The following sources shall be exempt from this chapter:
- (a) Any stationary source having combined theoretical potential emissions of less than 50 tons of NOx during any consecutive 12-month period since January 1, 1989;
- (b) Temporary boilers that have theoretical potential emissions of less than 50 tons of NOx during any consecutive 12-month period; and
- (c) Stationary combustion turbines mounted on aircraft.
Source. #12584, eff 8-15-18