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What is the reason behind the yellow colour of smog?

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What is the reason behind the yellow colour of smog?

(a) Nitrogen dioxide

(b) Sulphur dioxide

(c) Sulphate ions

(d) Nitrate ions

I have been asked this question by my school teacher while I was bunking the class.

This question is from Particulates topic in division Particulates, Acid Rain & Aerosols of Environmental Engineering

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The correct choice is (c) Sulphate ions

The explanation is: Sulphate ions formed by the conversion of sulphur dioxide due to high humidity and low temperature, is responsible for the yellow colour of smog.

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