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| The Definition of Smog has been modified over time: * The very first definition of the term was created by Dr. Harold deVoeux, in 1911: smog is a combination of coal smoke and fog, where particles of smoke may serve as the locations on which water vapor condenses (resembles today�s definition of an industrial smog). * After 1911 and before late 1940�s, the term smog was used to designate any type of polluted atmosphere. * In later 1940�s and early 1950�s a unique type of polluted atmosphere has been recognized and named - photochemical smog. |
| The Definition of Smog |
| Present-day definition of the term Smog: * General Definition: Smog is a term referring to forms of air pollution in which atmospheric visibility is partially obscured by a haze, consisting of solid particulate matter and liquid aerosols. * More Specifically: Contemporary scientists distinguish between two main and well-defined types of smog. These are: 1. Industrial Smog 2. Photochemical Smog |
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