News tagged with air

Related topics: air pollution , air quality , pollution

Ozone air pollution could harm women's fertility

Many urban and suburban areas have high levels of ground-level ozone, an air pollutant that can adversely affect lung and heart health. New research in mice suggests breathing high levels of ozone could also affect women's ...

Mar 30, 2015
popularity 27 comments 0

LA story: Cleaner air, healthier kids

A 20-year study finds that millennial children in Southern California breathe easier than ones who came of age in the '90s, for a reason as clear as the air in Los Angeles today.

Mar 04, 2015
popularity 4 comments 0

Hidden hazards found in green products

A University of Melbourne researcher has found that common consumer products, including those marketed as 'green', 'all-natural', 'non-toxic', and 'organic', emit a range of compounds that could harm human ...

Mar 04, 2015
popularity 17 comments 0

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