UN University: Ontario wildfire smoke in mid-July exposed North Americans to unhealthy air for 106 million person-days in just three days - EurekAlert!
Climate change could make unhealthy air a routine reality by 2100 - EurekAlert!
Nearly Half of Americans Are Breathing Unhealthy Air as Pollution Exposure Numbers Reach Decade High
Almost Half of Americans Breathe Unhealthy Air, Report Finds
