Emission guideline
(e) Emission guideline means a guideline set forth in this part, with the exception of guidelines set forth pursuant to section 129 of the Clean Air Act, or in a final guideline document published under 60.22a(a), which reflects the degree of emission limitation achievable through the application of the best system of emission reduction which (taking into account the cost of achieving such reduction and any non-air quality health and environmental impact and energy requirements) the Administrator has determined has been adequately demonstrated for designated facilities.