EPA is approving a State Implementation Plan (SIP) revision submitted by the State of Connecticut to satisfy certain federal requirements for the New Haven initial PM10 nonattainment area. The purpose of this action is to bring about the attainment of the national ambient air quality standards (NAAQS) for particulate matter with an aerodynamic diameter less than or equal to a nominal 10 micrometers (PM10). EPA is also approving reasonable available control measures (RACM) and contingency measures for the New Haven initial PM10 moderate nonattainment area as established in this SIP revision, since Connecticut has demonstrated implementation of RACM will attain and maintain the PM10 NAAQS. Additionally, EPA is approving Connecticut's adoption of the PM10 NAAQS and emergency episode regulation. This action is being taken under the Clean Air Act.