Learn what the air quality index (AQI) means, how it impacts your health, and how to stay safe when pollution is high.

If you have been hearing about poor air quality in New York City Friday, you can breathe a deep sigh of relief (literally): ...

If you think something seems off with the air quality today in New York City, you're not wrong. But what's causing it? One ...

Those groups particularly sensitive to particulate matter in the air may want to limit time outside Friday and Saturday.

A wildfire erupted near Castaic Lake Wednesday, sending plumes of smoke into neighboring Ventura County areas. Here's what to ...

Wear a tight-fitting N95 mask at the bare minimum, but a P100 is better, experts say. Wear long sleeves, eye protection, closed-toed shoes and cut-resistant gloves. Clean or decontaminate anything ...

But air quality can vary on a hyperlocal scale, meaning the network of official sites is "fairly ... What doesn't AQI tell us ...