La Metropolitan Area of the Valley of Mexico It faces a crucial week in terms of air quality, with a scenario that significantly increases the probability of triggering an environmental contingency due to ozoneForecasts point to several consecutive days with unfavorable conditions for the dispersion of pollutants, precisely at a time of year when the first critical episodes are usually recorded.
The environmental authorities, led by the Megalopolis Environmental Commission (CAMe)They have issued a preventative warning to the public regarding the risk of reaching a very poor air quality due to high concentrations of ozone. The warning is not limited to Mexico City, but extends to the surrounding municipalities in the State of Mexico, where significant effects on health and daily mobility are also expected.
A weather scenario that favors ozone accumulation
According to air quality forecasting models prepared by Mexico City and the Institute of Atmospheric Sciences and Climate Change of the UNAMDuring the week of February 9-15, a [unclear] will be installed over the Valley of Mexico. anticyclonic circulation in middle levels of the atmosphereThis pattern is characterized by a stable environment, with little exchange of air masses and poor ventilation.
The presence of this anticyclonic system favors clear skies and extreme solar radiation throughout much of the day. Under these conditions, solar energy acts as “fuel” for the photochemical reactions that transform primary pollutants emitted by traffic and industry into tropospheric ozone, one of the main pollution problems in the region.
Temperatures are expected to be higher than usual. This is especially concerning for this time of year, further reinforcing the risk scenario. Starting Tuesday, above-average temperatures are expected, with readings already around 27 degrees Celsius in some boroughs, such as Iztacalco, and exceeding 26 degrees Celsius in areas like Iztapalapa and Coyoacán, according to recent reports.
The other key ingredient in this scenario is the light wind forecast for the basin. Low wind speeds are predicted for Tuesday, Wednesday, and Thursday, with a slight increase toward the weekend. This lack of air movement limits the dispersion of pollutantsso they accumulate over the urban area and facilitate the reaching of high levels of ozone.
With all these factors combined, CAMe estimates that the following could be recorded ozone concentrations above 150 parts per billion (ppb), threshold from which the is activated Phase 1 of atmospheric environmental contingency due to ozoneIf this scenario is confirmed, additional restrictions on vehicle traffic would be applied and extraordinary measures to reduce emissions would be implemented.
Peak risk hours and possible contingency measures
The ozone concentration peaks In the Valley of Mexico, they usually occur between 13: 00 and 19: 00 hoursThis period is identified by authorities as posing the greatest health risk. During these hours, solar radiation is more intense and chemical reactions in the atmosphere accelerate, causing levels of this pollutant to spike.
La CAMe He stressed that if levels exceed 150 ppb, a decree could be issued second environmental emergency of the year ozone pollution in the region, following the episode recorded in early January that particularly affected the southeast of the Metropolitan Area. Furthermore, a significant number of alerts were recorded during the previous year, reflecting the recurrence of critical episodes in the zone.
In the event that Phase 1 of the contingency plan is reactivated, the following measures would be applied: additional vehicle restrictions In addition to the usual program, certain industrial and service activities with high emission potential would be temporarily suspended, and measures would be reinforced sanitary recommendations to the population to minimize exposure.
Authorities insist that the The reference week coincides with the period of the year in which historically the first serious episodes of pollution begin to appear, usually between February and May, when they converge high temperatures, low relative humidity and atmospheric stabilityThis combination makes tropospheric ozone the dominant pollutant during the evenings.
In addition, special attention has been requested during the days considered most critical, Tuesday to ThursdayDuring this period, atmospheric stability and weak winds could significantly increase the pollutant load. The slight increase in wind speed expected towards the weekend could partially alleviate the situation, although it does not guarantee a sustained improvement in air quality.
Impact of ozone on health and vulnerable groups
Elevated ozone levels represent a direct risk to healtheven in people without pre-existing conditions. Exposure to high concentrations can cause eye, nose, and throat irritationas well as causing coughing, chest tightness, and difficulty breathing.
In people with pre-existing respiratory or cardiac problems, such as asthma, COPD or cardiovascular diseasesThese episodes can trigger crises, worsen symptoms, and increase the need for medical attention. They can also reduce physical performance and cause fatigue with exertion that would not normally cause discomfort.
Official notices emphasize the protection of children, elderly people, pregnant women and people with respiratory or heart diseases, considered especially vulnerable groupsFor them, spending too much time outdoors during peak ozone concentration hours can be particularly harmful.
For this reason, it is recommended avoid strenuous physical activities Outdoors between 13:00 p.m. and 19:00 p.m., including sports, games, marches, or civic and cultural events. Strenuous physical activity increases respiratory rate and causes more pollutants to enter the lungs, amplifying the impact of poor air quality.
The authorities also advise No smoking, especially in enclosed spacesSince tobacco smoke adds to the pollutant load and worsens indoor air quality, maintaining good ventilation in homes and workplaces, especially in the early hours of the day, helps reduce the concentration of pollutants before ozone peaks occur outdoors.
Recommendations for reducing emissions and protecting yourself
In addition to self-protection measures, the authorities have issued a call to the shared responsibility among citizens to reduce emissions that give rise to ozone. The idea is that, by adding up small daily actions, the severity of pollution can be moderated during the most critical days.
Among the main recommendations, the need to reduce the use of private cars and ensure that the vehicles are in good mechanical condition. It is suggested to use the public transport, carpooling, cycling, or walking on short journeys, provided that the personal situation and distances allow it.
Companies and organizations are also encouraged to facilitate remote workas well as promoting online procedures and purchases to avoid unnecessary travel. These types of adjustments can have a significant impact on the reduction of emissions during peak hours, when vehicle traffic is heaviest.
Another key recommendation is refueling outside of peak periodsRefueling should preferably take place before 10:00 AM or after 18:00 PM. When refueling, avoid overfilling the tank and do not continue adding fuel once the fuel pump safety lock is released, as this increases the emission of vapors that contribute to ozone formation.
The population is also urged to limit the use of products containing solventsProducts such as aerosols, air fresheners, paints, waterproofing agents, and other compounds that release volatile organic compounds (VOCs) can contribute to ozone formation. Even when used indoors, these products can escape to the outside and act as ozone precursors during periods of intense solar radiation.
Responsible use of energy and gas at home
In the domestic sphere, authorities recommend checking and repair potential leaks in LP gas installationsas well as in stoves and heaters. In addition to posing a safety risk, these leaks represent unnecessary fuel emissions that can contribute to the deterioration of air quality.
It is also recommended reduce fuel consumption at homeFor example, shortening showers to a maximum of five minutes and using covered pots and pans when cooking to make better use of the heat. These measures help reduce gas and electricity consumption, which, in turn, reduces emissions associated with energy generation.
Another practical tip is to check that the The flame of stoves and heaters should be blue.A yellow or orange flame may indicate incomplete combustion, with a greater release of contaminants. In these cases, it is recommended to perform proper equipment maintenance or consult a qualified technician.
During days with higher radiation and ozone levels, it is suggested organize household activities so that tasks involving the use of chemicals, such as paints or varnishes, are postponed or carried out at less problematic times, ideally in the morning when the intensity of solar radiation is still low.
These actions, while they may seem small on an individual level, have a cumulative effect in a metropolis as vast as the Valley of Mexico, home to millions of people. Reducing emissions during critical episodes helps to mitigate the maximum level of pollution and it can make the difference between exceeding or not exceeding the contingency thresholds.
How to find out about air quality in real time
CAMe insists on the importance of citizens remaining informed at all times about air qualityTo do this, there are several official platforms that allow you to consult real-time data and forecasts for the following hours and days.
Among the main tools is the AIR and HEALTH IndexThis index integrates information from monitoring stations to provide a simple reading of the risk level. It is available on official websites and mobile applications, such as the “Air” app of Mexico City, as well as in the national system SINAICA and on the websites of CAMe itself and the Federal Ministry of the Environment.
These spaces are also used for publishing special newsletters When a significant deterioration in air quality is expected or there is a possibility of activating an environmental contingency, the warnings detail the most affected areas, the times of greatest risk, and specific recommendations for each population group.
Reports from organizations such as the Atmospheric Monitoring System (SIMAT) They also allow users to view the situation by borough or municipality, with data on particulate matter (PM10 and PM2.5), ozone, carbon monoxide, sulfur dioxide, and nitrogen dioxide. This information is useful for those who need to assess whether it is advisable to engage in outdoor activities or adjust their travel schedules.
CAMe has reiterated that a continuous monitoring of atmospheric conditions throughout the critical week and that, in case of dangerous concentrations of ozone, the corresponding protocols will be activated immediately, with new official communications through their usual channels and the media.
Everything suggests that the coming days will be crucial in determining how both the atmosphere and the public respond to the ozone contingency risk in the Valley of MexicoThe combination of institutional measures and changes in individual habits will be key to limiting the impact on health and daily life in one of the largest urban areas on the continent.
