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.
Lesson Summary. Air pollution is the release of air pollutants into the atmosphere. Those pollutants may be gases or particulate matter and can come from a variety of sources. The two types of pollution sources, point source and non-point source, describe how the pollutants enter the air, either from a single source or from many different sources.