The World Health Organization (WHO) adopted a dose-response function for PM2.5 that lumps outdoor ambient air quality, second-hand (passive) smoking, and indoor household air pollution. It has been used in 80 published studies of the “Global Burden of Health” (GBD). Here I take a closer look and incorporate some additional risk estimates.
The global mortality rate from air pollution is estimated to be 8.8 million people per year. That's 18% higher than the 7.2 million lost annually from tobacco. Do you believe it? There is room for doubt. Let's take a look.