Health

Links between COVID-19 and air pollution

Growing evidence points to a link between air pollution and increased vulnerability to COVID-19. At the same time, the U.S. Environmental Protection Agency (EPA) recently proposed doing away with a longstanding practice of ...

Diseases, Conditions, Syndromes

EU reopens its borders to 14 nations but not to US tourists

The European Union will reopen its borders to travelers from 14 countries, and possibly China soon, the bloc announced Tuesday, but most Americans have been refused entry for at least another two weeks due to soaring coronavirus ...

Diseases, Conditions, Syndromes

Air conditioning may be factor in COVID-19 spread in the South

Drawing on insights from another deadly airborne disease, tuberculosis, a Harvard infectious disease expert suggested Friday that air conditioning use across the southern U.S. may be a factor in spiking COVID-19 cases and ...

Medical research

Air pollution could help London transport planners fight COVID-19

Measuring air quality across London could help fight COVID-19 by providing a rapid means of deciding whether to reduce public transport movement—given strong links between exposure to air pollution and COVID-19 transmission, ...

Diseases, Conditions, Syndromes

Asymptomatic COVID-19 patients also contaminate the environment

Both symptomatic and asymptomatic COVID-19 patients have the capability of contaminating their surroundings, according to a new study published in mSphere, an open-access journal of the American Society for Microbiology. ...

Diseases, Conditions, Syndromes

Abattoir's cooling system helped spread virus: German expert

The air cooling system used in a German slaughterhouse helped spread the coronavirus among hundreds of workers, a hygiene expert said Wednesday, a day after the mass outbreak triggered renewed lockdowns in the area.

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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