TreasureX Researchnber.wpAir Pollution Is Quietly Shrinking What Students Learn
A. Patrick Behrer, Joshua Goodman, J. Parker Goyer, R. Jisung Park · September 11, 2026
A new NBER study by Behrer, Goodman, Goyer, and Park asks a simple but understudied question: how much does dirty air actually cost students in learning? The authors tracked nearly 10 million U.S. high school students taking the PSAT more than once, comparing the same student's score changes when the air before one attempt was cleaner or dirtier than before another. To avoid confusing pollution with other local factors, they used smoke drifting in from distant wildfires as an outside source of variation in fine particulate matter (PM2.5).
The result: a year of typical pollution exposure cuts learning by roughly 0.04–0.06 standard deviations, or 14–19% of the score growth a student normally gains in a year. Strikingly, most of the harm comes from moderate pollution days — levels below the EPA's old standard — and from exposure during the school year rather than summer, suggesting missed instruction, not just test-day haze, is the mechanism. The damage is about three times larger in disadvantaged schools and among Black and Hispanic students.
Why it matters: air quality is usually framed as a health issue, but this reframes it as an education and human-capital issue. Cleaner air near schools could raise achievement and narrow gaps at relatively low cost, while pollution quietly drags on future productivity and earnings.
Attribution: This summary is based on research from the National Bureau of Economic Research. Read the original paper at https://www.nber.org/papers/w35670#fromrss
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