Governing Law and Regulations
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 requires an air quality permit be obtained from DEQ for the construction, installation, and operation of sources meeting the applicability criteria, unless specifically excluded by the regulations. Air quality permits authorize the construction and operation of a source and do not have an established expiration date. In addition, major sources are required to comply with the applicable provisions of nonattainment NSR and/or PSD depending on the type and quantity of emissions and the attainment status of the ...