Skip Navigation
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.


The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Your Environment. Your Health.


Back to List


Children Who Play Outdoors More Likely to Develop Asthma

children playing soccer outdoors

An NIEHS-funded study of children’s health and asthma showed that children who play an abundance of outdoor sports in areas where ozone levels are high may be three times more likely to develop asthma than children who do not take part in outdoor sporting activities. Researchers found there was no increased risk in areas where the ozone levels were low.

Tags: children's health


McConnell R, Berhane K, Gilliland F, London SJ, Islam T, Gauderman WJ, Avol E, Margolis HG, Peters JM. 2002. Asthma in exercising children exposed to ozone: a cohort study. Lancet. 359(9304):386-391. Abstract

More Information:

NIEHS Research Funding:

NIEHS Programs:

News Releases:

  • 2010: NIH Institutes Renew Dedication to Asthma Prevention, Diagnosis, and Treatment
  • 2008: Increased Allergen Levels in Homes Linked to Asthma
  • 2007: New National Study Links Asthma to Allergies
  • 2002: Multi-Sports in Ozone May Raise Asthma Risk
  • 2002: Cat Exposure Can Protect from Asthma - But There's an Exception: It Increases Asthma Risk for Children of Asthmatic Mothers

Health Information:


to Top