Wednesday, March 25, 2009

CLEAN AIR ACT



Clean Air Act


Smog over Shanghai(1993).
A Clean Air Act describes one of a number of pieces of legislation relating to the reduction of smog and air pollution in general. The use by governments to enforce clean air standards has contributed to an improvement in human health and longer life spans. Critics argue it has also sapped corporate profits and contributed to outsourcing, while defenders counter that improved environmental air quality has generated more jobs than it has eliminated.
Additionally, air quality legislation has led to widespread use of atmospheric dispersion models, including point source models, roadway air dispersion models and aircraft air pollution models in order to analyze air quality impacts of proposed major actions.

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