In Air Quality
One measure of air pollution used in air quality standards is the atmospheric concentration of particulate matter. This measure is also sometimes referred to as the "particle number", although it is usually expressed in μg/m3 (micrograms per cubic metre).
Read more about this topic: Particle Number
Famous quotes containing the words air and/or quality:
“The air of one’s native country is the most healthy air.”
—Anton Pavlovich Chekhov (1860–1904)
“I have every characteristic of a night person—a distaste for bosses, a hatred of the expected, an obsession with gaining an ultimately nonexistent freedom—every quality except one. I can’t stay awake after a while. I fall asleep.”
—John Bowers (b. 1928)
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