United Press International: Air pollution contributes to more than 2 million premature deaths globally each year, according to new research published Friday in the journal Environmental Research Letters.
That number is much smaller than some previous estimates, which put the number around 3 million.
Scientists used mathematical models to estimate the effects of fine particulate matter, such as soot, and ozone, the main component of smog.
West and his colleagues concluded that about 470,000 people die each year from...