The article uses online gas components and aerosol monitoring system (MARGA ADI 2080) to monitor the atmospheric particulates PM2 .5's water-soluble components and related inorganic gas's hourly mean mass concentration in continuous real-time ,and combing with the PM2 .5 real time data and meteorological data to analyze the dust-haze weather .The results show that the dust-haze weather on December 3rd 2013 was mainly caused by secondary pollution .%利用在线气体组分及气溶胶监测系统（MARGA ADI 2080）实时连续监测了大气颗粒物PM2．5中水溶性组分和气体中相关无机物小时平均质量浓度，并结合PM2．5的实时数据以及气象资料对监测到的灰霾天气进行了分析。结果表明：在2013年12月3日至10日上海市崇明县东平国家森林公园老烧烤场的灰霾天气监测过程中，二次污染是灰霾形成的主因。
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