Mexico City air quality and environmental contingency status for November 4, 2026, Digi Mart USA News (Mexico City, Mexico): The Secretariat of the Environment (Sedema) of Mexico City reports poor air quality with a high health risk on November 4. For this reason, authorities will maintain normal activities without activating an environmental contingency phase in the capital or in the State of Mexico.
Despite this report, pollution in the Mexico Valley Metropolitan Area often changes during the day. When pollutant levels rise, authorities apply restriction measures to protect the population.
What to do when air quality is poor
According to the Megalopolis Environmental Commission, when a contingency or poor air quality occurs in Mexico City and its metropolitan area, the following is recommended: avoid civic, cultural and recreational activities, as well as outdoor exercise, between 1:00 p.m. and 7:00 p.m.
Suspend any outdoor activity organized by public or private institutions during the same hours. Postpone outdoor, sports, cultural or mass entertainment events scheduled between 1:00 p.m.
and 7:00 p.m. Do not smoke, especially in enclosed spaces.
How pollution affects health
Data from the National Institute of Public Health indicate that environmental pollution increases cases of respiratory and cardiovascular diseases. Children, older adults and people with chronic conditions represent the group at greatest risk.
Vehicle traffic is the main source of pollutant emissions in the urban area, which is why authorities apply fixed programs to regulate vehicle circulation.
Which vehicles are restricted on Wednesday, November 4
The Hoy No Circula program maintains its regular schedule for this Wednesday in Mexico City and the State of Mexico. Vehicles that must suspend circulation are those with holograms 1 and 2 and red sticker, with plate endings 3 and 4.
When an environmental contingency is activated
The official air quality standard for ozone states that 90 parts per billion should not be exceeded for one hour. However, the Megalopolis Environmental Commission sets the start of a contingency when measurements reach 155 points.
At that level, official agencies apply additional traffic restrictions and suspend work in industrial sectors to reduce emissions.
