Barack Obama will classify carbon dioxide as a dangerous pollutant that can be regulated should he win the presidential election on Nov. 4, opening the way for new rules on greenhouse gas emissions.

The Democratic senator from Illinois will tell the Environmental Protection Agency that it may use the 1990 Clean Air Act to set emissions limits on power plants and manufacturers, his energy adviser, Jason Grumet, said in an interview. President George W. Bush declined to curb CO2 emissions under the law even after the Supreme Court ruled in 2007 that the government may do so.

If elected, Obama would be the first president to group emissions blamed for global warming into a category of pollutants that includes lead and carbon monoxide. Obama's rival in the presidential race, Republican Senator John McCain of Arizona, has not said how he would treat CO2 under the act.

Obama ``would initiate those rulemakings,'' Grumet said in an Oct. 6 interview in Boston. ``He's not going to insert political judgments to interrupt the recommendations of the scientific efforts.''

Placing heat-trapping pollutants in the same category as ozone may lead to caps on power-plant emissions and force utilities to use the most expensive systems to curb pollution. The move may halt construction plans on as many as half of the 130 proposed new U.S. coal plants.

The president may take action on new rules immediately upon taking office, said David Bookbinder, chief climate counsel for the Sierra Club. Environment groups including the Sierra Club and Natural Resources Defense Council will issue a regulatory agenda for the next president that calls for limits on CO2 from industry.

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