Risking an election-year backlash from Republicans, the Obama administration is proposing new air quality standards to lower the amount of soot that can be released into the air.

The move, to be announced Friday, is likely to win support from environmental groups and public health advocates but exposes the president to potential criticism from congressional Republicans and industry officials that the rules are overly strict and could hurt economic growth and cause job losses in political swing states such as Ohio and Pennsylvania.

Perhaps wary of the rule's political risk, the administration had sought to delay the new soot standards until after the November elections. But a federal judge ordered officials to act after 11 states filed a lawsuit seeking a decision this year by the Environmental Protection Agency.