| http://www.w3.org/ns/prov#value | - In the summer of 1991 an eclectic group from the petroleum industry, the ethanol industry, government agencies, and environmental groups all sat down to hammer out new regulations required by the 1990 amendments to the Clean Air Act, setting stricter standards for automobile emissions of Carbon Monoxide and two types of emissions that cause smog: nitrogen oxide (NOx) and hydrocarbons.
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