The Doble Hoy No Circula and Phase 1 Contingencia Ambiental remain suspended for Monday, September 21, 2026, in Mexico City and the State of Mexico, according to official reports from the Comisión Ambiental de la Megalópolis (CAMe) and the Dirección de Monitoreo Atmosférico.
Standard Hoy No Circula Rules for Monday, September 21, 2026
Because the emergency contingency phase is currently inactive, standard restrictions under the Hoy No Circula program govern traffic from 05:00 to 22:00 hours on Monday, September 21, 2026, as established by the Secretaría del Medio Ambiente (SEDEMA). Vehicles carrying yellow environmental tags (engomado amarillo) along with license plates ending in 5 or 6 cannot circulate during this period. Additionally, vehicles bearing foreign plates face circulation limits between 05:00 and 11:00 in the morning.
Drivers operating vehicles with holograms 0 and 00 remain fully exempt from these regular restrictions, alongside hybrid and electric automobiles. SEDEMA guidelines also exempt tractors, mining and construction machinery, motorcycles, and vehicles with a gross weight of 400 kilograms or less. Classic or antique cars, cars with special permits for transporting disabled individuals, and vehicles displaying an “EXENTO” hologram also operate without standard limitations.
Did You Know? During a declared Fase I contingency, restrictions tighten significantly to include a complete ban on all Holograma 2 vehicles and specific pairings for Holograma 1, whereas standard weekly operations only target specific color tags and plate endings.
Air Quality Status and Monitoring in CDMX and Edomex
The latest updates from the Índice de Aire y Salud indicate that pollution levels linked to ozone in the Valley of Mexico prompted close monitoring by environmental authorities. While early September saw unexpected contingency activations—including rumors regarding industrial output from facilities like the Tula refinery—current readings show air quality returning to lower risk thresholds in the 16 alcaldías of Mexico City and conurbated municipalities of the State of Mexico.
CAMe and SEDEMA continuously evaluate data from the SIMAT monitoring network alongside meteorological forecasts to determine whether additional restrictions become necessary. When ozone levels surpass 150 points, the protocol triggers a Fase I Contingencia Ambiental, bringing the Doble Hoy No Circula into effect. However, because no such alert is active for Monday, drivers do not face the broader prohibitions that sideline additional 0 and 00 hologram categories.
Expert Insight: Managing air quality episodes in the Valley of Mexico requires balancing strict vehicular limitations with real-time meteorological data, as high solar radiation and low wind speeds during certain months routinely trap ozone pollutants close to the surface.
Frequently Asked Questions
Is the Doble Hoy No Circula active on Monday, September 21, 2026?
No. According to CAMe and SEDEMA, the emergency contingency and the Doble Hoy No Circula are suspended, meaning standard restrictions apply.
Which cars cannot drive on Monday, September 21, 2026?
Vehicles with yellow tags (engomado amarillo) and license plate endings 5 or 6 must stay off the road between 05:00 and 22:00 hours, according to SEDEMA. Foreign-plated cars face morning limits from 05:00 to 11:00.
Are electric and hybrid cars restricted under the normal program?
No. Electric vehicles, hybrid cars of categories I and II, and units carrying holograms 0 and 00 are exempt from the standard Hoy No Circula limitations.
What alternative transportation methods do you rely on when air quality alerts prompt stricter driving restrictions in the metropolitan area?