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Before and after views of a thoroughfare in the town of Ahvaz, Iran, show the effects on air pollution of the curfew imposed by the Iranian government to battle COVID-19. PHOTOGRAPH BY SEYED MADYAR SHOJAEIFAR, REDUX
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As the novel coronavirus tears around the world, it’s exploiting our biggest weaknesses, from creaking health care systems to extreme social inequality. Its relationship with one pervasive and neglected problem, however, is more tangled: Air pollution has intensified the pandemic, but the pandemic has—temporarily—cleaned the skies.

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