AIR QUALITY

17.8.1807 NOTICE OF LOCATION Unless the owner or operator of a facility required to be registered under this subchapter has previously submitted the location of a facility under ARM 17.8.1805(4), the owner or operator shall submit to the department a notice of location for each f…

17.8.1810 DEREGISTRATION The department may deregister a facility: on written request of the owner or operator, or for a violation of this chapter. To deregister a facility under (1)(b), the department shall notify the owner or operator in writing of its intent to deregister by c…

17.8.1811 RECORDKEEPING AND REPORTING An owner or operator of a facility required to be registered under this subchapter shall make records that include: the location at which the facility was operated; daily production rates and rolling 12-month total production in the units use…

17.8.1812 REQUIREMENTS FOR CONCRETE BATCH PLANTS Except as provided in (2), an owner or operator of a concrete batch plant required to be registered under this subchapter shall control particulate emissions from the facility at all times during operation using: a fabric filter du…

17.8.1815 REQUIREMENTS FOR ASPHALT PLANTS An owner or operator of an asphalt plant required to register under this subchapter: shall limit particulate matter emissions to no more than: 0.04 grains per dry standard cubic foot; or 0.10 grains per dry standard cubic foot, for a faci…

17.8.201 DEFINITIONS In this subchapter, the following words and phrases shall have the following meanings: "Act" means the Montana Clean Air Act. "Administrator," as used in 40 CFR Part 58, means the department. "Ambient air quality standards" means a permissible level of an air…

17.8.202 INCORPORATION BY REFERENCE For the purposes of this subchapter, the department adopts and incorporates by reference the following: The Montana Ambient Air Monitoring Program Quality Assurance Project Plan (2023), a department manual that specifies ambient air sampling an…

17.8.204 AMBIENT AIR MONITORING The requirements of this rule apply to any ambient air monitoring performed by the department or any other entity that is: required by this chapter; used to demonstrate compliance with this chapter; submitted in an application for, or to comply wit…

17.8.205 ENFORCEABILITY Any person who violates any provision of this subchapter shall be subject to the enforcement provisions of the Act. Except as otherwise provided in this subchapter, the ambient air quality standards are applicable throughout the state of Montana. Authorizi…

17.8.206 METHODS AND DATA (REPEALED) Authorizing statute(s): 75-2-111, 75-2-202, MCA Implementing statute(s): 75-2-202, MCA History: NEW, 1980 MAR p. 2399, Eff. 8/15/80; AMD, 1986 MAR p. 2007, Eff. 12/12/86; AMD, 1989 MAR p. 2059, Eff. 12/8/89; AMD, 1992 MAR p. 144, Eff. 1/31/92;…

17.8.210 AMBIENT AIR QUALITY STANDARDS FOR SULFUR DIOXIDE No person shall cause or contribute to concentrations of sulfur dioxide in the ambient air which exceed any of the following standards: hourly average: 0.50 ppm, one-hour average, not to be exceeded more than 18 times in a…

17.8.211 AMBIENT AIR QUALITY STANDARDS FOR NITROGEN DIOXIDE No person shall cause or contribute to concentrations of nitrogen dioxide in the ambient air which exceed any of the following standards: hourly average: 0.30 ppm, one-hour average, not to be exceeded more than once per …

17.8.212 AMBIENT AIR QUALITY STANDARDS FOR CARBON MONOXIDE No person shall cause or contribute to concentrations of carbon monoxide in the ambient air which exceed any of the following standards: Hourly average: 23 ppm, hourly average, not to be exceeded more than once per year. …

17.8.213 AMBIENT AIR QUALITY STANDARD FOR OZONE No person shall cause or contribute to concentrations of ozone in the ambient air which exceed the following standard: hourly average: 0.10 ppm one-hour average, not to be exceeded more than once per year. For determining compliance…

17.8.214 AMBIENT AIR QUALITY STANDARD FOR HYDROGEN SULFIDE No person shall cause or contribute to concentrations of hydrogen sulfide in the ambient air which exceed the following standard: hourly average: 0.05 ppm, one-hour average, not to be exceeded more than once per year. Mea…

17.8.220 AMBIENT AIR QUALITY STANDARD FOR SETTLED PARTICULATE MATTER No person shall cause or contribute to concentrations of particulate matter in the ambient air such that the mass of settled particulate matter exceeds the following standard: thirty-day average: 10 gm/m 2 , 30-…

17.8.221 AMBIENT AIR QUALITY STANDARD FOR VISIBILITY No person shall cause or contribute to concentrations of particulate matter such that the scattering coefficient of particulate matter in the ambient air exceeds the following standard: annual average: 3 x 10 -5 per meter, annu…

17.8.222 AMBIENT AIR QUALITY STANDARD FOR LEAD No person shall cause or contribute to concentrations of lead in the ambient air which exceed the following standard: ninety-day average: 1.5 µg/m 3 of air, 90-day average, not to be exceeded. For determining compliance with this rul…

17.8.223 AMBIENT AIR QUALITY STANDARD FOR PM-10 No person may cause or contribute to concentrations of PM-10 in the ambient air which exceed the following standards: Twenty-four hour average: 150 µg/m 3 of air, 24-hour average, with no more than one expected exceedance per calend…

17.8.230 FLUORIDE IN FORAGE No person may cause or contribute to concentrations of fluoride in or on forage which exceed the following standards: monthly average: 50 µg/g. grazing season average: 35 µg/g. The following sampling protocol must be applied: A sample plot must be loca…

17.8.301 DEFINITIONS For purposes of this subchapter, the following definitions apply: "112(g) exemption" means a document issued by the department on a case-by-case basis, finding that a major source of HAP meets the criteria contained in 40 CFR 63.41 (definition of "construct a…

17.8.302 INCORPORATION BY REFERENCE For the purposes of this subchapter, the department adopts and incorporates by reference the following: 40 CFR Part 60, pertaining to standards of performance for new stationary sources and modifications, with the following exceptions: 40 CFR 6…

17.8.304 VISIBLE AIR CONTAMINANTS No person may cause or authorize emissions to be discharged into the outdoor atmosphere from any source installed on or before November 23, 1968, that exhibit an opacity of 40% or greater averaged over six consecutive minutes. The provisions of t…

17.8.308 PARTICULATE MATTER, AIRBORNE No person shall cause or authorize the production, handling, transportation, or storage of any material unless reasonable precautions to control emissions of airborne particulate matter are taken. Such emissions of airborne particulate matter…

17.8.309 PARTICULATE MATTER, FUEL BURNING EQUIPMENT No person shall cause or authorize particulate matter caused by the combustion of fuel to be discharged from any stack or chimney into the outdoor atmosphere in excess of the rates in the following table: Maximum Allowable Emiss…

17.8.310 PARTICULATE MATTER, INDUSTRIAL PROCESSES No person shall cause or authorize particulate matter to be discharged, from any operation, process or activity, into the outdoor atmosphere in excess of the amount shown in the following table: When the process weight rate falls …

17.8.315 ODORS (REPEALED) Authorizing statute(s): 75-2-111, 75-2-203, MCA Implementing statute(s): 75-2-203, MCA History: Eff. 12/31/72; AMD, Eff. 9/5/75; AMD, 1993 MAR p. 2530, Eff. 10/29/93; TRANS, from DHES, 1996 MAR p. 2285; REP, 2001 MAR p. 976, Eff. 6/8/01.

17.8.316 INCINERATORS An incinerator may not be used to burn solid or hazardous waste unless the incinerator is a multiple chamber incinerator or has a design of equal effectiveness approved by the department prior to installation or use. A person may not cause or authorize to be…

17.8.320 WOOD-WASTE BURNERS It is hereby declared to be the policy of the department to encourage the complete utilization of wood-waste residues and to restrict, wherever reasonably practical, the disposal of wood-waste residues by combustion in wood-waste burners. Recent techno…

17.8.321 KRAFT PULP MILLS For the purposes of this rule, the following definitions apply: "Continual monitoring" means sampling and analysis, in a continuous or times sequence, using techniques which will adequately reflect actual emission levels or concentrations on a continuous…

17.8.322 SULFUR OXIDE EMISSIONS--SULFUR IN FUEL "Btu" means British thermal unit which is the heat required to raise the temperature of one pound of water through one Fahrenheit degree. Commencing July 1, 1970, no person shall burn liquid or solid fuels containing sulfur in exces…

17.8.323 SULFUR OXIDE EMISSIONS--PRIMARY COPPER SMELTERS (REPEALED) Authorizing statute(s): 75-2-111, 75-2-203, MCA Implementing statute(s): 75-2-203, MCA History: Eff. 12/31/72; AMD, 1981 MAR p. 203, Eff. 3/13/81; TRANS, from DHES, 1996 MAR p. 2285; REP, 2001 MAR p. 560, Eff 4/6…

17.8.324 HYDROCARBON EMISSIONS--PETROLEUM PRODUCTS No person shall place, store or hold in any stationary tank, reservoir or other container of more than 65,000 gallons capacity any crude oil, gasoline or petroleum distillate having a vapor pressure of 2.5 pounds per square inch …

17.8.325 MOTOR VEHICLES No person shall intentionally remove, alter or otherwise render inoperative, exhaust emission control, crank case ventilation or any other air pollution control device which has been installed as a requirement of federal law or regulation. No person shall …

17.8.326 PROHIBITED MATERIALS FOR WOOD OR COAL RESIDENTIAL STOVES No person may cause or authorize the use of the following materials to be combusted in any residential solid-fuel combustion device such as a wood, coal, or pellet stove or fireplace: food wastes; Styrofoam and oth…

17.8.330 EMISSION STANDARDS FOR EXISTING ALUMINUM PLANTS--DEFINITIONS For the purposes of this rule, the following definitions apply: "Aluminum manufacturing" means the electrolytic reduction of alumina (aluminum oxide) to aluminum. "Emission" means a release into the outdoor atm…

17.8.331 EMISSION STANDARDS FOR EXISTING ALUMINUM PLANTS--STANDARDS FOR FLUORIDE No owner or operator subject to the provisions of this rule may cause the emission into the atmosphere from any existing primary aluminum reduction plant of any gasses which contain total fluorides i…

17.8.332 EMISSION STANDARDS FOR EXISTING ALUMINUM PLANTS--STANDARD FOR VISIBLE EMISSIONS No owner or operator subject to this rule may cause the emission into the atmosphere from any potroom group of any gasses or particles which exhibit 10% opacity or greater, as determined by E…

17.8.333 EMISSION STANDARDS FOR EXISTING ALUMINUM PLANTS--MONITORING AND REPORTING For the purpose of this rule the department adopts and incorporates by reference 40 CFR 60.195 which sets forth test methods and procedures for primary aluminum reduction plants. A copy of this inc…

17.8.334 EMISSION STANDARDS FOR EXISTING ALUMINUM PLANTS--STARTUP AND SHUTDOWN (REPEALED) Authorizing statute(s): 75-2-111, 75-2-203, MCA Implementing statute(s): 75-2-203, MCA History: NEW, 1982 MAR p. 390, Eff. 2/26/82; TRANS, from DHES, 1996 MAR p. 2285; REP, 2016 MAR p. 512, …

17.8.335 MAINTENANCE OF AIR POLLUTION CONTROL EQUIPMENT FOR EXISTING ALUMINUM PLANTS (REPEALED) Authorizing statute(s): 75-2-111, MCA Implementing statute(s): 75-2-203, MCA History: NEW, 2002 MAR p. 2189, Eff. 8/16/02; AMD, 2005 MAR p. 321, Eff. 2/25/05; REP, 2016 MAR p. 512, Eff…

17.8.340 STANDARD OF PERFORMANCE FOR NEW STATIONARY SOURCES AND EMISSION GUIDELINES FOR EXISTING SOURCES For the purpose of this rule, the following definitions apply: "Administrator", as used in 40 CFR Part 60, means the department, except in the case of those duties which canno…

17.8.341 EMISSION STANDARDS FOR HAZARDOUS AIR POLLUTANTS For the purpose of this rule, the terms and associated definitions specified in 40 CFR 61.02, shall apply, except that: "Administrator", as used in 40 CFR Part 61, means the department, except in the case of those duties wh…

17.8.342 EMISSION STANDARDS FOR HAZARDOUS AIR POLLUTANTS FOR SOURCE CATEGORIES The owner or operator of any affected source, as defined and applied in 40 CFR Part 63, shall comply with the requirements of 40 CFR Part 63, incorporated by reference in ARM 17.8.302. All references i…

17.8.401 DEFINITIONS In this subchapter, the following definitions apply: The following apply to the definition of the term "dispersion technique": "Dispersion technique" means any technique which attempts to affect the concentration of a pollutant in the ambient air by: using th…

17.8.402 REQUIREMENTS The degree of emission limitation required of any source or stack for control of any air pollutant regulated under the Clean Air Act of Montana may not be affected by so much of any source's stack height that exceeds good engineering practice or by any other…

17.8.403 EXEMPTIONS The requirements of ARM 17.8.402 do not apply to stack heights in existence or dispersion techniques implemented on or before December 31, 1970, except when pollutants are being emitted from such stacks or using such dispersion techniques by stationary sources…