Ozone is an odorless, colorless gas that forms both in the air at ground level and in the Earth's upper atmosphere (the stratosphere).
Ground-level ozone forms when precursor pollutants that come from cars, power plants, and other sources react with each other
in heat and sunlight.
While ozone in the stratosphere creates a layer that protects us from the sun's harmful ultraviolet (UV) rays, ozone at ground
level may irritate and damage the lungs, and harm human health in other ways. The federal health-based standard for ozone
in outdoor air is 0.075 parts per million (ppm), averaged over an 8-hour period.
Ozone in Outdoor Air, Number of Days Ozone Exceeded 0.075 ppm, by County, 2010
Days (and person-days) in which the average concentration of ozone in outdoor air exceeds the regulatory standard at an ozone
How We Calculated the Rates
Number of days in a year in which the ozone concentration at a monitor exceeded the National Ambient Air Quality Standard
(NAAQS), averaged over an 8-hour period; or exceeded the NAAQS of 0.12 ppm, averaged over a 1-hour period; or number of person-days,
which is the product of the number of days with an ozone exceedance times the population of the geographic area (county) represented
by a monitor.
Page Content Updated On 06/26/12,
Published on 06/26/12
Environmental Public Health Tracking Project, New Jersey Department of Health, PO Box 369, Trenton, NJ 08625-0369, Phone: 609-826-4984, e-mail: firstname.lastname@example.org,
Department of Health
P. O. Box 360, Trenton, NJ 08625-0360
Phone: (609) 292-7837
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