Assertion: mucus | /r/CapableOf | turn brown
Facets:
value: because of heavy air pollution
type: CAUSE
Source sentences:
text: Mucus on poop can turn brown because it is old blood from the upper gastrointestinal tract.5
text: Though less common, it's also possible for your mucus to turn pink, red, brown, orange, or black.
text: Mucus can also turn brown or orange if you inhale something like dirt, a red spice such as paprika, or tobacco (snuff).
text: Mucus can also turn brown because of heavy air pollution.