EPA determines to be achievable, which is known as the Maximum Achievable Control Technology (MACT) [http://www.epa.gov/ttn/atw/112dpg.html]. These standards are authorized by Section 112 of the Clean Air Act and the regulations are published in 40 CFR Parts 61 and 63. Pollutants The USEPA regulates the following hazardous air pollutants via the MACT standards: