News tagged with air

Related topics: air pollution , air quality , pollution

Air quality and its impact on transplants

As Civil and Environmental Engineering Professor Jamie Schauer travels around the world studying air pollution, he tenaciously reminds people that pollution is a human health issue. That is especially crucial when it comes ...

Dec 11, 2014
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Possible link between air pollution and breast cancer

A new study of over 3,400 Canadian women provides further evidence that exposure to air-pollution may increase the risk of developing breast cancer, especially among women who have not yet had their menopause.

Dec 08, 2014
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Traffic jams can hurt the heart

Anyone who has experienced Los Angeles gridlock likely can attest that traffic may cause one's blood pressure to rise. But UC Irvine researchers have found that, beyond the aggravation caused by fellow drivers, ...

Dec 02, 2014
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Earth's atmosphere

The Earth's atmosphere is a layer of gases surrounding the planet Earth that is retained by the Earth's gravity. It has a mass of about five quadrillion metric tons. Dry air contains roughly (by volume) 78.08% nitrogen, 20.95% oxygen, 0.93% argon, 0.038% carbon dioxide, and trace amounts of other gases. Air also contains a variable amount of water vapor, on average around 1%. The atmosphere protects life on Earth by absorbing ultraviolet solar radiation, warming the surface through heat retention (greenhouse effect), and reducing temperature extremes between day and night.

There is no definite boundary between the atmosphere and outer space. It slowly becomes thinner and fades into space. An altitude of 120 km (75 mi) marks the boundary where atmospheric effects become noticeable during atmospheric reentry. The Kármán line, at 100 km (62 mi), is also frequently regarded as the boundary between atmosphere and outer space. Three quarters of the atmosphere's mass is within 11 km (6.8 mi; 36,000 ft) of the surface.

This text uses material from Wikipedia licensed under CC BY-SA