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Clean Identification? The Effects of the Clean Air Act on Air Pollution, Exposure Disparities, and House Prices

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  • Lutz Sager
  • Gregor Singer

Abstract

We assess the US Clean Air Act standards for fine particulate matter (PM2.5). Using high-resolution data, we find that the 2005 regulation reduced PM2.5 levels by 0.4 μg/ m3 over five years, with larger effects in more polluted areas. Standard difference-in-differences overstates these effects by a factor of three because time trends differ by baseline pollution, a bias we overcome with three alternative approaches. We show that the regulation contributed to narrowing Urban-Rural and Black-White PM2.5 exposure disparities, but less than difference-in-differences suggest. Pollution damages capitalized into house prices, however, appear larger than previously thought when leveraging regulatory variation.

Suggested Citation

  • Lutz Sager & Gregor Singer, 2025. "Clean Identification? The Effects of the Clean Air Act on Air Pollution, Exposure Disparities, and House Prices," American Economic Journal: Economic Policy, American Economic Association, vol. 17(1), pages 1-36, February.
    • Handle: RePEc:aea:aejpol:v:17:y:2025:i:1:p:1-36
    DOI: 10.1257/pol.20220745
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    References listed on IDEAS

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    3. Janet Currie & John Voorheis & Reed Walker, 2023. "What Caused Racial Disparities in Particulate Exposure to Fall? New Evidence from the Clean Air Act and Satellite-Based Measures of Air Quality," American Economic Review, American Economic Association, vol. 113(1), pages 71-97, January.
    4. Sebastian Calonico & Matias D. Cattaneo & Rocio Titiunik, 2014. "Robust Nonparametric Confidence Intervals for Regression‐Discontinuity Designs," Econometrica, Econometric Society, vol. 82, pages 2295-2326, November.
    5. Abadie, Alberto & Diamond, Alexis & Hainmueller, Jens, 2010. "Synthetic Control Methods for Comparative Case Studies: Estimating the Effect of California’s Tobacco Control Program," Journal of the American Statistical Association, American Statistical Association, vol. 105(490), pages 493-505.
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    7. Abdulrahman Jbaily & Xiaodan Zhou & Jie Liu & Ting-Hwan Lee & Leila Kamareddine & Stéphane Verguet & Francesca Dominici, 2022. "Air pollution exposure disparities across US population and income groups," Nature, Nature, vol. 601(7892), pages 228-233, January.
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    More about this item

    JEL classification:

    • D63 - Microeconomics - - Welfare Economics - - - Equity, Justice, Inequality, and Other Normative Criteria and Measurement
    • K32 - Law and Economics - - Other Substantive Areas of Law - - - Energy, Environmental, Health, and Safety Law
    • Q52 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Environmental Economics - - - Pollution Control Adoption and Costs; Distributional Effects; Employment Effects
    • Q53 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Environmental Economics - - - Air Pollution; Water Pollution; Noise; Hazardous Waste; Solid Waste; Recycling
    • Q58 - Agricultural and Natural Resource Economics; Environmental and Ecological Economics - - Environmental Economics - - - Environmental Economics: Government Policy
    • R31 - Urban, Rural, Regional, Real Estate, and Transportation Economics - - Real Estate Markets, Spatial Production Analysis, and Firm Location - - - Housing Supply and Markets

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