N.M. Code R. § 20.2.18.110
The owner or operator of existing oil burning equipment having a rated heat capacity greater than 250 million British Thermal Units per hour (higher heating value) per unit shall not permit, cause, suffer or allow particulate matter emissions to the atmosphere:
C. in excess of 0.20 pounds per million British Thermal Units of heat input (higher heating value) from equipment used to generate steam or electrical power for on-site use only and constructed before January 1, 1950.
[11/30/95; 20.2.18.110 NMAC - Rn, 20 NMAC 2.18.110 10/31/02]