Question

How does pollution lead to colouration of the skin?

Answer 1

The pollutant greenhouse gases  in the atmosphere trap in more of the UV rays of the sun, and UV rays makes the skin produce more Melanin(which protects the skin against skin Cancers resulting from exposure to UV Rays)and, thus result in skin tanning. 

Answer 2

Answer:

The pollutent greenhouse gases in the atmosphere trap in more of the UV rays

of the sun, and UV rays makes the skin

produce more melanin (which protects the skin against skin cancers resulting from exposure to UV rays) and, thus result in skin tanning.

Explanation:

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