Don’t Take a Test on a Hot Polluted Day

Taking a test on a hot and polluted day can result in a measurably lower score which, if the test is for something like a university entrance exam, can have permanent consequences. I find both of these results hard to believe which doesn’t necessarily mean that they shouldn’t be believed.

Heat Stress and Human Capital Production by Jisung Park

How does temperature affect the human capital production process? Evidence from 4.6 million New York City high school exit exams suggests that heat stress on exam days reduces test scores and educational attainment by economically significant magnitudes, and that cumulative heat exposure during the school-year prior may affect the rate of learning. Taking an exam on a 90°F day relative to a 72°F day leads to a 0.19 standard deviation reduction in exam performance, equivalent to a quarter of the Black-White achievement gap, and a 12.3% higher likelihood of failing an exam. Teachers clearly try to offset the impacts of exam day heat stress by selectively boosting grades just below passing thresholds, while existing air conditioning seems to have a limited protective effect.  These findings may have implications for estimating the social cost of carbon, for designing education policy, and for understanding of climate in explaining income gaps across individuals and nations.

The Long-Run Economic Consequences of High-Stakes Examinations: Evidence from Transitory Variation in Pollution by Avraham Ebenstein, Victor Lavy and Sefi Roth.

Cognitive performance during high-stakes exams can be affected by random disturbances that, even if transitory, may have permanent consequences. We evaluate this hypothesis among Israeli students who took a series of matriculation exams between 2000 and 2002. Exploiting variation across the same student taking multiple exams, we find that transitory PM2.5 exposure is associated with a significant decline in student performance. We then examine these students in 2010 and find that PM2.5 exposure during exams is negatively associated with postsecondary educational attainment and earnings. The results highlight how reliance on noisy signals of student quality can lead to allocative inefficiency.


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