Measuring the Effects of Environmental Regulations: The Critical Importance of a Spatially Disaggregated Analysis
We examine the effects of the 1990 Clean Air Act Amendments (CAAA) on ambient concentrations of PM10 in the United States between 1990 and 2005. Consistent with prior literature, we find that non-attainment designation has no effect on the average monitor in non-attainment counties, after controlling for weather, socioeconomic characteristics at the county level and lagged concentrations. In sharp contrast, if we allow for heterogeneous treatment by type of monitor and county, we do find that the 1990 CAAA produced substantial effects. Our estimation results suggest that non-attainment counties with single monitors experienced a drop in concentrations of 10.5% relative to attainment counties. In non-attainment counties with multiple monitors, the overall effect of the regulation is an increase of ambient PM10 concentrations by 1.9%. The dirtiest monitors in these counties, however, experienced drops in PM10 of 6.1%, which suggest that regulators focus their attention on the dirtiest monitors.
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"Effects of Air Quality Regulation,"
American Economic Review,
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- Stengos, T. & Millimet, D.L. & List, J.A., 2002. "The Environmental Kuznets Curve: Real Progress or Misspecified Models?," Working Papers 2002-13, University of Guelph, Department of Economics and Finance.
- John List & Daniel Millimet & Thanasis Stengos, 2003. "The Environmental Kuznets Curve: Real Progress or Misspecified Models?," Natural Field Experiments 00500, The Field Experiments Website.
- Greenstone, Michael, 2004. "Did the Clean Air Act cause the remarkable decline in sulfur dioxide concentrations?," Journal of Environmental Economics and Management, Elsevier, vol. 47(3), pages 585-611, May.
- Michael Greenstone, 2003. "Did the Clean Air Act Cause the Remarkable Decline in Sulfur Dioxide Concentrations?," Working Papers 0407, Massachusetts Institute of Technology, Center for Energy and Environmental Policy Research.
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