Local officials say they are working to understand the reasons behind the recent rise in ozone levels and to find solutions to improve air quality. U.S. Sen. Mark Kelly, D-Ariz., is advocating for ...

The researchers studied heart attack occurrence alongside concurrent levels of ozone and PM2.5 (airborne particles with a diameter of 2.5 micrometers or smaller) near the patients' homes.

Use this chart to find out Droughts also make forest ... protecting the Earth from the sun's ultraviolet rays. But at ground level, ozone is the main ingredient of smog and a harmful pollutant ...