2007年上海地区空气质量综述

Review on the Air Qualities in 2007,Shanghai

本文根据上海地区2007年可吸入颗粒物(PM_(10))、二氧化硫(SO_2)和二氧化氮(NO_2)等3种污染物的空气污染指数资料,统计分析了这一年上海地区空气质量状况,并与前6年(2001—2006年)的平均状况进行对比,结果表明:2007年上海地区空气质量达到优良等级的有328天,全年出现轻度污染以上37天,其中中度污染(201<API<300)1天和重污染(API≥300)2天;在37天污染日中,PM_(10)为首要污染物的有36天,另外一天首要污染物是NO_2。2007年与2006年相比,空气质量总体略有好转,主要表现为空气污染日有所减少,但与前2年相比,出现了中度污染日和重污染日,其他数据与2006年基本持平。此外本文还从地面天气形势类型和风向、风速等方面进行了空气污染日的气象条件分析。

By analyzing the data of air quality in Shanghai during 2001—2007,the following findings were showed that:(1) The best air quality occurred in summer and the worst occurred in winter and spring in Shanghai.In the recent 2 years,the days of which the API was below 101 were more than 300 days,the air quality in shanghai was getting a bit better.(2) The API of SO_2 had a trend of increase.(3) Air pollution was closely related to the synoptic systems,including low pressure trough.(4) Weather elements,especially wind speed and direction,had decisive effects on the diffusion of air pollutants,air pollution days easily occurred in static wind days and in the days of dominant wind direction in west or northwest.