MEXICO CITY – Mexican environmental authorities reactivated on Monday the Phase I pollution alert that was in effect in Mexico City virtually all of last week due to high concentrations of ozone in the atmosphere.
The alert was renewed based on air-quality readings taken Monday afternoon in the capital borough of Gustavo A. Madero, the Megalopolis Environmental Commission said in a statement.
While the megalopolis comprises Mexico City and 224 municipalities in the central states of Mexico, Hidalgo, Morelos, Puebla and Tlaxcala, the current alert applies to the sub-region of the Valley of Mexico Metropolitan Area.
Last week’s six-day alert was the area’s longest air pollution emergency since May 1998.
The Phase I alert entails restrictions on vehicle use and a requirement that factories reduce emissions of ozone precursors by up to 40 percent.
Children, the elderly, pregnant women, and people with respiratory and cardiovascular problems are urged to remain indoors between 1:00 pm and 7:00 pm.