 },
 {
  "date": "2037-12-31",
  "label": "Lead line deadline",
  "detail": "Deadline under the LCRI for most US water systems to finish replacing lead service lines.",
  "source_url": "https://www.tn.gov/content/dam/tn/environment/water/compliance/wr_dw-lcri-quick-guide-service-line-replacements.pdf",
  "era": "Digital and climate city (2010-now)"
 }
]