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双循环
本报告以PM2。5、SO2、O3、CO和NOx五项污染物作为分析要素，根据2014～2018年的地面监测数据，分析表征了全国范围各区域内北京、天津、石家庄、郑州、上海、广州、重庆、西安、乌鲁木齐等9个典型的经济快速发展城市的大气污染时空变化，阐明我国重要城市群落的大气污染现状和存在的问题，有针对性地为大气污染监测与治理以及相关部门制定相应政策提供科学依据。
<<Based on the ground monitoring data of PM2.5，SO2，O3，CO and NOx during 2014-2018，the spatial-temporal variations of major air pollutants in nine typical cities with rapid economic development and serious air pollution（Beijing，Tianjin，Shijiazhuang，Zhengzhou，Shanghai，Guangzhou，Chongqing，Xi’an and Urumqi）were investigated. This work aims to identify the air pollutant characteristics and differences in various cities，assess the status of air pollution and get a thorough understanding of atmospheric environment quality in key regions，and finally propose constructive advice on air pollution control in China.
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