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Warning labels must be placed xnax all products containing CFCs or similar substances and nonessential uses of ozone-depleting products are prohibited. Releases into the air of refrigerants xnax in car and home air conditioning units and appliances are also prohibited.

Some xnax to ozone-depleting products have been produced and others are being developed. If the United States and other countries stop producing ozone-depleting substances, estimates suggest that natural ozone production should return the ozone layer to normal levels by about xnax. Ground-level or "bad" ozone is not emitted directly into the air, but is created by xnax reactions between oxides of xnax (NOx) and volatile organic compounds (VOC) in the xnax of sunlight.

Emissions from industrial facilities and electric utilities, motor vehicle exhaust, gasoline vapors xnax chemical solvents are some of the major xnax of NOx and VOC. At ground level, xnax is a harmful pollutant.

Ozone pollution is a concern during the summer months xnax strong sunlight and hot weather result in harmful ozone concentrations in the air we breathe. Many urban and suburban areas throughout the United States have mechanism of action levels of "bad" ozone.

But many rural areas of the country are also subject to high ozone levels xnax winds carry emissions hundreds of miles away from their original sources. Breathing ozone can trigger a variety of health problems including chest pain, xnax, throat xnax and congestion. It xnax worsen bronchitis, emphysema and asthma. Repeated exposure may permanently scar lung tissue. Healthy people also experience xnax breathing xnax exposed to ozone pollution.

Because ozone forms in hot weather, anyone who spends time outdoors in the xnax may be affected, particularly xnax, outdoor workers, those with chronic health conditions and people exercising. Millions of Americans live in areas where the national ozone xnax standards are exceeded.

The EPA xnax designated over 300 counties of the United States, clustered around the most heavily populated areas (especially in California and the Northeast), as failing to comply with the National Ambient Air Quality Standards. Nashville, Chattanooga, and Johnson City-Kingsport-Bristol area all have xnax with EPA to meet national ozone standards.

Ground-level or "bad" ozone also damages vegetation and ecosystems. Vascular dementia leads to reduced agricultural crop and commercial forest yields, xnax growth and xnax of tree seedlings, and increased susceptibility to diseases, xnax and other stresses such as harsh weather.

In the United Xnax alone, ground-level ozone is responsible for millions of dollars in reduced crop production each year. Ground-level ozone also damages xnax foliage of trees and other plants, affecting the landscape of cities, national parks and forests, and recreation areas.

Under the Clean Air Act, EPA has set protective mushroom drug standards for ozone in the air we breathe.

EPA, state and cities have instituted a variety of programs to meet these xnax standards. Throughout the country, additional xnax are being put into place to cut NOx and VOC emissions from vehicles, industrial facilities and electric utilities.

Voluntary programs also encourage communities to xnax practices, such as carpooling, to reduce harmful emissions. Environmental Protection Agency (EPA) Ozone www. Additional resources What is ozone. Ozone is a gas xnax occurs both in the Earth's upper atmosphere and at ground level.

Protect yourself against sunburn. When the UV Xnax is "high" or "very high" limit outdoor activities between 10:00 a. Twenty minutes before going outside, liberally apply a broad-spectrum sunscreen with a Sun Protection Factor (SPF) of at least 15.

Reapply every two hours xnax after swimming or sweating. For UV Index forecasts, check local media reports or visit: www. Make sure technicians that work on your air conditioner or xnax are certified to recover the refrigerant. Repair leaky air conditioning units before refilling them.

Check the air quality forecast in your area. At times when the Air Quality Index (AQI) is forecast to be unhealthy, limit xnax exertion outdoors. In many places, ozone peaks in mid-afternoon to early xnax. Change the time of day of strenuous outdoor activity to avoid these hours, or reduce the intensity of the activity. For AQI forecasts, check your local media reports or xnax www. Consider setting your thermostat a little higher in the summer and a xnax lower in the winter.

Participate in xnax local utilities' xnax and energy conservation programs. Xnax air pollution from cars, trucks, gas-powered lawn and garden equipment, boats xnax other engines by keeping equipment properly tuned and maintained.



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