NR 404.02(8) (8) “Reference method" means a method of sampling and analyzing the ambient air for an air pollutant that is specified as a reference method in 40 CFR part 50, Appendices A to N, incorporated by reference in s. NR 484.04 (2), a method that has been designated as a reference method in accordance with 40 CFR part 53, or a method that has been so designated by the department. It does not include a method for which a reference method designation has been canceled in accordance with 40 CFR 53.11 or 53.16.
NR 404.02(9) (9) “Secondary air standard" means the level of air quality which may be necessary to protect public welfare from unknown or anticipated adverse effects.
NR 404.02(10) (10) “Suspended particulate matter" means any solid or liquid particle dispersed and suspended in air which is capable of being trapped on the filter of a high volume air particulate sampler.
NR 404.02 History History: Cr. Register, March, 1972, No. 195, eff. 4-1-72; cr. (intro.), Register, August, 1981, No. 308, eff. 9-1-81; renum. from NR 155.01, r. (5) to (7), renum. (4) to (5) and am., am. (1) to (3), cr. (4) and (6) to (13), Register, July, 1985, No. 355, eff. 8-1-85; renum. from NR 404.01 and am. (intro.), r. (3) and (5), renum. (4) to (13) to be (3), (4), NR 400.02 (64), (5) to (10), Register, September, 1986, No. 369, eff. 10-1-86; cr. (4m) and (11), am. (8), Register, December, 1988, No. 396, eff. 1-1-89; am. (intro.), (4m), (8) and (11), renum. (1) to be NR 400.02 (5s) and am., Register, May, 1992, No. 437, eff. 6-1-92; am. (4m), (8) and (11), Register, December, 1995, No. 480, eff. 1-1-96; am. (intro.), Register, October, 1999, No. 526, eff. 11-1-99; CR 03-066: renum. (2) to be NR 400.02 (19m), am. (8) Register May 2005 No. 593, eff. 6-1-05; CR 07-082: cr. (4e) Register September 2009 No. 645, eff. 10-1-09; CR 10-050: renum. (4e), (4m) to be NR 400.02 (123e), (123s) and am. Register November 2010 No. 659, eff. 12-1-10; CR 07-082: r. (11) Register November 2011 No. 671, eff. 12-1-11.
NR 404.03 NR 404.03Air quality control regions. The following air quality control regions, which include counties in Wisconsin, have been designated:
NR 404.03(1) (1)Interstate air quality control regions.
NR 404.03(1)(a)(a) The Duluth (Minnesota) — Superior (Wisconsin) Interstate Air Quality Control Region includes the counties of Ashland, Bayfield, Burnett, Douglas, Iron, Price, Rusk, Sawyer, Taylor, and Washburn in Wisconsin, and the counties of Aitkin, Carlton, Cook, Itasca, Koochicing, Lake, and St. Louis in Minnesota.
NR 404.03(1)(b) (b) The Southeast Minnesota — La Crosse (Wisconsin) Interstate Air Quality Control Region includes the counties of Barron, Buffalo, Chippewa, Clark, Crawford, Dunn, Eau Claire, Jackson, La Crosse, Monroe, Pepin, Pierce, Polk, St. Croix, Trempealeau, and Vernon in Wisconsin, and the counties of Blue Earth, Brown, Dodge, Faribault, Fillmore, Freeborn, Goodhue, Houston, LeSueur, Martin, Mower, Nicollet, Olmsted, Rice, Sibley, Steele, Wabasha, Waseca, Watonwan, and Winona in Minnesota.
NR 404.03(1)(c) (c) The Metropolitan Dubuque Interstate Air Quality Control Region includes Grant county in Wisconsin and Clayton, Dubuque, and Jackson counties in Iowa.
NR 404.03(1)(d) (d) The Rockford (Illinois) — Janesville-Beloit (Wisconsin) Interstate Air Quality Control Region includes Rock county in Wisconsin, and Boone, DeKalb, Ogle, Stephenson, and Winnebago counties in Illinois.
NR 404.03(2) (2)Intrastate air quality control regions.
NR 404.03(2)(a)(a) The Lake Michigan Intrastate Air Quality Control Region consists of the counties of Brown, Calumet, Door, Fond du Lac, Green Lake, Kewaunee, Manitowoc, Marinette, Marquette, Menominee, Oconto, Outagamie, Shawano, Sheboygan, Waupaca, Waushara, and Winnebago. For purposes of applying rules and regulations the Lake Michigan Air Region is divided into 2 subregions. Winnebago, Outagamie and Brown counties constitute subregion I. Calumet, Door, Fond du Lac, Green Lake, Kewaunee, Manitowoc, Marinette, Marquette, Menominee, Oconto, Shawano, Sheboygan, Waupaca, and Waushara counties constitute subregion 2.
NR 404.03(2)(b) (b) The Southeastern Wisconsin Intrastate Air Quality Control Region consists of the counties of Kenosha, Milwaukee, Ozaukee, Racine, Walworth, Washington and Waukesha.
NR 404.03(2)(c) (c) The Southern Wisconsin Intrastate Air Quality Control Region consists of the counties of Columbia, Dane, Dodge, Green, Iowa, Jefferson, Lafayette, Richland and Sauk.
NR 404.03(2)(d) (d) The North Central Wisconsin Intrastate Air Quality Control Region consists of the counties of Adams, Forest, Florence, Juneau, Langlade, Lincoln, Marathon, Oneida, Portage, Vilas and Wood.
NR 404.03 History History: Cr. Register, March, 1972, No. 195, eff. 4-1-72; r. and recr. Register, July, 1985, No. 355, eff. 8-1-85; renum. from NR 404.02, Register, September, 1986, No. 369, eff. 10-1-86.
NR 404.04 NR 404.04Ambient air quality standards.
NR 404.04(1) (1)Applicability of air standards. The air standards apply to the entire state without exception.
NR 404.04(2) (2)Sulfur oxides.
NR 404.04(2)(a)(a) Primary standard. The primary standard for sulfur oxides, measured as sulfur dioxide, is 0.075 ppm — maximum 1-hour concentration. The 1-hour primary standard is met at an ambient air quality monitoring site when the 3-year average of the annual (99th percentile) of the daily maximum 1-hour average concentrations is less than or equal to 0.075 ppm, as determined by the methodology of 40 CFR part 50, Appendix T, incorporated by reference in s. NR 484.04 (7m).
NR 404.04(2)(b) (b) Secondary standard. The secondary standard for sulfur oxides, measured as sulfur dioxide, is: 0.5 ppm — maximum 3-hour average concentration, not to be exceeded more than once per year.
NR 404.04(4) (4)Carbon monoxide: primary and secondary standards. The primary and secondary standards for carbon monoxide are:
NR 404.04(4)(a) (a) 10 milligrams per cubic meter (9 ppm) — maximum 8-hour average concentration, not to be exceeded more than once per year.
NR 404.04(4)(b) (b) 40 milligrams per cubic meter (35 ppm) — maximum 1-hour concentration, not to be exceeded more than once per year.
NR 404.04(5) (5)Ozone: primary and secondary standards. The primary and secondary standards for ozone are:
NR 404.04(5)(a) (a) 0.12 ppm (235 micrograms per cubic meter) — maximum 1-hour average concentration. The 1-hour ozone standards are attained when the expected number of days per calendar year with maximum hourly average concentrations above the designated level is equal to or less than one, as determined by the methodology of 40 CFR part 50, Appendix H, incorporated by reference in s. NR 484.04 (4).
NR 404.04(5)(b) (b) 0.08 ppm — maximum 8-hour concentration. The 8-hour ozone standards are attained when the arithmetic mean of the fourth highest daily maximum 8-hour concentration at an ambient air quality monitoring site is less than or equal to 0.08 ppm, as determined by the methodology of 40 CFR part 50, Appendix I, incorporated by reference in s. NR 484.04 (4m).
NR 404.04(5)(c) (c) 0.075 ppm — maximum 8-hour concentration. The 8-hour primary and secondary ozone ambient air quality standards are attained at an ambient air quality monitoring site when the 3-year average of the annual fourth-highest daily maximum 8-hour average ozone concentration is less than or equal to 0.075 ppm, as determined in accordance with 40 CFR part 50, Appendix P, incorporated by reference in s. NR 484.04 (6t).
NR 404.04 Note Note: The Department promulgated the 1-hour and the 8-hour ozone standards, in pars. (a) and (b), respectively, in response to actions by the US EPA. Since the US EPA did not repeal these standards when it promulgated the 8-hour standard reflected in par. (c), the Department has retained them consistent with its statutory obligation under s. 285.21 (1) (a), Stats.
NR 404.04(6) (6)Nitrogen dioxide.
NR 404.04(6)(a)(a) Primary standards. The primary standards for nitrogen dioxide are:
NR 404.04(6)(a)1. 1. 0.053 ppm — primary annual average concentration. The primary annual standard is met when the annual average concentration in a calendar year is less than or equal to 0.053 ppm, as determined by the methodology of 40 CFR part 50, Appendix S, incorporated by reference in s. NR 484.04 (7).
NR 404.04(6)(a)2. 2. 0.100 ppm — primary 1-hour average concentration. The primary 1-hour standard is met when the 3-year average of the annual 98th percentile of the daily maximum 1-hour average concentration is less than or equal to 0.100 ppm, as determined by the methodology of 40 CFR part 50, Appendix S, incorporated by reference in s. NR 484.04 (7).
NR 404.04(6)(b) (b) Secondary Standard. The secondary standard for nitrogen dioxide is 0.053 ppm. The secondary standard is attained when the annual arithmetic mean concentration in a calendar year is less than or equal to 0.053 ppm, rounded to three decimal places. Fractional parts equal to or greater than 0.0005 ppm shall be rounded up. To demonstrate attainment, an annual mean shall be based upon hourly data that are at least 75% complete or upon data derived from manual methods that are at least 75% complete for the scheduled sampling days in each calendar quarter.
NR 404.04(7) (7)Lead: primary and secondary standards. The primary and secondary standards for lead and its compounds, measured as elemental lead, are the following:
NR 404.04(7)(a) (a) 1.5 micrograms per cubic meter, maximum arithmetic mean averaged over a calendar quarter, as a constituent of suspended particulate matter. The primary and secondary standards for lead and its compounds, measured as elemental lead are attained when the maximum arithmetic mean averaged over a calendar quarter is less than or equal to 1.5 micrograms per cubic meter, as determined in accordance with 40 CFR part 50, Appendix B, incorporated by reference in s. NR 484.04 (3).
NR 404.04(7)(b) (b) 0.15 micrograms per cubic meter – maximum arithmetic mean. The primary and secondary ambient air quality standards for lead are attained when the maximum arithmetic 3-month mean concentration for a 3-year period is less than or equal to 0.15 micrograms per cubic meter, as determined in accordance with 40 CFR part 50, Appendix R, incorporated by reference in s. NR 484.04 (6v).
NR 404.04(8) (8)PM10: primary and secondary standards.
NR 404.04(8)(a)(a) The primary and secondary standards for PM10 are 150 micrograms per cubic meter (mg/m3) — maximum 24-hour average concentration.
NR 404.04(8)(b) (b) The PM10 standards are attained when the expected number of days per calendar year with a 24-hour average concentration above 150 mg/m3, the level designated in par. (a), is equal to or less than one.
NR 404.04(8)(c) (c) The expected concentrations and number of days shall be determined by the methodology contained in 40 CFR part 50, Appendix K, incorporated by reference in s. NR 484.04 (6).
NR 404.04(9) (9)PM2.5: Primary and secondary standards.
NR 404.04(9)(a)(a) The primary and secondary standards for PM2.5 are:
NR 404.04(9)(a)1. 1. 15.0 micrograms per cubic meter (mg/m3) — annual arithmetic mean concentration.
NR 404.04(9)(a)2. 2. 35 micrograms per cubic meter (mg/m3) — 24-hour average concentration.
NR 404.04(9)(b) (b) The PM2.5 standards are attained when all of the following are met:
NR 404.04(9)(b)1. 1. The annual arithmetic mean concentration is less than or equal to 15.0 mg/m3, the level designated in par. (a) 1.
NR 404.04(9)(b)2. 2. The ninety-eighth percentile 24-hour average concentration is less than or equal to 35mg/m3, the level designated in par. (a) 2.
NR 404.04(9)(c) (c) The calculated concentrations shall be determined by the methodology contained in 40 CFR part 50, Appendix N, incorporated by reference in s. NR 484.04 (6r).
NR 404.04 History History: Cr. Register, March, 1972, No. 195, eff. 4-1-72; r. (1) (b)1. and 2., renum. (1) (b) 3., to be 1., Register, June, 1975, No. 234, eff. 7-1-75; am. (4), Register, August, 1981, No. 308, eff. 9-1-81; reprinted to correct error in (3), Register, November, 1981, No. 311; cr. (7), Register, April, 1983, No. 328, eff. 5-1-83; r. (5), Register, November, 1983, No. 335, eff. 12-1-83; am. Register, July, 1985, No. 355, eff. 8-1-85; renum. from NR 404.03, Register, September, 1986, No. 369, eff. 10-1-86; r. (3) (a), renum. (3) (b) to be (3) and am., cr. (8), Register, September, 1989, No. 405, eff. 10-1-89; am. (5) and (8) (b) 3., Register, May, 1992, No. 437, eff. 6-1-92; am. (5) and (8) (b) 3., Register, December, 1995, No. 480, eff. 1-1-96; am. (8) (b), Register, December, 1996, No. 492, eff. 1-1-97; CR 03-066: am. (2) (a) 1. and 2. and (b), (5) and (6), cr. (5) (b) Register May 2005 No. 593, eff. 6-1-05; CR 07-082: am. (8), cr. (9) Register September 2009 No. 645, eff. 10-1-09; CR 09-088: cr. (5) (c), (7) (a) and (b), renum. (7) to be (7) (intro.) and am. Register May 2010 No. 653, eff. 6-1-10; CR 07-082: r. (3) Register November 2011 No. 671, eff. 12-1-11; CR 15-033: am. (2) (a) (title), renum. (a) (intro.) to (a) and am., r. 1. and 2., r. and recr. (6) Register July 2016 No. 727, eff. 8-1-16.
NR 404.05 NR 404.05Ambient air increments.
NR 404.05(1) (1)Scope. The ambient air increments apply to all attainment areas of the state.
NR 404.05(2) (2)Class I increments. In any area of this state classified under the Act as a class I area, the ambient air increments for PM10, PM2.5, sulfur dioxide, and nitrogen dioxide may not exceed the following amounts:
NR 404.05(2)(a) (a) PM10 .
1. Annual arithmetic mean   4 micrograms per cubic meter
2. Twenty-four hour maximum   8 micrograms per cubic meter
NR 404.05(2)(am) (am) PM2.5 .
1. Annual arithmetic mean   1 microgram per cubic meter
2. Twenty-four hour maximum   2 micrograms per cubic meter
NR 404.05(2)(b) (b) Sulfur dioxide.
1. Annual arithmetic mean   2 micrograms per cubic meter
2. Twenty-four hour maximum   5 micrograms per cubic meter
3. Three hour maximum   25 micrograms per cubic meter
NR 404.05(2)(c) (c) Nitrogen dioxide.
1. Annual arithmetic mean   2.5 micrograms per cubic meter
NR 404.05(3) (3)Class II increments. In any area of this state classified under the Act as a class II area, the ambient air increments for PM10, PM2.5, sulfur dioxide, and nitrogen dioxide may not exceed the following amounts:
NR 404.05(3)(a) (a) PM10 .
1. Annual arithmetic mean   17 micrograms per cubic meter
2. Twenty-four hour maximum   30 micrograms per cubic meter
NR 404.05(3)(am) (am) PM2.5 .
1. Annual arithmetic mean   4 micrograms per cubic meter
2. Twenty-four hour maximum   9 micrograms per cubic meter
NR 404.05(3)(b) (b) Sulfur dioxide.
1. Annual arithmetic mean   20 micrograms per cubic meter
2. Twenty-four maximum   91 micrograms per cubic meter
3. Three hour maximum   512 micrograms per cubic meter
NR 404.05(3)(c) (c) Nitrogen dioxide.
1. Annual arithmetic mean   25 micrograms per cubic meter
NR 404.05(4) (4)Class III increments. In any area of this state classified under the Act as a class III area, the ambient air increments for PM10, PM2.5, sulfur dioxide, and nitrogen dioxide may not exceed the following amounts:
NR 404.05(4)(a) (a) PM10 .
1. Annual arithmetic mean   34 micrograms per cubic meter
2. Twenty-four hour maximum   60 micrograms per cubic meter
NR 404.05(4)(am) (am) PM2.5 .
1. Annual arithmetic mean   8 micrograms per cubic meter
2. Twenty-four hour maximum   18 micrograms per cubic meter
NR 404.05(4)(b) (b) Sulfur dioxide.
1. Annual arithmetic mean   40 micrograms per cubic meter
2. Twenty-four hour maximum   182 micrograms per cubic meter
3. Three hour maximum   700 micrograms per cubic meter
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Published under s. 35.93, Stats. Updated on the first day of each month. Entire code is always current. The Register date on each page is the date the chapter was last published.