Long-Run Pollution Exposure and Adult Mortality: Evidence from the Acid Rain Program
Alan Barreca (),
Matthew Neidell () and
Nicholas Sanders ()
No 23524, NBER Working Papers from National Bureau of Economic Research, Inc
Though over 90 percent of benefits from environmental quality improvements are attributed to long-term exposure, nearly all quasi-experimental evidence on the effects of pollution on health exploits changes in short-term exposure. Quantifying long-run exposure impacts requires a lasting, exogenous change in ambient pollution. Even if the initial change in pollution is exogenous, the long-run nature allows more time for economic agents to respond to changes in pollution, resulting in endogenous pollution exposure. We estimate the effects of long-run pollution exposure on mortality among adults by exploiting the United States Acid Rain Program (ARP) as a natural experiment. The ARP, which regulated emissions from coal power plants, created a permanent change in pollution across vast distances, enabling us to define broad treatment areas to subsume many potential confounding effects. We use a difference-indifferences design, comparing changes in mortality over time in counties “near” regulated plants to changes in mortality in similar counties “far” from the plants. We find relative mortality in treatment counties decreased after the introduction of the ARP, with mortality improvements growing steadily over time in both economic and statistical significance. The ARP had no significant effect on residential sorting or employment, helping rule out selection or economic mechanisms. Analysis by cause of death supports the role of fine particulate matter as the relevant pollutant.
JEL-codes: I10 Q51 Q53 (search for similar items in EconPapers)
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