Here's a clue: the largest source of toxic air pollution in the nation is our fleet of coal - fired power plants. (treehugger.com)
Rising temperatures will not only damage heat - sensitive crops — they'll also increase toxic air pollution, which will harm crops even further. (ibtimes.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)