; (4) identifies measures, including the use of sustainable aviation fuels, intended to reduce emissions from aircraft and airport operations and assess potential impacts on emissions related to UFPs; and (5) identifies important information gaps related to understanding relationships between UFP exposures and health effects, contributions of aviation-related emissions to UFP exposures, and the effectiveness of mitigation measures. (b) Coordination The Administrator of the Federal Aviation Administration shall coordinate with the Administrator of the Environmental Protection Agency, the Secretary of Health and Human Services, and any other agency that the Administrator deems appropriate to provide data and other assistance necessary for the study. (c) Report Not later than 2 years after the date of execution of the funding agreement between the Federal Aviation Administration and the National Academy of Sciences, the Administrator of the Federal Aviation Administration shall submit to Congress a report on the study. (d) Definition In this Act, the terms ultrafine particle and UFP mean particles with diameters less than or equal to 100 nanometers.