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.
Air pollution is both natural and human-based. Natural air pollution is caused by phenomenon such as volcanic eruption, wind erosion, decomposition and radioactive materials. Writing essay can only do as much in explaining each cause. Volcanic eruptions send sulfur dioxide, tons of ash, and soot into the air which mixes with water vapor to form acid rain.