Caused or influenced by human activity.
Air Resources Board
Best Available Control Technology
An area that does not meet (or that contributes to ambient air quality in a nearby area that does not meet) the national primary or secondary ambient air quality standard for the pollutant established by the U.S. Environmental Protection Agency pursuant to the federal Clean Air Act [as amended]. [Source: California Air Resources Board website: http://www.arb.ca.gov/cc/inventory/inventory.htm] …
Spark ignited engine where the manufacturer’s recommended operating air/fuel ratio divided by the theoretical air-to-fuel ratio required for complete combustion at full load conditions is less than or equal to 1.1. [Source: Code of Federal Regulations, Title 40, Part 63.6675.]
A case-by-case decision that considers energy, environmental and economic impacts in establishing an emissions limitation based on the maximum degree of control that can be achieved. BACT can be add-on control equipment, or modification of production processes or methods. BACT may be a design, equipment, work practice, or operational standard if imposition of an emissions …