Assertion: secondary aerosol | /r/CapableOf | take the form of ammonium salts
Facets:
value: in the presence of ammonia
type: OTHER
value: often
type: TEMPORAL
Source sentences:
text: In the presence of ammonia, secondary aerosols often take the form of ammonium salts; i.e. ammonium sulfate and ammonium nitrate (both can be dry or in aqueous solution); in the absence of ammonia, secondary compounds take an acidic form as sulfuric acid (liquid aerosol droplets) and nitric acid (atmospheric gas), all of which may contribute to the health effects of particulates.