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The World Health Organization considers the safe daily level to be 25 micrograms per cubic meter.
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Even I noticed it last week, though, when the PM 2.5 AQI approached 900 micrograms per cubic meter.
FORBES: Air Quality In China
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And from this year, new facilities are to meet the tougher international standard of 0.1 nanograms per cubic meter.
CNN: Warning -- this garbage is dangerous
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It spews 500 nanograms of dioxin per cubic meter of fume, more than six times the Japanese safe level of 80 nanograms.
CNN: Warning -- this garbage is dangerous
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On April 29, Lincoln Center recorded the highest daily pollen level for New York since it started tracking in 2009: 5, 093 particles per cubic meter (1, 500 is considered uncomfortable).
WSJ: Sniff, Sneeze, Blow, Wipe, Repeat
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Current designs can produce two kilowatts per cubic meter of liquid reactor volume and without any drawbacks (some models produce methane as a by-product, this tech does not).
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The greater Salt Lake region had up to 130 micrograms of soot per cubic meter on Wednesday, or more than three times the federal clean-air limit, according to the U.S. Environmental Protection Agency.
NPR: Sickening Fog Settles Over Salt Lake City Area
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Raun and Ensor conclude that federal air quality standards are adequate where ozone levels are concerned (at 75 parts per billion), but that lives would be saved if particulate matter standards were tightened below the current level of 35 micrograms per cubic meter of air.
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Saturday saw the density of PM2.5 air particles smaller than 2.5 microns and able to enter the lungs and even the blood stream climb higher than 900 micrograms per cubic meter in several districts in the capital, according to the Beijing Municipal Environmental Monitoring Center.
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Common metrics of power density include: horsepower per cubic inch, watts per square meter and watts per kilogram.
FORBES: Magazine Article