The EPA is taking final action in making findings, under the Clean Air Act (CAA or Act), that 10 states and the District of Columbia failed to make complete ozone nonattainment state implementation plans (SIP) submittals required for 9 nonattainment areas under the Act. Under certain provisions of the Act, as implemented consistent with a memorandum issued by EPA Assistant Administrator Mary D. Nichols, on March 2, 1995, these states are required to submit SIP measures providing for certain percentage reductions in emissions of ozone precursors, termed ``rate of progress'' reductions; as well as SIP commitments to submit SIP measures providing for the remaining required rate-of-progress reductions as well as any additional emissions reductions needed for attainment of the ozone ambient air quality standards in the affected nonattainment areas. This action triggers the 18-month time clock for mandatory application of sanctions in theses states under the Act. This action is consistent with the CAA mechanism for assuring SIP submission.