Mississippi Truck Emissions & Clean-Truck Rules
Mississippi has no emissions inspection, and it repealed its safety inspection sticker too. Nothing here tests your truck's exhaust. Your diesel runs under federal EPA engine standards only (40 CFR Part 86). The state has not adopted California's Advanced Clean Trucks rule, so there's no ZEV mandate touching an out-of-state rig. Keep the DPF and DEF/SCR working and DEF topped off; tampering is a federal offense with steep civil penalties.
How Mississippi handles truck emissions
Mississippi has no emissions inspection, and it repealed its safety inspection sticker too. Nothing here tests your truck's exhaust. Your diesel runs under federal EPA engine standards only (40 CFR Part 86). The state has not adopted California's Advanced Clean Trucks rule, so there's no ZEV mandate touching an out-of-state rig. Keep the DPF and DEF/SCR working and DEF topped off; tampering is a federal offense with steep civil penalties.
What applies to you
- Program: Federal EPA only
- State rule: Federal EPA standards only. Mississippi has no state emissions inspection and no longer runs a safety inspection; no heavy-truck emissions program exists. It has not adopted California's Advanced Clean Trucks rule.
- Penalty: No state emissions fine. Federal EPA anti-tampering penalties apply: roughly $45,000+ per tampered engine and about $4,500 per defeat device sold or installed (Clean Air Act).
- DPF / DEF: Federal EPA equipment nationwide, never delete or tamper with it
Mississippi Emissions FAQ
Does Mississippi have a truck emissions program?
What is the emissions rule for trucks in Mississippi?
What is the penalty for an emissions violation in Mississippi?
Reference information for planning, not legal advice. Traffic laws change and this can be out of date, so always confirm the current statute and obey posted signs before you rely on it. Last reviewed July 2026. Source: https://www.epa.gov/enforcement/national-enforcement-and-compliance-initiative-stopping-aftermarket-defeat-devices. See our Terms & Disclaimer.
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