Missouri
For Missouri, counties where testing is required is St. Louis City St. Louis County St. Charles County Jefferson County; vehicles covered / exempt is Gas-powered vehicles 1996 and newer or diesel powered vehicles 1997 and newer; program / authority is Gateway VIP, verified against its source on 2026-08-19.
- State
- Missouri our reading
- Counties where testing is required
- St. Louis City St. Louis County St. Charles County Jefferson County verified
- Vehicles covered / exempt
- Gas-powered vehicles 1996 and newer or diesel powered vehicles 1997 and newer verified
- Program / authority
- Gateway VIP verified
- How often
- Odd vehicle model years test in odd years. Even vehicle model years test in even year. per gatewayvip.mo.gov
Values marked our reading are our classification of what the source says — the source does not print them in those words. The quote below is the evidence for each one; judge it yourself.
What the source says
Gas-powered vehicles 1996 and newer or diesel powered vehicles 1997 and newer 8,500 pounds or less. Registered in the following areas: <https://gatewayvip.mo.gov/locate-a-gvip-station-near-you/> Locate a GVIP Station near you St. Louis City St. Louis County St. Charles County Jefferson County When do I get a test?
— gatewayvip.mo.gov, retrieved 2026-08-19
What gatewayvip.mo.gov says
Odd vehicle model years test in odd years. Even vehicle model years test in even year.
— gatewayvip.mo.gov, retrieved 2026-08-19
Source
- gatewayvip.mo.govhttps://gatewayvip.mo.gov/need-test/