Attorneys general from nine states sent a letter to the White House Office of Management and Budget December 6 urging the Environmental Protection Agency to set a stringent national ambient air quality standard for fine particulate matter not higher than 12 ug/m3. The office recommended that the agency release a proposed rule this summer considering a range of 12-13 ug/m3, rather than the agency’s 12 ug/m3, and to take comment on setting the standard at 11 ug/m3. The agency faces a December 14 court deadline to finalize the rule.