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What Happens When the Air Quality Index Surpasses 500?

New York City’s smoke-clogged air reached 407 on the Environmental Protection Agency’s 500-point Air Quality Index at one point this week, signifying that pollution levels were “hazardous” and at historically dangerous levels.

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air pollution, air quality, epa, environmental protection agency, breathing, health, pollution levels, hazardous air, engish, highlight

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