Montana Hazardous Air Pollutants regulations & environmental compliance analysis

Montana Hazardous Air Pollutants: What you need to know

Governing Law and Regulations

National Emissions Standards for Hazardous Air Pollutants (NESHAPs): 40 CFR 61, 40 CFR 63, Administrative Rules of Montana (ARM) 17.8.103(1), ARM 17.8.302, ARM 17.8.802, ARM 17.8.902, ARM 17.8.1002, and ARM 17.8.1502

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Mercury emissions: ARM 17.8.771 and ARM 17.8.772

Regulatory Agency

Montana Department of Environmental Quality (DEQ) Permitting and Compliance Division Air Resources Management Bureau

See ADDRESSES & CONTACTS for addresses and telephone numbers.

See national section for basic information and federal regulations.

Comparison: State vs. Federal

Rules. Montana has no additional state-listed hazardous air pollutants. Montana has adopted regulations to control mercury emissions from electric generating units. The federal NESHAP rules, including the source-specific NESHAPs, also known as the maximum achievable control technology standards, have been incorporated by reference into the Montana regulations. See the national section HAZARDOUS AIR POLLUTANTS for more information.

Administration and enforcement. DEQ administers and enforces its own air quality management program.

State Requirements


ARM 17.8.771 and ARM 17.8.772

Montana has regulations to control mercury emissions from electric generating units.


Montana has promulgated standards to control mercury emissions from any emitting unit at a facility that requires an air quality permit, generates electricity and combusts coal, coal refuse, or a synthetic gas derived from coal, and that is defined as an electrical generating unit under 40 CFR 60.24.

Emissions Limits

Any mercury-emitting generating unit that is seeking to obtain an air quality permit must install the best available control ...

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