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The U.S. Environmental Protection Agency announced Wednesday its proposal for a long-delayed regulation to curb ozone pollution, a human health hazard linked to asthma, heart disease, premature death, and an array of pregnancy complications. The new measure would target ground-level ozone pollution, commonly known as smog, emitted primarily from power plants and factories. It would lower the acceptable threshold for ambient smog from 75 parts per billion to somewhere in the range of 65-70 parts per billion, while opening a comment period on a standard as low as 60 parts per billion. [Source: Newsweek]
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