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Mexico City Lifts Four Day Air Pollution Alert

Mexican officials have lifted a four day air pollution alert in the nation's densely populated capital after ozone levels dropped to acceptable levels. Mexico City authorities issued the first air poluuution alert in 14 years due to high ozone levels, restricting traffic, encouraging children to stay indoors and ordering factories to cut emissions. The city government declared an "environmental contingency" following a surge in ozone concentration, which can cause respiratory and heart ailments. Officials temporarily banned some 1.1 million vehicles from the metropolis.