N.M. Code R. § 20.11.49.14
The emission of a regulated air pollutant in excess of the quantity, rate, opacity, or concentration specified in an air quality regulation or permit condition that results in an excess emission is a violation of the air quality regulation or permit condition and may be subject to an enforcement action. If the owner or operator of a source having an excess emission chooses to continue to operate it while the excess emission continues, the owner or operator shall take all appropriate measures consistent with good air pollution control practices for minimizing emissions. The duration and extent of any excess emission and the owner or operator's efforts to minimize the excess emission may be considered by the department in any resulting enforcement action.
N.M. Code R. § 20.11.49.14