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

The AQI incorporates measurements of five different air pollutants that the Environmental Protection Agency regulates: fine particles, ozone, carbon monoxide, sulfur dioxide, and nitrogen dioxide.

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

Carbon monoxide is a colorless, odorless, tasteless gas that can accumulate in homes and kill without warning.

Cyclists and teams can no longer use carbon monoxide gas outside of a medical facility, the sport's governing body International Cycling Union (UCI) said.

Cycling’s governing body has banned the repeated use of carbon monoxide rebreathing that some riders misuse to artificially increase their performances.

LewisGale-Allegheny has sectioned off an area in the hospital to reserve for students and parents who are testing for carbon monoxide levels.