This study examines the effects of air quality regulation on
economic activity. Anecdotal evidence and some recent empirical studies
suggest that an inverse relationship exists between the stringency of
environmental regulations and new plant formations. Using a unique
county-level data set for New York State from 1980 to 1990, we revisit
this conjecture using a seminonparametric method based on propensity
score matching. Our empirical estimates suggest that pollution-intensive
plants are responding to environmental regulations; more importantly, we
find that traditional parametric methods used in previous studies may
dramatically understate the impact of more stringent regulations.