News tagged with air

Related topics: air pollution · air quality · pollution

Risk of heat-related health problems increases with age

With summer here and the temperatures rising, it is important to understand the health risks that excessive heat can bring and know the signs of heat-related illnesses. Older adults and people with chronic medical conditions ...

Jul 14, 2017
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Are the chemicals we encounter every day making us sick?

When her kids were young, Tracey Woodruff, PhD, MPH, knew more than most people about environmental toxics. After all, she was a senior scientist at the Environmental Protection Agency (EPA). But even she never dreamed, as ...

Jun 23, 2017
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Extreme heat in southwest a deadly threat

(HealthDay)—With temperatures soaring so high that some planes couldn't take off in Phoenix on Tuesday, the heat wave scorching the Southwest for the next week should be taken very seriously, one emergency doctor warns.

Jun 21, 2017
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Airborne bacteria remain live for 45 minutes

Cover your mouth when sneezing or coughing and wash your hands. QUT and UQ scientists have developed a new technique to study how some common disease causing bacteria can spread up to 4m and remain alive in the air for up ...

Jun 19, 2017
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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

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