On Monday, March 31, 2025, the "Hoy No Circula" program is in full effect in Mexico City (CDMX) and the State of Mexico (Edomex), a crucial measure aimed at controlling vehicle emissions and improving air quality in the densely populated region. This initiative restricts the circulation of specific vehicles to combat pollution, which has been a growing concern due to high ozone levels.
Vehicles affected by this program today include those with yellow stickers, license plates ending in 5 and 6, and those with verification holograms 1 and 2. In contrast, vehicles with holograms 0 and 00, electric and hybrid vehicles, motorcycles, and cars displaying disability plates are allowed to circulate without restrictions.
The "Hoy No Circula" program operates from 5:00 AM to 10:00 PM, and non-compliance could lead to fines ranging from 2,075 to 3,112 pesos. Importantly, Sundays are exempt from these restrictions, allowing all vehicles to operate freely.
As the day unfolds, the weather in CDMX and Edomex is expected to be predominantly sunny, with temperatures rising to around 30°C in the central, northern, and eastern municipalities. However, the sunny conditions also contribute to an increase in ozone levels, which can cause irritation in the eyes, nose, and throat.
The air quality today is forecasted to be moderate in the morning but will deteriorate to poor levels by the afternoon. The concentration of ozone is predicted to exceed 130 µgm³, which is concerning for sensitive individuals and the general population alike. The situation is exacerbated by the high pressures at 5 kilometers altitude, which limit cloud formation and allow for increased solar radiation, further elevating temperatures and ozone levels.
Looking ahead, the air quality is projected to remain a concern throughout the week. Between Tuesday, April 1, and Friday, April 4, ozone concentrations are expected to exceed 140 µgm³, indicating that residents should remain vigilant about their exposure to air pollution.
On Tuesday, the weather will continue to be sunny, with wind gusts reaching up to 35 kilometers per hour. Morning temperatures will start at 13°C, with highs again around 30°C. However, the air quality is expected to be poor in the afternoon, with ozone levels fluctuating between 100 and 120 µgm³, potentially peaking at over 160 µgm³ around 3 PM.
Wednesday, April 2, will see similar conditions, with wind gusts increasing to over 40 kilometers per hour. The air quality will remain poor, and residents can expect maximum ozone concentrations greater than 145 µgm³ in the afternoon.
Thursday, April 3, is forecasted to bring slightly more cloud cover in the afternoon, but temperatures will still reach a maximum of 31°C. Air quality will be rated from moderate to poor, continuing the trend of elevated ozone levels.
As the weekend approaches, temperatures will remain high, ranging from 30 to 32°C. However, on Sunday, April 6, there is an anticipated increase in cloudiness and the potential for rain and storms, which may provide some relief from the persistent pollution levels.
In summary, the "Hoy No Circula" program remains a vital tool in managing air quality in the megalopolis, especially as the region faces challenges related to weather conditions and pollution. Citizens are encouraged to stay informed about the restrictions and air quality reports to safeguard their health and well-being.
