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目的对2014—2015年浙江省11个城市的空气质量进行分析,为改善空气质量提供依据。方法从环境保护部数据中心收集2014—2015年浙江省杭州、宁波、温州、嘉兴、湖州、绍兴、金华、衢州、舟山、台州和丽水11个市的每日空气质量监测数据,对比分析2014和2015年的空气质量指数(AQI)、污染与非污染日数及首要污染物日数等。结果与2014年相比,2015年11个城市总体AQI由75降为73(P<0.01)。2014年金华市AQI最高,为90;2015年湖州市AQI最高,为88;这两年舟山市AQI均为最低。各市AQI随月份波动幅度较大,以1月和12月AQI较高。总体非污染日数由76.12%上升到78.53%(P<0.05),其中绍兴市增加10.01%;空气质量等级均以良为主(59.12%~59.96%)。这两年首要污染物均以PM_(2.5)和O_3-8 h为主,与2014年比,2015年以PM_(2.5)为首要污染物的日数减少7.45%;衢州市减少比例最高,为25.07%。结论与2014年相比,2015年浙江省11个城市空气质量总体好转,首要污染物均以PM_(2.5)和O_3-8 h为主,舟山市空气质量优于其他10个城市。
Objective To analyze the air quality of 11 cities in Zhejiang Province from 2014 to 2015, and provide the basis for improving air quality. Methods Daily air quality monitoring data from 11 cities of Hangzhou, Ningbo, Wenzhou, Jiaxing, Huzhou, Shaoxing, Jinhua, Quzhou, Zhoushan, Taizhou and Lishui in Zhejiang Province from 2014 to 2015 were collected from MEP Datacenter. 2015 air quality index (AQI), pollution and non-pollution days and the number of primary pollutants. Results Compared with 2014, the overall AQI in 11 cities dropped from 75 to 73 (P <0.01) in 2015. Jinhua City in 2014 the highest AQI, 90; the highest AQI in Huzhou City in 2015, 88; AQI Zhoushan City in the past two years are the lowest. The AQI of cities varies greatly from month to month, with AQI higher in January and December. The total number of non-pollution days increased from 76.12% to 78.53% (P <0.05), of which, Shaoxing City increased by 10.01%. The air quality levels were mainly good (59.12% -59.96%). The main pollutants in these two years are mainly PM 2.5 and O 3-8 h. Compared with 2014, the number of days with PM 2.5 as the major pollutant decreased by 7.45% in 2015, while the reduction in Quzhou City was the highest at 25.07 %. Conclusion Compared with 2014, the overall air quality of 11 cities in Zhejiang Province improved in 2015 with the main pollutants being PM 2.5 and O 3-8 h, and Zhoushan’s air quality is superior to the other 10 cities.