Air quality in Mexico City and the State of Mexico improved, preventing a new ozone contingency activation amid a heat wave. At 3 p.m., only the Tlalpan station reported poor quality, Cuajimalpa good, and the rest acceptable. The Megalopolis Environmental Commission (CAMe) lifted the weekend contingency and keeps alerts for atmospheric stability conditions.
The phase 1 environmental contingency, lifted on Sunday, was not reactivated on Monday despite high pollution levels from a heat wave and anticyclonic system favoring ozone buildup.
The Hoy No Circula program applied normally on Tuesday, April 28, from 5 a.m. to 10 p.m. for vehicles with pink sticker and plate endings 7 or 8. Exemptions include motorcycles, electric vehicles, hybrid category I and II, 00 and 0 holograms, among others.
This marks the sixth contingency in 2026 in the Valley of Mexico, prior ones due to PM2.5 and ozone. CAMe forecasts atmospheric stability, weak winds, and temperatures above 30°C for the week of April 27 to May 1.
CAMe advised reducing emissions: limit car use, refuel gasoline outside peak hours, avoid aerosols and solvents, shorten showers, and repair gas leaks.
