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42 U.S. Code § 7571. Establishment of standards
(a) Study; proposed standards; hearings; issuance of regulations
(1) Within 90 days after December 31, 1970, the Administrator shall commence a study and investigation of emissions of air pollutants from aircraft in order to determine—
(A)
the extent to which such emissions affect air quality in air quality control regions throughout the United States, and
(B)
the technological feasibility of controlling such emissions.
(2)
(A)
The Administrator shall, from time to time, issue proposed emission standards applicable to the emission of any air pollutant from any class or classes of aircraft engines which in his judgment causes, or contributes to, air pollution which may reasonably be anticipated to endanger public health or welfare.
(B)
(i)
The Administrator shall consult with the Administrator of the Federal Aviation Administration on aircraft engine emission standards.
(ii)
The Administrator shall not change the aircraft engine emission standards if such change would significantly increase noise and adversely affect safety.