§ 60.44a - Standard for nitrogen oxides.

(a) On and after the date on which the initial performance test required to be conducted under § 60.8 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 paragraphs (b) and (d) of this section, any gases which contain nitrogen oxides (expressed as NO2) in excess of the following emission limits, based on a 30-day rolling average, except as provided under § 60.46a(j)(1):

(1) NOxemission limits.

Fuel typeEmission limit for heat inputng/J(lb/million Btu)Gaseous fuels:Coal-derived fuels2100.50All other fuels860.20Liquid fuels:Coal-derived fuels2100.50Shale oil2100.50All other fuels1300.30Solid fuels:Coal-derived fuels2100.50Any fuel containing more than 25%, by weight, coal refuse(1 )(1 )Any fuel containing more than 25%, by weight, lignite if the lignite is mined in North Dakota, South Dakota, or Montana, and is combusted in a slag tap furnace23400.80Any fuel containing more than 25%, by weight, lignite not subject to the 340 ng/J heat input emission limit2.Subbituminous coal2100.50Bituminous coal2600.60Anthracite coal2600.60All other fuels2600.601 Exempt from NOX standards and NOX monitoring requirements.2 Any fuel containing less than 25%, by weight, lignite is not prorated but its percentage is added to the percentage of the predominant fuel.

(2) NOxreduction requirement.

Fuel typePercent reduction of potential combustion concentrationGaseous fuels25Liquid fuels30Solid fuels65

(b) The emission limitations under paragraph (a) of this section 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 § 60.45a.

(c) Except as provided under paragraph (d) of this section, when two or more fuels are combusted simultaneously, the applicable standard is determined by proration using the following formula:

En=[86 w+130×+210 y+260 z+340 v]/100

(d)(1) On and after the date on which the initial performance test required to be conducted under § 60.8 is completed, no new source owner or operator subject to the provisions of this subpart shall cause to be discharged into the atmosphere from any affected facility for which construction commenced after July 9, 1997 any gases which contain nitrogen oxides (expressed as NO2) in excess of 200 nanograms per joule (1.6 pounds per megawatt-hour) gross energy output, based on a 30-day rolling average, except as provided under § 60.46a(k)(1).

(2) On and after the date on which the initial performance test required to be conducted under § 60.8 is completed, no existing source owner or operator subject to the provisions of this subpart shall cause to be discharged into the atmosphere from any affected facility for which reconstruction commenced after July 9, 1997 any gases which contain nitrogen oxides (expressed as NO2) in excess of 65 ng/Jl (0.15 pounds per million Btu) heat input, based on a 30-day rolling average.