here are some details...
Obama Pulls Back Proposal to Tighten Clean Air Rules
The Obama administration is abandoning its plan to immediately tighten air
quality rules nationwide to cut reduce emissions of smog-causing chemicals after
an intense lobbying campaign by industry, which said the new rule would cost
billions of dollars and hundreds of thousands of jobs, officials said Friday.
The Environmental Protection Agency, following the recommendation of its
scientific advisers, had proposed lowering the so-called ozone standard from
that set by the Bush administration to a new stricter standard that would have
thrown hundreds of American counties out of compliance with the Clean Air Act.
It would have required a major effort by state and local officials, as well as
new emissions controls by industries and agriculture across the country.
The more lenient Bush administration standard from 2006 will remain in place
until a scheduled reconsideration of acceptable pollution limits in 2013,
officials indicated Friday.
Read More:
http://www.nytimes.com/2011/09/03/science/earth/03air.html?emc=na

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