启动霾橙色预警的地区范围更大。上月底发布的红色预警曾导致车辆限行和学校关闭。
An even larger region is under orange alert for smog, after red alerts late last month forced traffic off the roads and closed some schools.
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.
北京在一些日子里实行车辆牌照单双号限行。
Beijing is to ban vehicles with even and odd-numbered license plates on alternate days.
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