An implementation plan for the State's portion of the Philadelphia Interstate Air Quality Control Region was received by the Department of Health, Education, and Welfare on June 30, 1970. Supplemental information was received October 20, 1970. The Administrator has determined that the State's control strategy for sulfur oxides, as set forth in this implementation plan, is adequate for attainment of the national primary ambient air quality standards for sulfur oxides. Therefore, the Administrator has approved such control strategy, together with specified rules and regulations and the compliance schedule pertaining thereto.

An implementation plan for the State's portion of the Philadelphia Interstate Air Quality Control Region was received by the Department of Health, Education, and Welfare on May 26, 1970. Supplemental information was submitted September 23, 1970. TheAdministrator has determined that the State's control strategy for sulfur oxides, as set forth in this implementation plan, is adequate for attainment of the national primary ambient air quality standards for sulfur oxides. Therefore, the Administrator has approved such control strategy, together with specified rules and regulations and the compliance schedule pertaining thereto.

An implementation plan for the State's portion of the Philadelphia Interstate Air Quality Control Region was received by the Department of Health, Education, and Welfare on May 4, 1970. Supplemental information was received August 4, 1970. The Administrator has determined that the State's control strategy for sulfur oxides, as set forth in this implementation plan, is adequate for attainment of the national primary ambient air quality standards for sulfur oxides. Therefore, the Administrator has approved such control strategy, together with specified rules and regulations pertaining thereto.

An implementation plan for the State's portion of the Kansas City Interstate Air Quality Control Region was received by the Department of Health, Education, and Welfare on November 19, 1970. The Administrator has determined that the State's control strategy for particulate matter, as set forth in this implementation plan, is adequate for attainment of the national primary and secondary ambient air quality standards for particulate matter. Therefore, the Administrator has approved such control strategy, together with specified rules and regulations and the compliance schedule pertaining thereto.

An implementation plan for the State's portion of the National Capital Interstate Air Quality Control Region was received by the Department of Health, Education, and Welfare on April 29, 1970. Supplemental information was received August 10 and 14, 1970. The Administrator has determined that the State's control strategy for sulfur oxides and particulate matter, as set forth in this implementation plan, is adequate for attainment of the National primary and secondary ambient air quality standards for sulfur oxides and particulate matter. Therefore, the Administrator has approved such control strategy, together with specified rules and regulations and the compliance schedules pertaining thereto.

An implementation plan for the State's portion of the National Capital Interstate Air Quality Control Region was received by the Department of Health, Education, and Welfare on May 28, 1970. Supplemental information was submitted August 7 and 21, 1970. The Administrator has determined that the State's control strategy for sulfur oxides and particulate matter, as set forth in this implementation plan, is adequate for attainment of the national primary and secondary ambient air quality standards for sulfur oxides and particulate matter. Therefore, the Administrator has approved such control strategy, together with specified rules and regulations, as well as the compliance schedule pertaining to the sulfur oxides standards.

An implementation plan for the Baltimore Intrastate Air Quality Control Region was submitted to the Environmental Protection Agency on December 23, 1970. The Administrator as determined that the State's control strategy for sulfur oxides, as set forth in this implementation plan, is adequate for attainment of the national primary ambient air quality standards for sulfur oxides. The Administrator has also determined that the State's control strategy for particulate matter, as set forth in this implementation plan, is adequate for attainment of the national primary and secondary ambient air quality standards for particulate matter. Therefore, the Administrator has approved such control strategies, together with specified rules and regulations, as well as the compliance schedule pertaining to the sulfur oxides standards.

An implementation plan for the Denver Intrastate Air Quality Control Region was received by the Department of Health, Education, and Welfare on May 12, 1970, and was amended by letter dated November 10, 1970. The Administrator has determined that the State's control strategy for particulate matter, as set forth in this implementation plan, is adequate for attainment of the national primary ambient air quality standards for particulate matter. The Administrator has also determined that the State's control strategy for sulfur oxides, as set forth in this implementation plan, is adequate for maintaining the national secondary ambient air quality standards for sulfur oxides. Therefore, the Administrator has approved such control strategies, together with specified rules and regulations and the compliance schedules pertaining thereto.

An implementation plan for the State's portion of the Kansas City Intrastate Air Quality Control Region was received by the Department of Health, Education, and Welfare on October 14, 1970. The Administrator has determined that the State's control strategy for particulate matter, as set forth in this implementation plan, is adequate for attainment of the national primary and secondary ambient air quality standards for particulate matter. Therefore, the Administrator has approved such control strategy, together with specified rules and regulations and the compliance schedules pertaining thereto.

An implementation plan for the District's portion of the National Capital Interstate Air Quality Control Region was received by the Department of Health, Education, and Welfare on May 6, 1970. Supplemental information was received August 24, 1970. The Administrator has determined that the District's control strategy for sulfur oxides and particulate matter, as set forth in this implementation plan, is adequate for attainment of the national primary and secondary ambient air quality standards for sulfur oxides and particulate matter. Therefore, the Administrator has approved such control strategy, together with specified rules and regulations pertaining thereto.

An implementation plan for the Boston Intrastate Air Quality Control Region was received by the Department of Health, Education, and Welfare on September 16, 1970. The Administrator has determined that the State's control strategy for sulfur oxides,as set forth in this implementation plan, is adequate for attainment of the national primary ambient air quality standards for sulfur oxides. Therefore, the Administrator has approved such control strategy, together with specified rules and regulations and the compliance schedules pertaining thereto.