A state board recently voted unanimously to create long-awaited indoor heat standards for California workers. After a final legal review, that will mean protections for millions of people with jobs in warehouses, kitchens ...
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The numbers are staggering. In what the National Weather Service has described as a "never-ending heat wave," records continued to fall across the West this week: 120 degrees Farenheit (49 degrees Celsius) in Las Vegas; a ...
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Cornell researchers have created a web tool that estimates county-by-county mortality from wildfire smoke in real time, to help local emergency managers assess the magnitude of the danger.
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Childhood obesity is a growing global public health concern, significantly increasing the risk of various health issues later in life. Factors contributing to obesity include genetic, socioeconomic, behavioral, and environmental ...
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New research published in Arthritis & Rheumatology indicates that chronic exposure to air pollutants may increase the risk of developing lupus, an autoimmune disease that affects multiple organs.
Jul 10, 2024
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When wildfires rage, the immediate threat is obvious—but smoke from the fires actually kills far more people than the flames.
Jul 8, 2024
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Californians are staring down an unusually long and dangerous heat wave. Public health officials are opening cooling centers and urging caution as folks head out to celebrate the Fourth of July in what the National Weather ...
Jul 4, 2024
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More than seven percent of all deaths in 10 of India's biggest cities are linked to air pollution, a large study said Thursday, leading researchers to call for action to save tens of thousands of lives a year.
Jul 4, 2024
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Twenty-seven of every 1,000 babies and children die due to exposure to dirty cooking fuels in India, where air pollution is among the worst in the world, according to new Cornell research.
Jul 1, 2024
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Long-term exposure to air pollution can lead to a loss of independence for older adults, according to a University of Michigan study.
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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
