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)(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 HistoryHistory: 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 404.04NR 404.04 Ambient 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)(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(5)(d)(d) 0.070 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 4th-highest daily maximum 8-hour average ozone concentration is less than or equal to 0.070 ppm, as determined under 40 CFR part 50, Appendix U, incorporated by reference under s. NR 484.04 (7s). NR 404.04 NoteNote: The department promulgates ozone standards in response to federally promulgated ozone standards, and pursuant to its statutory obligation under s. 285.21 (1) (a), Stats., pars. (a) and (b) reflect standards from 1979 and 1997. They are included here to conform to the federal standards in 40 CFR part 50, where they are also included. 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)(a)(a) The primary and secondary standards for PM10 are 150 micrograms per cubic meter (µg/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 µg/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)(am)1.1. The primary standards for PM2.5 are 12.0 micrograms per cubic meter (µg/m3) — annual arithmetic mean concentration and 35 µg/m3 — 24-hour average concentration, measured in the ambient air as PM2.5 by either of the following methods: NR 404.04(9)(am)2.2. The primary annual standard is met when the annual arithmetic mean concentration, as determined in accordance with 40 CFR part 50, Appendix N, is less than or equal to 12.0 µg/m3. NR 404.04(9)(am)3.3. The primary 24-hour standard is met when the 98th percentile 24-hour concentration, as determined in accordance with 40 CFR part 50, Appendix N, is less than or equal to 35 µg/m3. NR 404.04(9)(bm)1.1. The secondary standards for PM2.5 are 15.0 µg/m3 annual arithmetic mean concentration and 35 µg/m3 24-hour average concentration, measured in the ambient air as PM2.5 by either of the following methods: NR 404.04(9)(bm)2.2. The secondary annual standard is met when the annual arithmetic mean concentration, as determined in accordance with 40 CFR part 50, Appendix N, is less than or equal to 15.0 µg/m3. NR 404.04(9)(bm)3.3. The secondary 24-hour standard is met when the 98th percentile 24-hour concentration, as determined in accordance with 40 CFR part 50, Appendix N, is less than or equal to 35 µg/m3. NR 404.04 NoteNote: 40 CFR part 50, Appendices L and N are incorporated by reference in s. NR 484.04 (6g) and (6r), respectively. NR 404.04 HistoryHistory: 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; CR 16-041: am. (9) (title), cr. (9) (am) (title), consol. (9) (a) (intro.), 1., 2. and renum. to (9) (am) 1. (intro.) and am., cr. (9) (am) 1. a., b., consol. (9) (b) (intro.), 1. and renum. to (9) (am) 2. and am., renum. (9) (b) 2. to (9) (am) 3. and am., cr. (9) (bm), r. (9) (c) Register December 2017 No. 744, eff. 1-1-18; CR 21-022: cr. (5) (d) Register February 2022 No. 794, eff. 3-1-22. 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: 1. Annual arithmetic mean 4 micrograms per cubic meter
2. Twenty-four hour maximum 8 micrograms per cubic meter
1. Annual arithmetic mean 1 microgram per cubic meter
2. Twenty-four hour maximum 2 micrograms per cubic meter
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
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: 1. Annual arithmetic mean 17 micrograms per cubic meter
2. Twenty-four hour maximum 30 micrograms per cubic meter
1. Annual arithmetic mean 4 micrograms per cubic meter
2. Twenty-four hour maximum 9 micrograms per cubic meter
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
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: 1. Annual arithmetic mean 34 micrograms per cubic meter
2. Twenty-four hour maximum 60 micrograms per cubic meter
1. Annual arithmetic mean 8 micrograms per cubic meter
2. Twenty-four hour maximum 18 micrograms per cubic meter
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
