NR 428.02(7w)(b) (b) “Supply interruption” or “curtailment” may not result from an increase in the cost or unit price of the primary fuel.

NR 428.02(8) (8) “Unit” means a solid fuel-fired or fossil fuel-fired combustion device.

NR 428.02 History History: Cr. (intro.), renum. from NR 154.01 (122), Register, September, 1986, No. 369, eff. 10-1-86; am. (intro.), r. (1), Register, June, 1993, No. 450, eff. 7-1-93; am. (intro.), cr. (1) to (8), Register, January, 2001, No. 541, eff. 2-1-01; CR 02-076: cr. (6m) Register November 2002 No. 563, eff. 12-1-02; CR 03-049: renum. (1) to be (1m), cr. (1) Register December 2003 No. 576, eff. 1-1-04; CR 07-016: cr. (7m) Register July 2007 No. 619, eff. 8-1-07; CR 08-103: cr. (7e) Register August 2009 No. 644, eff. 9-1-09; CR 23-017: cr. (7i), (7p), (7u), (7w) Register March 2024 No. 819, eff. 4-1-24.

NR 428.03 NR 428.03 General limitations. No person may cause, allow or permit nitrogen oxides or nitrogen compounds to be emitted to the ambient air which substantially contribute to the exceeding of an air standard or cause air pollution.

NR 428.03 History History: Renum. from NR 154.15 (1), Register, September, 1986, No. 369, eff. 10-1-86; am. Register, May, 1992, No. 437, eff. 6-1-92.

subch. I of ch. NR 428 Subchapter I — NOx Emissions Performance Program General Provisions

NR 428.04 NR 428.04 Requirements and performance standards for new or modified sources.

NR 428.04(1) (1) Applicability. The requirements of this section apply to emissions units described in this section that are located in the county of Kenosha, Milwaukee, Ozaukee, Racine, Washington or Waukesha and that are constructed or that undergo a major modification, as that term is described in ch. NR 405 or 408, after February 1, 2001. When determining whether an emissions unit undergoes a major modification for purposes of this section, any increase in CO emissions resulting from the operation of the emissions unit, or operation of NOx emissions control equipment for purposes of meeting state or federal NOx emission requirements, will not be considered in the emissions calculations.

NR 428.04(2) (2) Performance standards.

NR 428.04(2)(a) (a) Boilers.

NR 428.04(2)(a)1. 1. Solid fuel-fired units. No person may cause, allow or permit nitrogen oxides to be emitted from a solid fuel-fired boiler in amounts greater than those specified in this subdivision.

NR 428.04(2)(a)1.a. a. 0.15 pound per million Btu of heat input on a 30-day rolling average basis for boilers with a maximum design heat input of 250 million Btu per hour or greater.

NR 428.04(2)(a)1.b. b. 0.20 pound per million Btu of heat input on a 30-day rolling average basis for boilers with a maximum design heat input of less than 250 million Btu per hour.

NR 428.04(2)(a)2. 2. Gaseous fuel-fired units. No person may cause, allow or permit nitrogen oxides to be emitted from a gaseous fuel-fired boiler with a maximum design heat input of 25 million Btu per hour or greater in an amount greater than 0.05 pound per million Btu of heat input on a 30-day rolling average basis.

NR 428.04(2)(a)3. 3. Distillate fuel oil-fired boilers. No person may cause, allow or permit nitrogen oxides to be emitted from a distillate fuel oil-fired boiler with a maximum design heat input of 25 million Btu per hour or greater in an amount greater than 0.09 pound per million Btu of heat input on a 30-day rolling average basis.

NR 428.04(2)(a)4. 4. Residual fuel oil-fired boilers. No person may cause, allow or permit nitrogen oxides to be emitted from a residual fuel oil-fired boiler with a maximum design heat input of 25 million Btu per hour or greater in an amount greater than 0.15 pound per million Btu of heat input on a 30-day rolling average basis.

NR 428.04(2)(a)5. 5. Kraft recovery boilers. No person may cause, allow or permit nitrogen oxides to be emitted from a kraft recovery boiler with a maximum design heat input of 50 million Btu per hour or greater in an amount greater than 0.10 pound per million Btu of heat input on a 30-day rolling average basis.

NR 428.04(2)(b) (b) Cement kilns, lime kilns and calciners. No person may cause, allow or permit nitrogen oxides to be emitted from a cement kiln, lime kiln or calciner with a maximum design heat input of 50 million Btu per hour or greater in amounts greater than those specified in this paragraph.

NR 428.04(2)(b)1. 1. 0.10 pound per million Btu on a 30-day rolling average basis when burning gaseous fuel.

NR 428.04(2)(b)2. 2. 0.12 pound per million Btu on a 30-day rolling average basis when burning distillate fuel oil.

NR 428.04(2)(b)3. 3. 0.20 pound per million Btu on a 30-day rolling average basis when burning residual fuel oil.

NR 428.04(2)(b)4. 4. 0.60 pound per million Btu on a 30-day rolling average basis when burning solid fuel.

NR 428.04(2)(c) (c) Reheat, annealing and galvanizing furnaces. No person may cause, allow or permit nitrogen oxides to be emitted from a reheat furnace, annealing furnace or galvanizing furnace with a maximum design heat input of 50 million Btu per hour or greater in an amount greater than 0.10 pound per million Btu on a 30-day rolling average basis.

NR 428.04(2)(d) (d) Glass furnaces. No person may cause, allow or permit nitrogen oxides to be emitted from a glass furnace with a maximum design heat input of 50 million Btu per hour or greater in an amount greater than 4.0 pounds per ton of pulled glass on a 30-day rolling average basis.

NR 428.04(2)(e) (e) Asphalt plants. No person may cause, allow or permit nitrogen oxides to be emitted from an asphalt plant with a maximum design heat input of 50 million Btu per hour or greater in amounts greater than those specified in this paragraph.

NR 428.04(2)(e)1. 1. 0.15 pound per million Btu of heat input on a 30-day rolling average basis when burning gaseous fuel.

NR 428.04(2)(e)2. 2. 0.20 pound per million Btu of heat input on a 30-day rolling average basis when burning distillate fuel oil.

NR 428.04(2)(e)3. 3. 0.27 pound per million Btu of heat input on a 30-day rolling average basis when burning residual fuel oil or waste oil.

NR 428.04(2)(f) (f) Process heating units. No person may cause, allow or permit nitrogen oxides to be emitted from a process heater, dryer, oven or other external combustion unit with a maximum design heat input of 50 million Btu per hour or greater in amounts greater than those specified in this paragraph.