Mexico City was on the verge of implementing a serious environmental contingency known as the Double Hoy No Circula, as pollution levels rose significantly on February 11th. The Central Atmosphere Science Station in Coyoacán measured ozone levels at 156 parts per billion (ppb), exceeding the alert threshold of 150 ppb necessary for declaring a contingency. Reports indicated that the pollution had reached concerning levels, indicating a potential health risk for the inhabitants of the region.

However, the Comisión Ambiental de la Megalópolis (CAMe) decided against activating the Double Hoy No Circula due to a fortunate change in weather conditions. A current of wind and increased cloud cover helped to disperse the pollutants, rapidly lowering concentration levels and thus eliminating the immediate threat of serious air quality issues. The decision reflected the dynamic nature of environmental management and the influence of natural factors on air quality assessments in urban settings.

Although the immediate crisis was averted, the event raised questions about how decisions are made regarding air quality measures and the thresholds used by authorities. Residents may want to understand the influences of variable weather patterns on pollution levels, and how such events could shape future environmental policies. As climate change continues to impact weather, the robustness of air quality regulations and response strategies will be vital in protecting public health in densely populated areas like Mexico City and the State of Mexico.