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First YearWhereWhat It DidSource
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1973U.S.Required catalytic convertors for new vehicles
https://www.aqmd.gov/home/research/publications/50-years-of-progress#Birth%20of%20the%20First%20Unified%20Air%20Pollution%20Agency, https://sciencehistory.org/stories/magazine/clean-machine/#:~:text=Beginning%20with%20the%201975%20model,%2C%20nitrogen%2C%20and%20carbon%20dioxide.
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1975U.S.Set improving fuel efficiency standards for new vehicles
https://www.ucsusa.org/resources/brief-history-us-fuel-efficiency
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1975U.S.Set appliance energy efficiency standards that are regularly updated
https://www.energy.gov/eere/buildings/history-and-impacts#:~:text=At%20the%20national%20level%2C%20the,energy%20targets%20for%20consumer%20products.
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1983Bay AreaCapped NOx emissions from furnaces
https://www.baaqmd.gov/~/media/dotgov/files/rules/reg-9-rule-4-nitrogen-oxides-from-fan-type-residential-central-furnaces/2021-amendments/documents/20230307_fsr_rules0904and0906-pdf.pdf?la=en
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1990CaliforniaSet a decreasing cap on emissions from new vehicles
https://www.aqmd.gov/home/research/publications/50-years-of-progress#Birth%20of%20the%20First%20Unified%20Air%20Pollution%20Agency
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1992Bay AreaCapped NOx emissions from water heaters
https://www.baaqmd.gov/~/media/dotgov/files/rules/reg-9-rule-4-nitrogen-oxides-from-fan-type-residential-central-furnaces/2021-amendments/documents/20230307_fsr_rules0904and0906-pdf.pdf?la=en
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1993Southern CaliforniaSet a decreasing cap on NOx and SOx emissions from industry
https://www.aqmd.gov/home/research/publications/50-years-of-progress#Birth%20of%20the%20First%20Unified%20Air%20Pollution%20Agency
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2009U.S.Capped GHG emissions for new light-duty vehicles
https://www.ucsusa.org/resources/brief-history-us-fuel-efficiency
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