该应急方案规定，严重污染日时，建筑施工工地应减少产生大量灰尘的施工行为，并要求工业企业减少排放。

The plan also requires municipal traffic authorities to limit government vehicle usage during smoggy days, with the goal of reducing such usage by 30 percent compared to normal days.

方案还要求市政交通部门在浓雾天气采用临时交通管制，限制政府车辆的使用，目标是减少正常日中30%的车辆。

The plan also calls for education authorities to instruct schools to limit or completely stop outdoor activity during periods of heavy air pollution.

方案另外要求教育部门指示学校等在严重空气污染期间减少或完全终止户外活动。

The municipal environmental monitoring center said readings for PM2.5, or airborne particles measuring less than 2.5 micrometers in diameter, had reached more than 700 micrograms per square meter at several monitoring stations in Beijing, reaching as high as 993 Saturday evening.

北京市环境检测中心表示，在北京市的几个监测站，PM2.5的浓度检测结果（即大气中直径小于或等于2.5微米的颗粒物）达到了每立方米700微克以上，周六晚间更是高达993微克。

"These figures represent extremely bad pollution. Pollutants have gradually accumulated over the course of recent windless days, making the air quality even worse," said Zhu Tong, a professor from the college of environmental sciences and engineering at Peking University.

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