Control Technique Guideline (CTG)

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A term used in the federal Clean Air Act to describe directives issued by the Environmental Protection Agency, outlining specific pollution-abating steps required in a particular facility or industry. 

The act provides that major polluters must install reasonably available control technology to alleviate sources of air pollution. The EPA issues guidelines which describe the type of equipment or methods a particular plant or industry must install. These documents are referred to in the act as control technique guidelines.