Concentration of pollen grains in the air for Saturday will be rising in the moderate range. This increase is due to seasonally normal weather conditions which are favorable for the production and dispersal of pollen.
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 »