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Posted on January 24,2022 at 01:28 PM by Chitra LR
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no imageWHAT IS PAN AND ITS EFFECT ?
Photochemical smog is a brownish-gray haze caused by the action of solar ultraviolet radiation on atmosphere polluted with hydrocarbons and oxides of nitrogen. It contains anthropogenic air pollutants, mainly ozone, nitric acid, and organic compounds, which are trapped near the ground by temperature inversion. These pollutants and also some others can affect human health and cause damage to plants. Photochemical smog often has an unpleasant odor due to some of its gaseous components. The term smog (not to be confused with photochemical smog) is commonly used to represent a near-ground haze made of a combination of smoke and fog rather than ozone, nitric acid, and organic compounds.
PANs have many adverse effects in the human body such as reduced respiratory function (including emphysema and impaired breathing) and eye irritation. Human exposure to PANs typically occurs in urban centers where automobile and industrial emissions are high.
PANs can remain in the atmosphere for about 3 months after formation, under cold conditions (-20°C and lower). However, in warmer areas, PANs persist only for a few hours. PANs that remain suspended in the atmosphere for extended periods of time are of concern, since they can be transported large distances by wind currents, thereby spreading their impact to other regions. Under these conditions, PANs can contribute to air pollution in places far away from their source.

Posted on January 24,2022 at 12:25 PM by RAHUL VERMA
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