We visualized the damaging, tiny particles that wreak havoc on human health. From the Bay Area to New Delhi, see how the world’s worst pollution compares with your local air. The floating particles on ...

Air pollution—particulates tossed into the air from car exhaust, factory fumes, and power plants—is nasty stuff. Breathing it in causes damage to your lung tissue. It can trigger asthma attacks. It ...

To the residents of Donora, Pa., a mill town in a crook of the Monongahela River, the daily haze from nearby zinc and steel plants was the price of keeping their families fed. But on October 27, 1948, ...

Millions of people across the US and Canada experienced some of the worst air quality in the world last week as smoke from Canadian wildfires blanketed towns and cities with thick, orange smog. In New ...