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Winter Smog Story Board
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Narrative: Urban air pollution can occur in winter when there is a layer of cooler air covering a city,... |
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...and a layer of warmer, windless air above. This is called temperature inversion . |
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Very small particles of smoke and pollutants, mainly from domestic heating, are discharged into the air. |
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They are trapped under the inversion layer, and over two or three days of still conditions the concentration builds up. |
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The pollution particles are so small that even rain can't wash them out of the air - only wind can disperse them. |
The contents of this page were last edited, Monday, 17 July 2006
EPA Victoria, 40 City Road, Southbank Vic 3006 |
