Mexico City smog alert forces 40 pct of cars off the road
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Mexico City is heading into a second day of a pollution alert and has raised the number of cars that must stay off the streets because smog is at 1½ times acceptable limits.
Under rules that took effect Tuesday, authorities ordered 40 percent of cars to stay home Wednesday. The ban covers over 2 million cars in the metropolitan area, which has about 20 million residents.
The city is offering some free bus services and taxi discounts.
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New rules that will be in effect through June generally idle one-fifth of the city's cars per day, but the percentage doubles when pollution is 1½ times limits.
Previously, newer or cleaner cars had been exempt from the driving ban. License plate numbers determine when cars can't be used.