programs, publications, and other means. (5) To develop educational and training materials and programs, including national and regional workshops, to support State and local noise abatement and control programs. (6) To establish regional technical assistance centers which use the capabilities of university and private organizations to assist State and local noise control programs. (7) To undertake an assessment of the effectiveness of the Noise Control Act of 1972. (c) Preferred Approaches In carrying out its duties under this section, the Office shall emphasize noise abatement approaches that rely on local and State activities, market incentives, and coordination with other public and private agencies. (d) Study (1) In general Using funds made available to the Office, the Administrator shall carry out a study of airport noise. The Administrator shall carry out the study by entering into contracts or other agreements with independent scientists with expertise in noise measurements, noise effects, and noise abatement techniques to conduct the study. (2) Contents The study shall examine the selection of noise measurement methodologies by the Federal Aviation Administration, the threshold of noise at which health impacts are felt, and the effectiveness of noise abatement programs at airports around the Nation. (3) Report Not later than 24 months after the date of enactment of this Act, the Administrator shall transmit to Congress a report on the results of the study, together with specific recommendations on new measures that can be implemented to mitigate the impact of aircraft noise on surrounding communities. 4. Grants under quiet communities program Section 14(c)(1) of the Noise Control Act of 1972 ( 42 U.S.C. 4913(c)(1) ) is amended— (1) by striking and at the end of subparagraph (C)