National (U.S.)

"Studies Raise Questions About Pavement Sealers"

"Airborne emissions and stray dust from coal tar–based sealers, one of the two main types of products used to coat certain asphalt pavements, may be a more significant human health threat than previously thought, according to three new studies and a review published by U.S. government and university researchers."

Source: EHP, 05/02/2012

"'Warming Hole' Delayed Climate Change Over Eastern United States"

"Climate scientists at the Harvard School of Engineering and Applied Sciences (SEAS) have discovered that particulate pollution in the late 20th century created a "warming hole" over the eastern United States-that is, a cold patch where the effects of global warming were temporarily obscured."

Source: SPX, 04/30/2012

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