沙尘天气 sandy and dusty weather
The Beijing Meteorological Service issued a warning on Wednesday morning on sandy and dusty weather in the city.
北京市气象局3月28日早晨发布沙尘天气预警。
Sand blew in from Mongolia on Monday, affecting an area of 1.5 million square kilometers as of Wednesday noon, including the Inner Mongolia autonomous region; Shanxi, Hebei and Jilin provinces; and Beijing and Tianjin municipalities, the China Meteorological Administration said.
据中央气象台介绍,此次沙尘源自蒙古国,覆盖范围涉及内蒙古、山西、河北、吉林,以及北京、天津等地,影响面积约150万平方公里。
The sand worsened air quality so much in many places that it exceed the ability of equipment to measure it, the administration said.
中央气象台介绍,此次沙尘天气强度大,造成多地空气质量爆表。
监测显示,北京地区28日5时至7时,PM10小时浓度瞬间由282微克/立方米飙升到接近2000微克/立方米,定陵达3157微克/立方米,同时,北京大部PM2.5峰值浓度为180~335微克/立方米,出现混合型严重污染。
PM2.5与PM10有何区别
PM2.5是指大气中直径小于或等于2.5微米的颗粒物(particulate matter smaller than 2.5 micrometers in diameter),可直接进入人体的肺泡(alveoli of the lungs),也称为可入肺颗粒物。它的直径还不到人的头发丝粗细的1/20。虽然PM2.5只是地球大气成分中含量很少的组分,但它对空气质量和能见度(air quality and visibility)等有重要的影响。与较粗的大气颗粒物相比,PM2.5粒径小,富含大量的有毒、有害物质(toxic and hazardous matters)且在大气中的停留时间长、输送距离远,因而对人体健康和大气环境质量的影响更大。
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