Overview
- A field campaign led by INECC in October 2025 recorded 42,587 vehicle emissions measurements at seven sites in the Área Metropolitana de Guadalajara to evaluate the verification program.
- Jalisco carried out 1,172,094 vehicle verifications in 2025 after tying compliance to payment of the state refrendo and offering free tests for local plates, a policy change officials credit with boosting uptake.
- SEMADET reported a 66% drop in pollution episodes and a 91% fall in ozone precontingencies when comparing the first half of 2025 with the same period in 2026, and no ozone contingencies were recorded.
- Analysis from OPD AIRE and INECC found that poor maintenance, not vehicle age, determines emissions levels and that badly maintained cars can pollute up to six times more than verified, well‑kept vehicles.
- Authorities warn that sustaining and deepening gains will require continued citizen participation, routine vehicle maintenance, active enforcement of verification rules, and incentives to keep tests accessible.