(a) The following rules or portions of rules are disapproved since they represent a relaxation of previously submitted regulations and an adequate control strategy demonstration has not been submitted showing that the relaxation will not interfere with the attainment and maintenance of the National Ambient Air Quality Standards:

(1) North Central Coast Intrastate Region:

(i) Monterey Bay Unified APCD.

(A) Rule 412(a)(8), Sulfur Content of Fuels, submitted on October 23, 1974.

(b) The deletion of the following rules from the State implementation plan is disapproved since their deletion represents a relaxation of the control strategy, and an adequate demonstration showing that the relaxation will not interfere with the attainment and maintenance of the national ambient air quality standards has not been submitted:

(1) Southeast Desert Intrastate Region:

(i) Imperial County APCD.

(A) Rule 126, Sulfur Contents of Fuels, submitted on June 30, 1972 and previously approved under 40 CFR 52.223.

[42 FR 56606, Oct. 27, 1977, as amended at 43 FR 35695, Aug. 11, 1978]