Ozone can seriously affect the human respiratory system and is one of the most prevalent and widespread of all the criteria pollutants for which the Clean Air Act required EPA to set standards. Ozone in the troposphere is produced through complex chemical reactions of nitrogen oxides, hydrocarbons, and sunlight. A voluntary program established under the Aviation Safety and Noise Abatement Act of 1979. Part 150 allows airports to apply for federal funding to implement noise mitigation measures including residential soundproofing and acquisition of noise-sensitive land around airports. A Part 150 plan can also include recommendations for development near airports.
Potassium acetate places a lower oxygen demand on receiving waters than does urea.
Propylene glycol is less toxic than ethylene glycol, and is sometimes used in food and cosmetics for its water-absorbing properties. Runoff can carry pollutants from the air and land into these receiving waters. EPA-approved state plans for the establishment, regulation, and enforcement of air pollution standards. Stage 2 engines are older and noisier than Stage 3 engines. By the year 2000, most jet engines used in the United States will meet Stage 3 noise standards.