现在距离奥运会开幕还有不到50天，中国有关部门上周五公布了车辆限行措施，北京机动车将在奥运期间按单双号行驶，限行期限为两个月。
With fewer than 50 days to the Olympic Games, Chinese authorities on Friday announced plans to almost halve the number of cars on the capital's roads for a two-month period.
概要：《北京市空气重污染应急预案》今天正式发布，市环保局新闻发言人方力表示，空气污染达一级红色预警时，机动车将实行单双号限行。
When a red-alert for air pollution goes into effect, the emergency plan will only allow drivers to use their vehicles every other day on an odd-even license plate system.
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