Among the following, which one causes more indoor chemical pollution?

Burning coal

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Burning cooking gas

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Burning mosquito coil

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Room spray

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Solution

The correct option is A Burning coal
Burning coal is the cause of major indoor chemical pollution. It releases carbon monooxide by reaction of the coals released carbon and atmospheric oxygen which is harmful to human health. Coal usually produces a lot of smoke. So, when burning indoor it creates a lot of chemical pollution.

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