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This is a term used to describe a mixture of smoke and
fog. Smog occurs when high concentrations of moisture is combined with
smoke (often containing oxides of sulfur and nitrogen) in the presence of
high temperatures or thermal inversions and the absence of wind. These
conditions cause polluted air to stagnate over industrial areas and can
create a respiratory health hazard. Large coastal industrial centers with
surrounding high ground are more prone to smog. There is often a
diurnal (over a day) variation in the process of smog formation
because one of the necessary components for its formation is sunlight.
[Journal of Environmental Health; v56; p38; 1994.] [Science News; v144;
p326; 1993.]
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