Updated WHO global air quality guidelines
I never truly appreciated how valuable good air is until I moved to Asia and experienced weeks at a time living in air with AQIs over 100 and namely high PM2.5 levels.<p>The physical effects of spending even an hour outside are immediately apparent and scary when I contemplate what this would probably do to my health if I rack up years of exposure. It's even scarier to think about children who are exposed to this air from birth and grow up inhaling it every time they walk to school, go outside to play, etc.