On March 24, 2010, EPA revised the General Conformity regulations. The revised rule improves the process federal entities use to demonstrate that their actions will not contribute to a violation of a national air quality standard.

• Revisions to the General Conformity Regulations (PDF)(134 pp, 447 K, March 24, 2010, 40CFR Pts 51 and 93)
• Final Revisions to the General Conformity Regulations – Fact Sheet (PDF)(3 pp, 86 K, March 2010)