Almost half of everyone who lives in the United States breathes unhealthy levels of air pollution, according to the American Lung Association’s annual State of the Air report, released Wednesday.

A new interactive map and groundbreaking database allows people in the world’s largest metropolitan areas to track their air pollution exposure, along with their region’s biggest sources of ...

Electric vehicles are rapidly cutting tailpipe emissions in cities that once choked on exhaust, but the shift to battery-powered transport is also exposing a quieter, less visible form of pollution.

The facility, in Colstrip, Mont., used a new E.P.A. system for requesting special waivers from President Trump. By Hiroko Tabuchi The nation’s most polluting coal-burning power plant has asked ...

This story was reported and written by Tiffany Cusaac-Smith, Mercedes Hamilton and Arielle Martinez. As a child in New Cassel, Darinel Velasquez wondered if it was normal to grow up close to so many ...

ProPublica is a nonprofit newsroom that investigates abuses of power. Sign up to receive our biggest stories as soon as they’re published. These highlights were written by the reporters and editors ...