The specialists of the National Meteorological Service reported that, during the 2025 ozone season, lower atmospheric concentrations are expected than those recorded in 2024. The population is warned to be alert for a possible activation of the environmental contingency in the Mexico Valley, as well as to avoid actions that may contribute to pollution, such as burnings and indiscriminate use of cars.
Fabián Vázquez Romana, coordinator of the National Meteorological Service, indicated that in the last decade, more intense and prolonged heat waves have been experienced in Mexico City. These phenomena are usually caused by high-pressure systems that trap heat near the surface and limit air circulation. During 2024, three consecutive heat waves occurred in Mexico City, reaching record temperatures, such as the 34.7 degrees Celsius recorded between May 16 and May 26.
On the other hand, the Hoy No Circula program in Mexico City will remain in effect for Thursday, February 20. During the ozone season in the Metropolitan Area of the Mexico Valley, measures will be taken to reduce pollutant emissions. Víctor Hugo Páramo Figueroa, executive coordinator of the Environmental Commission of the Megalopolis, mentioned that this season is characterized by the presence of high-pressure systems that generate clear days, intense solar radiation, and weak winds, leading to ozone accumulation.
It is estimated that during 2025, there will be between three and eleven days of high ozone concentration in the region, which could lead to the activation of Phase 1 of the environmental contingency and, therefore, the implementation of the Double Hoy No Circula program in Mexico City. Authorities expect these levels not to exceed 154 ppb of ozone molecules, so vehicles with green stickers, plates ending in 1 and 2, and holograms 1 or 2 must refrain from circulating.
So far, no alerts have been issued for poor air quality, nor has Phase 1 of the environmental contingency been activated. The measures of the Hoy No Circula program apply in the 16 boroughs of Mexico City and 59 neighboring municipalities in the State of Mexico, where more than 5 million vehicles circulate. For the current year, it is estimated that there will be between 4 and 5 heat waves lasting an average of 6 to 7 days, characterized by exceptionally high temperatures, clear skies, and low humidity. Given this forecast, it is likely that the double Hoy No Circula program will be activated in Mexico City during the heat season.
