Air Quality

MDT's Remediation and Assessment Section is responsible for determining project level air quality conformity of transportation projects for the NEPA process. For a list of Montana's PM-10, PM2.5 and CO non-attainment areas, along with a listing of local monitoring stations, please visit:

DEQ's Air Quality Monitoring website


Project Level CO Hot-Spot Determination Process
Project Level PM Quantitative Hot-Spot Determination Process




What's all that noise?

The Environmental Remediation and Assessment Section conducts noise analyses for all highway projects which involve significant changes in alignment, addition of travel lanes, or new roads on new alignments.

MDT's Noise Policy (updated August 4, 2021)


Growing Neighborhoods in Growing Corridors: Land Use Planning for Highway Noise (2008)
Traffic Noise in Montana: Community Awareness and Recommendations for a Rural State (2004)

For questions about traffic noise or to comment on the policy, please contact:

Joe Radonich | 406-444-9204