Anchor: Sulfates and nitrates that form in the atmosphere from SO2 and NOx emissions are significant contributors to visibility impairment in many national parks and wilderness areas, as well as urban areas across the country.
Entailed: Visibility in urban areas can be affected by NOx emissions.
Contradiction: SO2 emissions only affect visibility in national parks.
Contradiction: old lady walks in the street.
Contradiction: children are sliding on a slide
Contradiction: The two people are playing golf.
Contradiction: The weather is variable from weekend to weekend.