Assertion: acid rain's acid | /r/CapableOf | join with other chemicals
Facets:
value: to produce urban smog
type: PURPOSE
value: in the air
type: LOCATION
Source sentences:
text: In the air, acids join with other chemicals to produce urban smog, which can irritate the lungs and make breathing difficult, especially for people who already have asthma, bronchitis, or other respiratory diseases.