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What is photo chemical somg? How does so...

What is photo chemical somg? How does somg effect the biological world?

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photochemical somg is yellowish brown somg which is formed under oxidising conditions and high temperature ove rcities and towns. It contins large amount of NO2 and unburnt hydrcarbon, it causes respiratory rpoblem like asthma and bronchitis and in plants it causes silvering glazing and nercrosis of leaves.
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