When you think of the United States, perhaps things like baseball, McDonald’s, the New York Times Square, or the Grand Canyon ...

AQI or Air Quality Index is a tool to measure ... the concentration of various pollutants in the air, such as ground-level ozone, which is a harmful gas formed by the reaction of pollutants ...

Ozone is a gas comprised of three oxygen (O3) atoms. It is unstable and reacts easily to other gases. In its natural state, it is a component in several levels of the atmosphere. At high altitudes ...

Ozone is an invisible, odorless gas that can either protect us or harm us depending on where it is found. Since at least the 1950’s the United States has been monitoring and regulating the amount of ...

The Avon Lake Public Library hosts one of 17 ozone gardens in the United States, using plants to detect harmful ozone levels in the community.

Dhaka—the overcrowded capital city of Bangladesh—topped the list of cities with the worst air quality, recording an AQI score ...

Specialized air quality instruments captured a spike in lead, chlorine, and bromine pollution during the L.A. wildfires.