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The methods that EPA introduced after 1970 to reduce air-pollutant emissions worked for a while, but over time have become progressively less effective.

Barry Commoner
Air, Epa, Method
Interview With Alan Hall, www.scientificamerican.com. June 23, 1997.
The methods that EPA introduced after 1970 to reduce air-pollutant emissions worked for a while, but over time have become progressively less effective.