Emissions Testing in the St. Louis Region

Important Message

Effective July 1, 2022, vehicles registered in Franklin County no longer need an emissions inspection for vehicle registration. On Jan. 27, 2022 the Missouri Air Conservation Commission adopted an amendment to 10 CSR 10-5.381 “Onboard Diagnostics Motor Vehicle Emissions Inspection.” 10 CSR 10-5.381 identifies which vehicles are subject to emissions testing requirements and the amended regulation exempts vehicles registered in Franklin County from emissions inspection requirements. Vehicles registered in the City of St. Louis, and the counties of St. Charles, St. Louis and Jefferson are still subject to emissions inspection requirements. Further details for Franklin County motorists and inspection stations is available on the Gateway Vehicle Inspection Program Frequently Asked Questions - Termination of Vehicle Emission Testing Requirements for Franklin County Residents fact sheet.

If you have questions or concerns, please reach out to:

The Gateway Vehicle Inspection Program: Phone: 314-416-2115, Email: imunit@dnr.mo.gov
Or the Air Pollution Control Program: Phone: 573-751-4817, Email: apcp.receptionist@dnr.mo.gov

Important Message

As a result of an increase in the number of inspector/mechanics interested in emissions inspector training, there will be an additional training class held in the months of August, September, October, and November 2022. The training classes will take place from 5-9 p.m. on the second and fourth Tuesdays of the month in Room G108-109 of Gray Building located at Ranken Technical College, 4431 Finney Ave., St. Louis. Look for signs on campus on the day of training. Find the building located on the campus map.

Register for class by calling 877-832-7664 and pressing number 3. Be prepared to provide your name, contact information, social security number, driver's license number and the I/M number and station number, if applicable. Bring a photo ID, such as your driver's license, to receive training and take the test. You must be able to read to attend this training. Below are the dates for 2022. For results from the training exam call Missouri State Highway Patrol at 314-416-2180 ext. 7.