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Ozone Attacks Your Heart Within Hours Of Exposure

Ozone Attacks Your Heart Within Hours Of Exposure

This summer, it’s in your best interest to pay attention to local ozone level alerts. A recent study found that just two hours of exercising during increase ozone levels can cause unfavorable changes in heart function–even in those with no history of heart disease.

The study, recently published in the journal Circulation, asked healthy, young volunteers to participate in two hours of intermittent exercise in a lab while being exposed first to “clean” air, and then to air containing 0.3 parts per million of ozone. While this level is somewhat higher than average ozone levels in most U.S. cities, it is on par with the amount of ozone a person in an average American city would be exposed to if they spent seven to eight hours outside.

Ozone is a gas composed of three atoms of oxygen. Ozone occurs both in the Earth’s upper atmosphere and at ground level. Ozone can be good or bad, depending on where it is found. Troposheric, or ground level ozone, is not emitted directly into the air, but is created by chemical reactions between oxides of nitrogen (NOx) and volatile organic compounds (VOC). Ground level ozone can be especially bad in urban areas during hot summer months.

Scientists were surprised to find that after just two short hours under the ozone conditions, participants experienced a nearly 99 percent jump in levels of interleukin-8, an marker for inflammation in the blood vessels. They also showed a 42 percent drop in plasminogen levels, which lowers the body’s ability to break up blood clots.

“This study provides a plausible explanation for the link between acute ozone exposure and death,” Robert Devlin, a senior scientist at the U.S. Environmental Protection Agency’s National Health and Environmental Effects Research Laboratory and the study’s lead author, said in a statement.

Before planning a day of outdoor fun or exercise, be sure to check the ozone levels in your area. A complete evaluation of current ozone levels in the U.S. can be found at

Related Reading:

Ozone Threats: Five Things You Need To Know

Obama Retreats On Ozone Rules

Appalachian Mountain Club Studies Ozone’s Effects On Hiker Health

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Image via Thinkstock

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5:18AM PDT on Jul 3, 2012

we hear of these wonderfully fit folk dying during exercise ....wild fit animals dying from who knows what and the larger population doesn't care - even though their children are becoming ferals ADD

4:06AM PDT on Jul 3, 2012

not cool

12:50PM PDT on Jul 2, 2012


6:14AM PDT on Jul 2, 2012

thanks for sharing..

2:23AM PDT on Jul 2, 2012

Thanks for the info.

8:55AM PDT on Jul 1, 2012

wow,awesome without ozone,what is human being? we gonna protect it or continue destroy it,is all in our hands.

11:55AM PDT on Jun 30, 2012


12:08PM PDT on Jun 28, 2012


9:08AM PDT on Jun 28, 2012


8:59AM PDT on Jun 28, 2012

Worrying! They dont mention the levels that are bad for children who are the ones who tend be be outside running around in the summer holidays. Do we have now to start checking ozone levels before we let our children outside to play?

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Parents can pass this "reality" on to their children. Thanks for sharing!

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Beth Buczynski Beth is a freelance writer and editor living in the Rocky Mountain West. So far, Beth has lived in... more
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