Mexico: High air pollution levels in capital region May 17 /update 1

Event

Due to high levels of air pollution, authorities have prolonged the “phase 1 contingency plan” initially implemented on Tuesday, May 16; the plan is currently set to remain in effect through May 17 for Mexico City and the surrounding Valle de México (valley) but could be extended further.

This pollution could cause eye, nose, and throat irritation and aggravate cardiovascular and respiratory conditions (such as asthma). The government has advised vulnerable individuals to remain indoors as much as possible - particularly between 13:00 and 19:00 (local time) when pollution levels tend to peak - and to abstain from all strenuous outdoor activities. Such individuals include children, pregnant women, and people with chronic illnesses.

Intensified driving restrictions - in addition to rotating driving restrictions permanently in place (the Hoy no circula program) are possible in the coming days should the situation worsen.

Context

The current peak in ozone contamination is a result of a high-pressure front in a combination with high vehicle use, high temperatures, higher-than-normal solar radiation, and a lack of rain. The capital region regularly suffers from high levels of air pollution, particularly in warmer periods.

Advice

Individuals present in the Mexico City region are advised to limit outdoor activities until the situation normalizes.