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Harder to breathe: Haze, unhealthy air choking US national parks, study finds

May 08, 2019
Ledyard King, USA TODAY Harder to breathe: Haze, unhealthy air choking US national parks, study finds

Hundreds of America's national parks are suffering significant levels of haze and air pollution, a National Parks Conservation Association study finds.

     
 
 

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May 07, 2019 at 12:40PM
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