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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.]
    Source: Atmospheric Chemistry Glossary
  • Air pollution typically associated with oxidants. (See photochemical smog.)
    Source: Terms of the Environment

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