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प्रश्न
What is photochemical smog composed of?
अति संक्षिप्त उत्तर
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उत्तर
Photochemical smog is composed of ozone (O3), nitrogen oxides (NOx), PAN (peroxyacetyl nitrate), aldehydes, and unreacted hydrocarbons formed by the action of sunlight on automobile exhaust gases.
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