June 1, 2006 - The Environmental Protection Agency withdrew a direct final rule that had exempted the federal government from general conformity requirements for actions that result in fine particle emissions of 100 tons a year or less, citing adverse public comments.

• PM2.5 De Minimis Emission Levels for General Conformity Applicability: Withdrawal of direct final rule (PDF)(2 pp, 61 K, June 1, 2006, 40CFR Pts 51 and 93)