Scientists have developed a way to detect tiny amounts of hard-to-detect explosives more than eight feet away, reducing the need to swipe clothing, luggage or other materials.
Analytical Chemistry
26 minutes ago
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0
More than 120 people died of heatstroke in the Tokyo metropolitan area in July, when the nation's average temperature hit record highs and heat warnings were in effect much of the month, Japanese authorities said Tuesday.
Environment
56 minutes ago
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In 2023, roughly 60,000 firework shells exploded above Manhattan's East River as part of Macy's Fourth of July show. The resulting air pollutant levels were many times higher in the hours after the display than those seen ...
Environment
1 hour ago
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For the first time, NASA data about nitrogen dioxide (NO2), a harmful air pollutant, is available on the Environmental Protection Agency's (EPA) widely used Environmental Justice Screening and Mapping Tool (EJScreen). This ...
Environment
3 hours ago
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6
Atmospheric nitrogen dioxide is a harmful pollutant with significant impacts on air quality, climate and the biosphere. Although satellites have mapped nitrogen dioxide concentrations since the 1990s, their resolution was ...
Earth Sciences
Aug 5, 2024
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139
Australia's south and east have seen freezing temperatures and wild weather this winter. At the same time, the continent as a whole—and the globe—have continued to warm.
Environment
Aug 5, 2024
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The failure to co-ordinate legal, policy and scientific thinking risks "a squandering of opportunity" to improve air quality, concludes new environmental law research, co-led by a UCL academic.
Environment
Aug 5, 2024
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2
Mountain hikes are invigorating. Crisp air and clear views can refresh the soul, but thin air presents an additional challenge for high-altitude birds. "All else being equal, bird wings produce less lift in low density air," ...
Plants & Animals
Aug 1, 2024
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15
Wildfire blowups, fire whirls, towering thunderstorms: When fires get large and hot enough, they can actually create their own weather.
Environment
Aug 1, 2024
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18
As global temperatures continue to rise, India is grappling with increasingly severe heat waves. As early as April, many Indian cities, including New Delhi, the capital, have experienced record temperatures above 115 degrees ...
Earth Sciences
Aug 1, 2024
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67
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
