The EPA's Air Quality Index can tell you whether breathing outside air can be harmful. Here's how to read the scale to plan ...

The air quality index in Aspen was expected to stay at moderate levels throughout Wednesday and part of Thursday, thanks in part to thunderstorms blowing smoke erratically from the fires burning in ...

Residents across much of the Hudson Valley, Long Island, and New York City are under dual weather alerts on Wednesday, July ...

Sensitive groups are advised to stay indoors and limit outdoor activities as pollution and ozone levels spike to unhealthy ...