Overview
- The Megalopolis Environmental Commission (CAMe) activated a Phase 1 regional contingency for Iztapalapa, Milpa Alta, Tláhuac and Xochimilco, plus 13 Estado de México municipalities.
- A PM2.5 reading of 107.3 µg/m³ at 08:00 at the Santiago Acahualtepec monitor in Iztapalapa triggered the declaration.
- Authorities cited fireworks and the burning of materials as primary sources, compounded by low winds, cold temperatures and a thermal inversion that trapped pollutants.
- Health guidance urges residents to avoid outdoor exercise, keep windows closed, use air conditioning on recirculation and refrain from indoor burning or smoking.
- Operational measures include a 40% cut to industrial particulate emissions and suspension of construction, concretes and artisan kilns, while Hoy No Circula remains normal pending CAMe’s 3 p.m. reassessment that could add vehicle restrictions.