In a world of increasing wildfires and invisible irritants, we consulted experts to explain how to measure and correct air quality.

How is air quality across the U.S. these days? -- Paul Jackson, Washington Answer: Air quality is defined as the degree to ...

What is the Air Quality Index? The Air Quality Index is used nationwide to measure the severity of air pollution and categorize the health risks that are involved with various levels of pollution.

Dry weather and increased outdoor activities pose a risk to the Lower Hudson Valley and other areas with possible threats of ...

A gray haze from wildfire smoke could be seen in Cincinnati, and the entire state of Minnesota is under an air quality alert.

Air quality can become an issue when wildfires spark across the U.S. and Canada or when densely populated areas use a lot of fossil fuels. Let's talk about how scientists measure air quality.

Smoke from more than 100 wildfires blazing in Canada is expected to spread to impact air quality in more U.S. state.

The AQI (Air Quality Index) indicates the quality of air in a particular city. The quality of air is affected by various factors, it measures between 0 to 500. How is it calculated?

Smoke from more than 100 wildfires blazing in Canada is expected to spread and impact air quality index in Minnesota.

A hidden air pollutant is discovered by Caltech scientists that may change the way smog is studied in Southern California ...