Research Spotlight: Ozone recovery and climate change will affect the atmosphere near Earth's surface


  • Mohi Kumar,

  • Ernie Tretkoff


Ozone in the stratosphere (∼10–50 kilometers in altitude) helps protect life on Earth from harmful solar ultraviolet radiation. But at the lower altitudes in the troposphere, (0–10 kilometers in altitude), ozone is a major constituent of smog and has detrimental health effects. The stratospheric ozone layer had been depleted but recently has started to recover due to efforts to limit emissions of ozone- depleting chemicals.