Overview
- CAMe maintained Phase I of the environmental contingency across the Mexico City metro area on Monday, keeping expanded driving restrictions under the double Hoy No Circula program in force.
- An hourly ozone maximum of 149 ppb was recorded at Ajusco Medio at 15:00 on Monday, after Sunday peaks of 158–157 ppb at Ajusco Medio and the CCA station triggered the latest reactivation.
- An anticyclonic pattern with dry, stable air, clear skies, weak winds and highs near 27–28 °C continues to favor ozone formation and limit dispersion.
- Authorities are reinforcing enforcement with checks on highly polluting vehicles, fines of 20–30 UMA for violations, bans on open burning, and suspensions of certain emission‑generating works and nonessential official vehicle use.
- Health guidance urges avoiding outdoor activity from 13:00 to 19:00, especially for children, older adults, pregnant people and those with respiratory or cardiovascular conditions, with another update expected later today.