The Environmental Protection Agency's revision of its March 2011 proposed rule on boiler maximum achievable control technology (MACT), announced on Dec. 2, would offer industry more flexibility in meeting emission targets, the agency says. EPA plans to finalize the rule, which would apply to the 1% of boilers that emit the most pollutants, in spring 2012. The Council of Industrial Boiler Owners says the revision would ease compliance for sources.