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
NR 404.05(4)(c) (c) Nitrogen dioxide.
1. Annual arithmetic mean   50 micrograms per cubic meter
NR 404.05(5) (5)Exception for non-annual concentrations. Notwithstanding subs. (2) (intro.), (3) (intro.) and (4) (intro.), the ambient air increment of an air contaminant based on concentrations for any period other than an annual period may be exceeded during one such period per year.
NR 404.05(6) (6)Maximum concentration. The maximum allowable concentration of any air contaminant in any attainment area may not exceed a concentration for such contaminant for each period of exposure equal to the maximum concentrations permitted under the primary or secondary air standards in s. NR 404.04.
NR 404.05 History History: Cr. Register, April, 1983, No. 238, eff. 5-1-83; renum. from NR 155.035, Register, July, 1985, No. 355, eff. 8-1-85; renum. from NR 404.04, Register, September, 1986, No. 369, eff. 10-1-86; am. (2) (intro.), (3) (intro.) and (4) (intro.), cr. (2) (c), (3) (c) and (4) (c), Register, May, 1992, No. 437, eff. 6-1-92; am. (2) (intro.), (a), (3) (intro.), (a), (4) (intro.), (a), Register, April, 1995, No. 472, eff. 5-1-95; am. (3) (intro.) and (4) (intro.), Register, December, 1996, No. 492, eff. 1-1-97; CR 15-077: am. (2) (intro.), cr. (2) (am), am. (3) (intro.), cr. (3) (am), am. (4) (intro.), cr. (4) (am) Register July 2016 No. 727, eff. 8-1-16.
NR 404.06 NR 404.06Measurement of ambient air quality.
NR 404.06(1)(1)Applicability.
NR 404.06(1)(a)(a) The department and any person conducting ambient air quality monitoring on its behalf shall use only reference or equivalent methods as specified in sub. (2) or (3) for all ambient air quality monitoring for any air contaminant identified in s. NR 404.04. The ambient monitoring shall conform with the department's guidebooks, plans and procedures for air monitoring quality assurance.
NR 404.06(1)(b) (b) Any person required by the department to conduct ambient air quality monitoring shall use only reference or equivalent methods for sampling and analysis as specified in sub. (2) or (3) and shall comply with quality assurance and quality control procedures and the data reporting format which are specified and approved by the department for the collection, analysis, processing and reporting of ambient air quality monitoring data.
NR 404.06(1)(c) (c) Any person who voluntarily conducts ambient air quality monitoring in Wisconsin may request the department to determine that the data being collected are comparable to the air quality data collected under par. (a) or (b). The department may determine that the data are comparable if the voluntary ambient air quality monitoring and the data meet the requirements specified in par. (b).
NR 404.06(1)(d) (d) The department may determine that air quality data submitted to the department for purposes of demonstrating compliance with existing regulations under chs. NR 400 to 499 or in support of a permit or permit application are unacceptable if such monitoring was not conducted in compliance with pars. (a) to (c).
NR 404.06(2) (2)Reference methods. Ambient air quality monitoring which utilizes a reference monitoring method shall use monitoring methods which conform to the federal reference methods which are specified in 40 CFR part 50, Appendices A to T, incorporated by reference in s. NR 484.04 (2), or which have been so designated by the department.
NR 404.06(3) (3)Equivalent methods.
NR 404.06(3)(a)(a) Ambient air quality monitoring which utilizes an equivalent monitoring method shall use monitoring methods which have been published by the department under sub. (4) (a).
NR 404.06(3)(b) (b) The department may list a monitoring method as an equivalent method if the department determines that the method satisfies the same requirements for a federal equivalent method as specified in 40 CFR part 53, incorporated by reference in s. NR 484.03.
NR 404.06(3)(c) (c) The department shall maintain a list of equivalent methods and shall send a copy of the list to any person upon request. A current copy of the list shall be available for inspection or copying at the department's headquarters office.
NR 404.06 Note Note: The department's headquarters office is located at 101 South Webster Street, Madison, Wisconsin. Mail requests should be addressed to the Department of Natural Resources, Bureau of Air Management, PO Box 7921, Madison WI 53707.
NR 404.06(4) (4)Air quality publications. The department shall publish documents relating to air quality or to air monitoring, including the following:
NR 404.06(4)(a) (a) The department shall publish or revise a list of equivalent monitoring methods as specified in sub. (3).
NR 404.06(4)(b) (b) The department shall publish, revise and maintain quality assurance plans and guidebooks which describe the activities and procedures of the quality assurance and quality control systems.
NR 404.06(4)(c) (c) The department shall publish reports on air quality and related information and data.
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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.