The quantity of pollen grains in the air for Sunday will be falling in the low range. This change results in part from lack of strong winds.
Smog Threatens Visitors to U.S. National Parks: Report
FRIDAY, July 31, 2015 (HealthDay News) -- Air pollution afflicts many national parks across the United States, a new study suggests.
Air quality in some of the parks is as bad or worse than in some major cities because of pollution from sources such as coal-fired power stations, the National Parks Conservation Association ... Full Article »