In the event that states do not submit a State Implementation Plan to address transport of air pollutants across state lines or ambient air quality, as required by the Clean Air Act, the EPA may issue a Federal Implementation Plan (FIP). An FIP is an implementation plan developed by the EPA which outlines how a state or local nonattainment area will address noncompliance with the NAAQS.
Sources: U.S. EPA. 2011 Region 5 Air and Radiation. State Implementation Plans. Accessed on 9 September 2013. Available at http://www.epa.gov
US Legal. 2013. Federal Implementation Plan [Pollution Prevention] Law and Legal Definition. Accessed on 9 September 2013. Available at: http://definitions.uslegal.com