(Posted May 18, 2012, at 11:15 a.m.) The Arizona Department of Environmental Quality (ADEQ) has extended the Ozone Health Watch issued for Saturday, May 19 and an Ozone High Pollution Advisory issued for Sunday, May 20 for areas within and bordering Maricopa County.

ADEQ issues a Health Watch when the highest concentration of ozone or particulate matter levels may approach the federal health standard.

People with respiratory or other health problems that make them more sensitive to air pollution are advised to limit their outdoor activity.

Resources

• Effects of Common Air Pollutants
• Ozone Fact Sheet
• Good and Bad Ozone
• Particulate Matter Fact Sheet
• Environmental Protection Agency (EPA) Ozone brochure

(Source: Arizona Department of Environmental Quality)