ESGRâs Customer Service Center is available to answer a USERRA question or to refer cases to a trained Ombudsman. Contact the Customer Service Center Monday through Friday (except federal holidays) 8AM to 6PM (EST): 1  By Phone: 800-336-4590 option 1. 2  By Email: osd.USERRA@mail.mil.
Because a large share of air pollution is caused by combustion of fossil fuels such as coal and oil, the reduction of these fuels can reduce air pollution drastically. Most effective is the switch to clean power sources such as wind power, solar power, hydro power which don't cause air pollution.
National Emissions Standards for Hazardous Air Pollutants - Pollution sources. 1  Most air toxics originate from human-made sources, including mobile sources (e.g., cars, trucks, buses) and stationary sources (e.g., factories, refineries, power plants), as well as indoor sources (e.g., building materials and activities such as cleaning).