Anchor: Across-study variation refers to the fact that different published studies of the same pollutant/health effect relationship typically do not report identical findings
Entailed: The variation refers to the fact that different studies of the same pollutant don't have the same results.
Contradiction: Every study about pollutants shows exactly the same outcomes.
Contradiction: The man is hangliding.
Contradiction: Two players are playing soccer.
Contradiction: A crowd is in class.
Contradiction: A lot of special-interest tours are available.