The morning commute on Day 1 of Mexico City's smog-alert car ban

Under regulations imposed after the capital city experienced its worst air-quality crisis in more than a decade, 40 percent of cars were ordered off the road on Tuesday.

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    Cars drive along what would usually be a very busy thoroughfare in Mexico City, Wednesday, April 6, 2016. City authorities have barred millions of vehicles from the streets due to a pollution alert. (AP Photo/Dario Lopez-Mills)
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    A man rides his bicycle along Reforma Avenue in Mexico City, Wednesday, April 6, 2016. City authorities have barred millions of vehicles from the streets due to a pollution alert. (AP Photo/Dario Lopez-Mills)
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    Passengers enter the Tasquena metro station in Mexico City, Wednesday, March 16, 2016. Authorities have banned more than 1 million cars from the roads and offered free subway and bus rides to coax people from their vehicles as Mexico City's first air pollution alert in 11 years stretched into a third day. (AP Photo/Eduardo Verdugo)
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    A woman uses a surgical mask to protect herself from the smog in Mexico City. (Photo: AP/Rebecca Blackwell)
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    Passengers enter the Tasquena metro station in Mexico City, Wednesday, March 16, 2016. Authorities have banned more than 1 million cars from the roads and offered free subway and bus rides to coax people from their vehicles as Mexico City's first air pollution alert in 11 years stretched into a third day. (AP Photo/Eduardo Verdugo)
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    A man walks over what would usually be a very busy thoroughfare in Mexico City, Wednesday, April 6, 2016. City authorities have barred millions of vehicles from the streets due to a pollution alert. (AP Photo/Dario Lopez-Mills)
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    Air pollution hangs over Mexico City, Wednesday, March 16, 2016. Authorities have banned more than 1 million cars from the roads and offered free subway and bus rides to coax people from their vehicles as Mexico City's first air pollution alert in 11 years stretched into a third day. (AP Photo/Eduardo Verdugo)
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