City encountered this year the first obvious dust day today. At 10 am on northern suburbs began to significantly influenced by external dust, a sharp rise in PM10 concentration, concentration of single station hours are more than 500 micrograms per cubic meter, and affect the city soon. At 11, according to city 6 area concentration of PM10 hours is 756 micrograms per cubic meter; Northwest of 994 micrograms per cubic meter; Northeast 946 micrograms per cubic meters; Southeast 602 microgram/cubic meters; Southwest 750 microgram/cubic meter.

　　Beijing meteorological observatory dust released on March 28, 10 20 points when blue warning signal, its expected, 28 days, Beijing has the dust weather, please pay attention to guard against. On March 20th night Beijing had slight dust weather, the dust weather today is the first time this year in Beijing dust weather process significantly. Beijing dust weather caused by exogenous input and the local dust, it was reported that a lot of dust storm yesterday of Mongolia.

　　At present, the dust from north to south of Beijing's sphere of influence gradually increased, PM10 pollution levels rise further, please reduce outdoor activities, and shut the doors and Windows.

　　京城今日遭遇今年首个明显沙尘天。上午10时起，北部郊区开始明显受到外来沙尘的影响，PM10浓度大幅上升，单站小时浓度均超过500微克每立方米以上，并很快影响到城区。11时数据显示，城六区PM10小时浓度为756微克/立方米;西北部为994微克/立方米;东北部946微克/立方米;东南部602微克/立方米;西南部750微克/立方米。

　　北京市气象台3月28日10时20分发布沙尘蓝色预警信号，其预计，28日白天，北京有沙尘天气，请注意防范。3月20日夜间北京曾出现轻微浮尘天气，今天的沙尘天气是北京今年第一次明显沙尘天气过程。北京沙尘天气因外源输入和本地扬尘造成，据介绍，昨日蒙古国出现大范围沙尘暴。

　　目前，沙尘自北向南对北京的影响范围逐渐加大，PM10污染水平进一步升高，请大家减少户外活动，关好门窗。