On March 19, 2025, the Comisión Ambiental de la Megalópolis (CAMe) announced that Phase 1 of the environmental contingency for ozone would remain active in Mexico City and the State of Mexico due to persistently poor air quality. Factors contributing to the ongoing issue include a high-pressure system that significantly hinders the dispersion of pollutants, creating hazardous levels of ozone in the atmosphere.
The CAMe issued a statement at 15:00 on the same day, emphasizing that the climatic conditions are especially adverse for pollutant dispersion. In a proactive measure to safeguard public health, authorities have strongly recommended that citizens avoid outdoor activities between the hours of 1 PM and 7 PM, when concentrations of harmful contaminants are expected to reach dangerous levels. This includes refraining from any civic, cultural, recreational, or physical exercise conducted outdoors.
To further mitigate air pollution, the 'Doble Hoy No Circula' program has been reinstated, affecting the 16 districts of Mexico City (CDMX) and several municipalities in the State of Mexico, including Ecatepec, Naucalpan, and Tlalnepantla. Under these restrictions, certain vehicles are prohibited from circulating based on their verification hologram classifications from 5 AM to 10 PM. Specifically, all vehicles with a Hologram 2 are banned, as are Hologram 1 vehicles with plate endings of 1, 3, 4, 5, 7, and 9.
In an effort to control the environment, authorities have made it clear that certain vehicles including electric, hybrid, and emergency vehicles can continue to operate without restrictions. The new measures are critical as Mexico City battles significant air quality challenges, particularly during the warmer months when weather conditions complicate the dispersal of airborne pollutants.
Moreover, recent air quality reports indicated very poor quality levels (labeled as 'Mala') in several regions of Mexico City, including Álvaro Obregón, Benito Juárez, Cuajimalpa, Coyoacán, and Tlalpan, with health risks classified as 'Alto.' Such statistics are concerning and prompt immediate action in public health advisories encouraging everyone to take protective measures. Cancer-causing components such as benzene are released into the atmosphere from vehicle emissions and industrial activity.
In addition to restricting vehicle circulation, the CAMe continues to advise individuals on protective measures to mitigate exposure to the unhealthy air. Among these recommendations is the importance of checking the air quality through the Aire mobile application or website, which provides real-time updates on pollutants in the atmosphere. Moreover, the general public is urged to stay indoors during peak pollution hours and avoid any strenuous activity that could exacerbate health issues.
Looking ahead, the COMe continues to monitor the situation closely and is prepared to implement new measures if the deteriorating air quality persists. Authorities are expected to provide further updates on the current status of the environmental contingency in follow-up reports.
New studies indicated that the ongoing environmental impacts could result in an increased number of respiratory illnesses among sensitive groups, including children and the elderly. Therefore, it remains crucial for citizens to heed the guidelines provided by public health officials.
The UV index, a measure of sun exposure intensity, recorded a high value of 5+, suggesting an increased risk of harm from unprotected sun exposure. Citizens are advised to apply sunscreen, wear UV-filtering sunglasses, and stay hydrated—especially if they plan to be outdoors during such peak hours.
In conclusion, as the environmental conditions remain unsafe, it is imperative that citizens comply with all health advisories and maintain awareness of their personal exposure to environmental hazards. Engaging in activities that promote a healthier lifestyle, such as regularly checking air quality updates and limiting outdoor activities during high-pollution times, can significantly contribute to reducing health risks. Continued commitment to these practices will be crucial as we strive to achieve improved air quality for all in the future.
