Air Pollution Control Program
Inspection and Maintenance
The Department of Natural Resources launched the Gateway Vehicle Inspection Program on Oct. 1, 2007. The Gateway Vehicle Inspection Program, the department's vehicle inspection and maintenance program, or I/M, is part of the ongoing effort to improve air quality in St. Louis City and St. Louis, St. Charles, Jefferson and Franklin counties. Under the state's federally required plan to reduce pollution, vehicles registered in these areas must have an emissions test as part of their licensing requirements.
Vehicles release carbon dioxide, carbon monoxide, hydrocarbons and oxides of nitrogen through their tailpipes. Hydrocarbons and oxides of nitrogen can react on hot, sunny days to form ground-level ozone, or smog. Ozone poses health risks, especially for people with respiratory problems, and damages certain species of trees.
The Gateway Vehicle Inspection Program is jointly administered by the Missouri Department of Natural Resources and the Missouri State Highway Patrol.
For more information about the vehicle emissions test, please visit Gateway Vehicle Inspection Program or call 314-416-2115.