Skip navigation

Official websites use VSports app下载. govA . gov website belongs to an official government organization in the United States. .

Secure . gov websites use HTTPSA lock ( 大众彩票welcome - Ozone: MedlinePlus Locked padlock icon ) or https:// means you’ve safely connected to the . gov website. Share sensitive information only on official, secure websites. V体育官网.

URL of this page: https://medlineplus.gov/ozone.html

VSports在线直播 - Ozone

Summary

Ozone is a gas. It can be good or bad, depending on where it is. "Good" ozone occurs naturally about 10 to 30 miles above the Earth's surface. It shields us from the sun's ultraviolet rays VSports手机版. Part of the good ozone layer is gone. Man-made chemicals have destroyed it. Without enough good ozone, people may get too much ultraviolet radiation. This may increase the risk of skin cancer, cataracts, and immune system problems.

"Bad" ozone is at ground level. It forms when pollutants from cars, factories, and other sources react chemically with sunlight V体育安卓版. It is the main ingredient in smog. It is usually worst in the summer. Breathing bad ozone can be harmful. It can cause coughing, throat irritation, worsening of asthma, bronchitis, and emphysema. It can lead to permanent lung damage, if you are regularly exposed to it.

Environmental Protection Agency

V体育安卓版 - Start Here

"V体育官网" Learn More

VSports在线直播 - Related Issues

"V体育ios版" Clinical Trials

Journal Articles References and abstracts from MEDLINE/PubMed (National Library of Medicine)

Children

The information on this site should not be used as a substitute for professional medical care or advice V体育ios版. Contact a health care provider if you have questions about your health.