Each year, over 300 million people travel to national parks in the United States to take in the natural beauty of our country. Visitors are looking to get away from the hustle and bustle of urban areas, along with the noise and air pollution associated with the city – but their efforts might be in vain.A new study published in Science Advances has found that poor air quality in national parks could be negatively affecting visitation.Researchers from Iowa State …
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