Overview
- The State of Mexico activated Phase 1 on December 25 for the Valle de Toluca and Santiago Tianguistenco metropolitan zones after hazardous fine particulate levels.
- Official monitors reported peak PM2.5 of 84 and 82 µg/m³ around 11:00 at Almoloya de Juárez and Xonacatlán, indicating elevated health risk.
- Authorities linked the surge to Nochebuena fireworks and bonfires combined with unfavorable dispersion conditions caused by a thermal inversion.
- Health guidance urges sensitive groups to remain indoors, avoid vigorous outdoor activity, keep windows closed, and seek medical advice if respiratory symptoms occur.
- For December 26 from 5:00 to 22:00, restrictions include: no circulation for Hologram 2; Hologram 1 plates ending 1, 3, 4, 5, 7, 9; Hologram 0/00 blue sticker plates 9 and 0; a 50% cut to LP gas units without a dry disconnect valve; cargo limits from 6:00 to 10:00 with exceptions; taxis allowed 5:00 to 10:00; officials will issue updates at 15:00 and 20:00 and may apply Doble Hoy No Circula if poor air persists.