Assertion: air pollution's effect | /r/HasProperty | negative
Facets:
value: very
type: DEGREE
value: with wide confidence limits
type: OTHER
Source sentences:
text: The third data set comprised annual cross-sectional relationships among 151 U.S. metropolitan areas for which the effect was negative with wide confidence limits, presumably because of the difficulty of controlling for the many potentially confounding variables in long-term spatial analyses.
text: The effects of these laws have been very positive.