Residential neighborhoods located directly west of Ontario International Airport experience high noise levels. In the early 1990s, the Federal Aviation Administration, City of Los Angeles, and City of Ontario created a program to improve the quality of life in noise-impacted neighborhoods and community/airport compatibility. Eligible homes are outfitted with sound insulation to reduce the interior noise levels to 45db CNEL. The second component consists of the voluntary acquisition of eligible properties and reuse of properties in a manner compatible with the airport. Since the program began in 1994, 971 units have been sound insulated and an estimated 2,100 homes are eligible for sound insulation. To date, the RDA has acquired 217 properties and 120 are eligible for acquisition.