EPA has released draft guidance on how to use the agency’s model for analyzing particulate matter “hot spots” to determine whether proposed transportation projects would conform with the Clean Air Act (CAA). 75 Fed. Reg. 29,537 (05/26/10). Transportation conformity is a CAA requirement under which state and local transportation agencies must ensure that federally supported highway and transit projects are consistent with, or conform to, state implementation plans (SIPs) to control air pollution. If emissions from a project and other nearby sources do not push the area into nonattainment with air quality standards, the project conforms to the CAA. EPA will accept comments on the draft guidance until July 19, 2010.