(a) Notwithstanding any other provision of law, the bay district shall adopt, implement, and enforce transportation control measures for the attainment of state or federal ambient air quality standards, in accordance with all of the following procedures:

1. (1) The bay district shall estimate, by June 30, 1989, the quantity of emission reductions from transportation sources necessary to attain and maintain state and federal ambient air standards.
2. (2) The Metropolitan Transportation Commission, in cooperation with the bay district, the Association of Bay Area Governments, local entities, and employers, shall develop and adopt a plan to control emissions from transportation sources which will achieve the emission reductions established pursuant to paragraph (1). The plan shall include, at a minimum, a schedule for implementing transportation control measures, identification of potential implementing agencies and any agreements entered into by agencies to implement portions of the plan, and a procedure for monitoring the effectiveness of and compliance with the measures. The commission shall submit the plan to the bay district for its adoption according to a reasonable schedule developed by the bay district in consultation with the commission, but not later than June 30, 1990.
3. (3) Upon receipt of the plan submitted by the commission, the bay district shall review the plan to determine if it will achieve the emission reductions specified in paragraph (1). If the bay district determines that the plan will achieve those reductions, the bay district shall adopt the plan and implement it immediately. If the bay district determines that the plan will not achieve the emission reductions specified in paragraph (1), it shall notify the commission of the specific deficiencies in the plan and return the plan to the commission for revision. Within 60 days after receipt of the plan, the commission shall revise it and return it to the bay district. If the bay district determines that the revised plan will achieve necessary emission reductions, the bay district shall adopt the plan and implement it immediately. If the bay district determines that the revised plan still will not achieve the emission reductions specified in paragraph (1), or if the plan is not submitted pursuant to the schedule established under paragraph (2), the bay district shall develop and adopt a plan to control emissions from transportation sources.
4. (4) As the bay district periodically revises its estimates of the emission reductions from transportation sources necessary to attain state and federal ambient air standards specified in paragraph (1), the plan for transportation control measures shall also be revised, adopted, and enforced according to the procedure established pursuant to paragraphs (1), (2), and (3).

(b) The bay district may delegate any function with respect to transportation control measures to any local agency, if all of the following conditions are met:

1. (1) The local agency submits to the bay district an implementation plan which provides adequate resources to adopt and enforce the measures, and the bay district approves the plan.
2. (2) The local agency agrees to adopt and implement measures at least as stringent as those in the district air quality management plan to attain state standards.
3. (3) The bay district adopts procedures to review the performance of the local agency in implementing the measures to ensure compliance with the district air quality management plan to attain state standards.