NAC445B.578. Exceptions to restrictions on visible emissions.

     1. Scheduled maintenance or repairs which result in emissions of air contaminants performed in an area determined by the Department as constituting a repair shop do not violate NAC 445B.574 to 445B.582, inclusive.

     2. Diesel-powered motor vehicles and special mobile equipment may exceed the visible emissions set forth in subsections 2 and 3 of NAC 445B.576 for not longer than 15 minutes for stationary warm-up of cold engines to achieve operating temperatures.

     3. Visible emissions in excess of those set forth in NAC 445B.577 do not violate the requirements of NAC 445B.574 to 445B.582, inclusive, if the visible emissions occur:

     (a) During maintenance or repairs.

     (b) For a period of 40 consecutive seconds or less during acceleration under load.

     (c) For a period of 4 consecutive minutes or less when loaded after a period of idle.

     [Environmental Comm’n, Engine Emission Control Reg. §§ 3.7.1-3.7.3.3, eff. 1-10-78]—(NAC A by Environmental Comm’n & Dep’t of Motor Veh. & Pub. Safety, 11-23-87, eff. 1-1-88; A by Environmental Comm’n, 10-22-92)—(Substituted in revision for NAC 445.922)