Air Pollution | Air Quality Has Improved
In accordance with the 1990 Clean Air Act, the U.S. Environmental Protection Agency (EPA) monitors emissions and sets standards for air pollutants. EPA data show that from 1983 to 2000, concentrations of the six principle air pollutants—nitrogen dioxide, ozone, sulfur dioxide, particulate matter, carbon monoxide, and lead—all decreased. Levels of acid rain and other toxic air pollutants such as benzene also declined. As a result of the implementation of a number of air pollution prevention programs, air quality in the United States has improved significantly and will...
[The entire page is 3163 words long]
