Here's a clue: the largest source of toxic air pollution in the nation is our fleet of coal - fired power plants. (treehugger.com)
The nation continues to face serious air pollution challenges, with large areas of the country out of attainment with air - quality standards and many communities facing the threat of toxic air pollution. (treehugger.com)
The groups involved claimed that local authorities and states were obliged to do more to protect people's health from toxic air pollution. (climateactionprogramme.org)