E.P.A. to Unveil New Limit for Smog-Causing Emissions

October 1, 2015 6:22 PM

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E.P.A. to Unveil New Limit for Smog-Causing Emissions

WASHINGTON — The Obama administration on Thursday unveiled a major new regulation on smog-causing emissions that spew from smokestacks and tailpipes, significantly tightening the current Bush-era standards but falling short of more stringent regulations that public health advocates and environmentalists had urged.

The Environmental Protection Agency has set the new national standard for ozone, a smog-causing gas that often forms on hot, sunny days when chemical emissions from power plants, factories and vehicles mix in the air, at 70 parts per billion, tightening the current standard of 75 parts per billion s...

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