This story appears in the October 2018 issue of National Geographic magazine. Air pollution kills seven million people a year. Two of the chief contributors are lax vehicle emissions standards and ...

Pollution can affect everything from the water we drink to the air we breathe. Test how much you know about the contaminants in the environment with this quiz.

Newborns exposed to higher levels of NO2 have a 30-35% higher risk of NICU admission and an 11-22% increased risk associated ...