SAN DIEGO COUNTY AIR POLLUTION CONTROL DISTRICT

RULE 260.44a - STANDARD FOR NITROGEN OXIDES

(a) On and after the date on which the initial performance test required to be conducted under Rule 260.8 is completed, no owner or operator subject to the provisions of this subpart shall cause to be discharged into the atmosphere from any affected facility, except as provided under Section (b) of this rule, any gases which contain nitrogen oxides in excess of the following emission limits, based on a 30-day rolling average.
 

  1. NOx Emission Limits 

Emission Limit 

ng/J (lb/million Btu) 
Fuel TypeHeat Input
Gaseous fuels:
  Coal-derived fuels 

All other fuels
210 

86
(0.50) 

(0.20)
Liquid fuels:
 

Coal-derived fuels 

Shale oil 

All other fuels

210 

210 

130

(0.50) 

(0.50) 

(0.30)

Solid fuels:
  Coal-derived fuels 

Any fuel containing more than 25% by weight, coal refuse
210 (0.50)
   

Exempt from NOx standards and NO2 monitoring requirements

Any fuel containing more than 25%, by eight, lignite if the lignite is mined in North Dakota, South Dakota, or Montana, and is combusted in a slag tap furnace. 340 (0.80)
Lignite not subject to the 340 ng/J heat input emission limit 260 (0.60)
Subbituminous coal 210 (0.50)
Bituminous coal 260 (0.60)
Anthracite coal 260 (0.60)
  1. NOx Reduction Requirements

Percent reduction of 

potential combustion 
Fuel Typeconcentration 
Gaseous fuels

25%

Liquid fuels

30%

Solid fuels

65%

 

(b) The emission limitations under Section (a) of this rule do not apply to any affected facility which is combusting coal-derived liquid fuel and is operating under a commercial demonstration permit issued by the Administrator in accordance with the provisions of Rule 260.45a.

(c) When two or more fuels are combusted simultaneously, the applicable standard is determined by proration using the following formula: