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What percentage of the u.s. population lives in areas with dangerous levels of air pollution??
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What percentage of the u.s. population lives in areas with dangerous levels of air pollution??
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Jun 11, 2019
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What percentage of the u.s. population lives in areas with dangerous levels of air pollution??
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47% of the us lives in frequently unhealthy levels of ozone or particulate pollution
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Jun 18, 2019
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