pollution

Mountain Clouds Change From Rain Makers To Snow Makers

Mountains challenge skiers, climbers, and road builders. But when it comes to clouds, they offer an assist. Researchers from Pacific Northwest National Laboratory and Colorado State University found that mountainous clouds have a dual response when injected with numerous tiny pollution particles.

Photos Collected Revealed EPA Significance in America

Over the years, EPA had limited the use of three pollutants, unburnt hydrocarbons, nitrogen oxides and carbon monoxide. Also, air pollution was reduced due to regulations on emissions and fuel economy since 2012.
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