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the claim

The Clean Air Act improves air quality in the US.

the verdict
INSUFFICIENT LEANING
Recorded sources
7 sources for · 0 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that the Clean Air Act improves air quality in the US?

Unclear. Several sources indicate air quality in the US improved after the Clean Air Act, including EPA statements and a review attributing vast improvements to the Act, but each covers only particular pollutants, periods, or health outcomes rather than the general causal claim.

Verdict: PARTIAL LEAN · 7 sources for, 0 against · Last checked

The private library was unavailable for some searches in this check. Missing library results are not evidence against the claim.

Evidence for · 7
Did Air Quality Improve Under Obama?
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Did Air Quality Improve Under Obama?. (n.d.). factcheck.org. https://www.factcheck.org/2017/09/air-quality-improve-obama/

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More for · 6
Air Quality, Infant Mortality, and the Clean Air Act of 1970
2004
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Chay, K. Y. & Greenstone, M. (2004). Air Quality, Infant Mortality, and the Clean Air Act of 1970. doi.org. https://doi.org/10.2139/ssrn.509182

The Clean Air Act Amendments and California Air Quality Issues
1992
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Z.C., M. (1992). The Clean Air Act Amendments and California Air Quality Issues. inis.iaea.org. https://inis.iaea.org/records/npjkb-bjt41

Accomplishments and Successes of Reducing Air Pollution from Transportation in the United States | US EPALockPrimary navigationOpen Sidenav MenuClose Sidenav Menu
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Accomplishments and Successes of Reducing Air Pollution from Transportation in the United States | US EPALockPrimary navigationOpen Sidenav MenuClose Sidenav Menu. (n.d.). epa.gov. https://www.epa.gov/transportation-air-pollution-and-climate-change/accomplishments-and-successes-reducing-air

Evaluation of the health impacts of the 1990 Clean Air Act Amendments using causal inference and machine learning
2020
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Evaluation of the health impacts of the 1990 Clean Air Act Amendments using causal inference and machine learning. (2020). doi.org. https://doi.org/10.1080/01621459.2020.1803883

Causal inference and machine learning approaches for evaluation of the health impacts of large-scale air quality regulations
2019
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Causal inference and machine learning approaches for evaluation of the health impacts of large-scale air quality regulations. (2019). doi.org. https://doi.org/10.48550/arxiv.1909.09611

Looking Back at 50 Years of the Clean Air Act
2022
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Aldy, J. E., Auffhammer, M., Cropper, M., Fraas, A., & Morgenstern, R. (2022). Looking Back at 50 Years of the Clean Air Act. doi.org. https://doi.org/10.1257/jel.20201626

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held for human review18 Oct 2026
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