Wednesday, June 19, 2024

Environmental alert reactivated in Mexico City; driving restrictions return just 20 hours after being lifted

High levels of ozone pollution prompted Mexico City authorities to reactivate a phase 1 environmental alert on Thursday, forcing a large number of cars off the road on Friday.

The Environmental Commission of the Megalopolis (CAMe) reactivated the alert at 4 p.m., just 20 hours after a previous alert was lifted.

It said in a statement that ozone levels had reached 168 parts per billion (ppb) at a monitoring station in the borough of Benito Juárez and 155 ppb at a station in Iztacalco. The city government considers concentrations of ground-level ozone over 70 ppb to be unhealthy.

CAMe said that a high-pressure system over the Valley of Mexico regained strength on Thursday, intensifying atmospheric stability with “variable wind of weak intensity.”

The climatic conditions, including “intense solar radiation,” caused an increase in ozone concentrations, which resulted in “extremely bad” air quality.

Air quality in the metropolis as of Friday morning at 10 a.m.
Air quality in the metropolis as of Friday morning at 10 a.m. Índice Aire y Salud ZMVM

Air quality had improved significantly by 8 a.m. Friday, but the environmental alert remained in place. Air quality was “good” or “acceptable” at all monitoring stations in the greater Mexico City area with the exception of that in Chalco, México state, where the classification was “bad.”

Due to the reactivation of the alert, many vehicles are prohibited from using roads in the metropolitan area between 5 a.m. and 10 p.m. Friday. Among the banned vehicles are a large number of those with license plates that end in 1, 3, 5, 7, 9 and 0. Hybrid and electric vehicles are exempt from the restrictions.

Despite the improvement in air quality on Friday morning, authorities are still advising residents of the metropolitan area to avoid outdoor activities including exercise between 1 p.m. and 7 p.m. due to health risks associated with exposure to polluted air.

Mexico News Daily

Have something to say? Paid Subscribers get all access to make & read comments.
Tropical Storm One projection Cyclone Albert

Potential tropical cyclone approaches northeastern coast of Mexico

The potential tropical cyclone could become the first named storm of the hurricane season by Wednesday.
Worried guests gather around a hot tub in Puerto Peñasco

Wife of US tourist who died in Puerto Peñasco hot tub electrocution files US $1M suit

When she saw her husband struggling under the water, Zambrano jumped in to help, only to be electrocuted herself.
A group of mostly Black migrants, some of whom maybe be undocumented foreigners, walks down a Mexican highway under a bright sun.

Nearly 1.4 million undocumented migrants detected in Mexico so far this year

The National Immigration Institute (INM) data on encounters from January to May is almost double the number for all of 2023.