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  1. Clearing the Air | Science - AAAS

  2. Air pollution | Effects, Causes, Definition, & Facts | Britannica

  3. Toward cleaner air and better health: Current state ... - Science

  4. Unexpected air pollution with marked emission reductions ... - Science

  5. Air Pollution Solutions - Center for Science Education

  6. Air Pollution News -- ScienceDaily

  7. Air Pollution and Your Health - National Institute of …

  8. Effects of Air Pollution - Center for Science Education

  9. Air Pollution Threatens Millions of Lives. Now the Sources Are …

  10. Air pollution - World Health Organization (WHO)