photochemical smog


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photochemical smog

[¦fōd·ō′kem·ə·kəl ′smäg]
(meteorology)
Chemical pollutants in the atmosphere resulting from chemical reactions involving hydrocarbons and nitrogen oxides in the presence of sunlight.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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PAN is a thermally unstable secondary photochemical smog constituent, which decomposes into peroxyethanoyl radicals and NO2.
Today, photochemical smog persists statewide, primarily because of increased use of automobiles.
Industry, cement dusts, photochemical smog cause injury, partially or complete destruction of vegetation, reduction of growth and ultimately crop yield, S[O.sub.2], N[O.sup.2], ammonia, fluorides, [O.sup.3] [Cl.sup.2], PAN are responsible for destruction, dying, burning of leaf tissues (NECROSIS) and bleaching of green chlorophyll (CHLOROSIS).
--the building in its basic variant exhibits the best environmental properties in the following categories: toxicity of substances contained in water to human and water consumption, and good properties as regards: the greenhouse effect, acidification of the environment, primary energy consumption, utilisation of minerals, waste and transport; and worse as regards reduction of ozone, photochemical smog, toxicity of airborne substances, eco-toxicity, eutrophisation,
KITAKYUSHU, Japan - A photochemical smog warning issued in Kitakyushu, Fukuoka Prefecture on Sunday forced 85 elementary schools in the city to postpone their planned athletic meets.
Now, add a blistering July sun; all the goop in the air cooks in the heat to form what the experts call photochemical smog. (Smog is a word created from combining parts of the words "smoke" and "fog".)
By far the most significant of these is formaldehyde, a known precursor to photochemical smog that can also irritate.
The effect of ozone associated with summertime photochemical smog on frequency of asthma visits to hospital emergency departments.
It's a known precursor to photochemical smog that can also irritate the eyes, nasal membranes and sometimes the skin.
But Tokai is judged the least satisfactory region overall for a new capital because Aichi and Gifu already suffer photochemical smog, which a new capital would exacerbate.
He helped initiate studies on the sources of photochemical smog and helped develop control regulations and warning procedures for Los Angeles County.

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