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There is a condition called "Black Lung" which is common in coal miners. When they are in the mines they breathe coal dust and over time, the coal makes their lungs black.

An article in the 1980's stated that in California, if you live within a quarter mile of a major freeway for 20 years, your lungs will look like you were a one-pack-per-day smoker for 5 years....so smoking and breathing smog can also cause lungs to be black.

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Q: Why might lungs look black?
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