Use on car exhaust systems was federally mandated in 1970 by the Clean Air Act - increase N2O emissions - though t - what extent is under debate. They point out that converters reduce emissions of another greenhouse gas - ozone - as well as carbon mo

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1. Use on car exhaust systems was federally mandated in 1970 by the Clean Air Act - increase N2O emissions - though t - what extent is under debate. They point out that converters reduce emissions of another greenhouse gas - ozone - as well as carbon mo