Welcome to Clean Air World

The National Association of Clean Air Agencies (NACAA, formerly STAPPA/ALAPCO) welcomes you to Clean Air World. Use this web site to learn about air pollution, find the latest news and information on important air topics and link to governmental air pollution control agencies around the world  

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Did You Know?

Diesel trucks and buses emitted 17% more toxic particulates and 13% more smog-forming nitrogen oxides (NOx) in 1997 than they did in 1970 when the Clean Air Act was passed. Non-road diesel sources emitted 35% more NOx and 40% more particulates in 1997 than in 1970.