The following is a list of useful links that are
related to the environment and emission testing:

AMTIC - Ambient Monitoring Technology Information Center
ASTM - American Society for Testing and Materials
AWWA - American Water Works Association
USEPA - United States Environmental Protection Agency
USEPA - Clean Air Act
USEPA - Office of Air and Radiation
USEPA - Acid Rain Program
CFR - The Code of Federal Regulations Searchable Database
EMC/TTN - US EPA Emissions Measurement Center