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The Healthy @Reader's Digest on MSN8 Things Your Mucus Says About Your HealthIf your mucus is gray or black... …you likely inhaled dark-colored particles, like smoke from a fire or heavy exhaust.
When a person has black or dark-colored mucus, they may have inhaled potentially harmful pollutants. Coughing up black mucus may also be due to an underlying infection or condition. Mucus serves ...
Julia Calderone wrote an earlier version of this post.
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