北京的“蓝天”目标提前完成了。12月24日上午市环保监测中心发布的统计信息显示，截至目前，本市市区空气质量二级和好于二级的天数已经达到了238天，占今年总天数的65％，比去年全年多了4天。在接下来的一周时间内，北京的“蓝天”目标有望超额完成。

   

    This Chinese national capital announced on Sunday that it had 238 days of good air quality so far this year, fulfilling the annual "blue sky" target.

    The number of days with good air quality is four days more than the same period last year, according to Du Shaozhong, deputy director of the municipal bureau of environmental protection.

    "In winter, numerous construction sites in Beijing served as the main source of pollution. By late June, the days of fine air quality were 10 days fewer than that in the same period of last year, " said Du.

    "With more days of fine air quality appeared in July and August, we eventually caught up and even outstripped the pre-set plan by late August, Du said.