The data that goes into the Air Quality Index comes from 5,000 air monitors across the country, including local, state, tribal, and federal reporting.

Another air quality alert is in effect Tuesday for NYC, western Long Island, the Hudson Valley, northwest New Jersey and ...

What is the Air Quality Index? The Environmental Protection Agency breaks down the six different air quality categories on its AQI website. "Think of the AQI as a yardstick that runs from 0 to 500.

A measure called the Air Quality Index gauges just how bad the air has become in a particular place. Readings of 100 or higher usually serve as a warning to people who have respiratory conditions ...

When the AQI index reaches 301 or higher, the air quality is "hazardous" and is a health warning of emergency conditions, as everyone is more likely to be affected.

Due to smoke from Canadian wildfires, the air quality index over much of eastern Pennsylvania was in the “orange” range ...

Close the windows and turn on the air conditioner, if you have one, setting it to circulate the indoor air. Use blankets to ...

Heat and poor air quality are becoming chronic problems. Here’s what Boston is doing to adapt. But first, here’s what else is ...

Thursday, Detroit had the worst air quality in the world, according to AQI rankings and Friday was remained in the red or "unhealthy" category. There are nearly 500 active wildfires in Canada, and ...

How do I check the air quality in Phoenix? There are a few ways to check Phoenix's air quality that are simple and easy. You don't have to look at a full index if you don't want to.

Some regions of Louisiana are known for having the worst air quality, but other areas are said to have the best. Here's where ...

Poor air quality may be causing your skin irritation and itchy, dry throat. And with the nearly record-breaking summer heat set to continue at least through Labor Day, you'll need to understand ...