November 2001

Trends and Resources

HP In Brief: HPIn Brief

U.S. air quality steadily improved through 2000, according to EPA's annual summary of air quality trends (www.epa.gov). This trend toward cleaner air has continued since EPA's formation in 1970, whil..

Weirauch, Wendy, Hydrocarbon Processing Staff

U.S. air quality steadily improved through 2000, according to EPA's annual summary of air quality trends (www.epa.gov). This trend toward cleaner air has continued since EPA's formation in 1970, while during the same time there were increases in the GDP of 158%, miles traveled by cars and trucks of 143% and energy consumption of 45%. The report data show the following air quality trends from 1991 – 2000 for the six major national air pollutants regulated by EPA under the Clean Air Act: lead concentrations decreased 50%; carbon monoxide concentrations down 41%; sulfur dioxide concentrations decreased 37%; particulate matter concentrations down 19%; nitrogen dioxide concentrations decr

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