On Friday, April 18, 2025, air quality in the Ciudad de México (CDMX) and the State of Mexico (Edomex) raised concerns as the Comisión Ambiental de la Megalópolis (CAMe) reported bad air quality across much of the region. While the situation did not warrant the activation of Phase I of the environmental contingency, the air quality was deemed poor in most areas.
The CAMe confirmed that the air quality was classified as bad in the Zona Metropolitana del Valle de México (ZMVM), with the exception of Tláhuac, Chalco, and Tlalnepantla, where conditions were reported as acceptable with moderate health risks. The #ÍndiceAIREYSALUD indicated that in Tláhuac, Chalco, and Tlalnepantla, the air quality was acceptable, but the rest of the ZMVM faced high health risks.
As of 8:42 AM on Friday, the Sistema de Monitoreo Atmosférico (Aire-CDMX) reported elevated pollution levels in various alcaldías including Benito Juárez, Gustavo A. Madero, Venustiano Carranza, and Coyoacán, as well as in the municipalities of Nezahualcóyotl and Tultitlán. By 1:00 PM, the air quality remained poor throughout the ZMVM, with a significant risk to public health.
According to the report from the Dirección de Monitoreo Atmosférico, the air quality was classified as “Muy Mala” (very bad) at 3:00 PM, with a “Muy Alto” (very high) health risk for those engaging in outdoor activities. The report also noted that the ultraviolet (UV) rays index reached level 5, indicating a need for protection against sun exposure.
Despite the alarming air quality, the CAMe did not activate an environmental contingency for the day. This decision reflects ongoing challenges in managing air quality in the region, which has been a persistent concern for both residents and authorities. The CAMe's recommendations included avoiding outdoor physical activities, especially during peak hours of pollution, and ensuring proper hydration.
For those planning to travel or engage in outdoor activities, the Hoy No Circula program was in effect on this day, applying to vehicles with blue stickers and plate endings of 9 and 0, as well as those with holograms 1 and 2. Exemptions included vehicles with holograms 00 and 0, along with electric and hybrid vehicles. The restrictions were enforced from 5:00 AM to 10:00 PM local time.
In light of the air quality issues, the CAMe urged residents to take precautions. This included avoiding outdoor activities, particularly between 1:00 PM and 7:00 PM, when pollution levels typically peak. Additionally, individuals with respiratory or cardiovascular conditions were advised to stay indoors and seek medical attention if they experienced symptoms such as difficulty breathing, sore throat, or eye irritation.
As the city grapples with these environmental challenges, the Secretaría del Medio Ambiente (Sedema) continues to monitor air quality closely. The agency attributes fluctuations in air quality to various factors, including seasonal changes, traffic emissions, and industrial activities. The ongoing efforts to improve air quality involve implementing stricter environmental policies, promoting public transport, and encouraging sustainable practices among residents.
In a broader context, the air quality situation in Mexico City is reflective of global challenges faced by urban areas, where pollution levels can severely impact public health. The authorities emphasize the importance of community awareness and participation in environmental conservation efforts, including reducing reliance on fossil fuels and increasing the use of public transport.
As the day progressed, the CAMe reiterated its commitment to keeping the public informed about air quality conditions and potential health risks. Citizens are encouraged to stay updated through official channels and to utilize resources like the Sistema Nacional de Información de la Calidad del Aire (SINAICA) for real-time air quality monitoring.
The situation serves as a reminder of the ongoing battle against air pollution in urban centers, where the need for collective action and individual responsibility is paramount. With the health of millions at stake, the authorities continue to advocate for sustainable practices and policies to ensure a healthier environment for all residents.
As the weekend approaches, residents are advised to remain vigilant and informed about air quality updates, particularly as they plan outdoor activities during the holiday season.
