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《Journal of Arid Meteorology》 2017-04
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Relationship Between Air Pollution Index and Visibility,Relative Humidity in Ten Representative Cities of China

SHANG Ziwei;NING Guicai;WANG Jiexin;CHENG Yifan;WANG Shigong;College of Atmospheric Sciences,Lanzhou University;School of Atmospheric Sciences,Chengdu Information and Engineering University;  
Not only atmospheric pollutants but also fog is an important factor affecting the visibility. Therefore,the air quality reflected by visibility needs to consider the effect of water vapor. In this paper,the mathematical models of air pollution index(API) associated with visibility and relative humidity were constructed based on the existing research results. Based on daily air pollution index and simultaneous surface meteorological data at 08: 00 BST from 10 representative cities in China from 2001 to 2012,the coefficients in the formula were determined using linear regression analysis method firstly,and the statistical equation for estimating API by visibility and relative humidity was established. Results are as follows:(1) When relative humidity was less than 78%,visibility was mainly affected by the concentration of air pollutants,but when relative humidity was greater than 96%,visibility was mainly affected by relative humidity,while when relative humidity ranged from 78% to 96%,visibility was affected by the common effect of air pollutants and humidity.(2) Except for Lhasa and Lanzhou,the correlation coefficients between API and visibility,relative humidity in the rest of eight cities passed the significance test level of α = 0. 000 01,and the correlation degree in winter half year was better than that in summer half year.(3) The variation range of parameters b0 and b in the fitting relationship between air pollution index and visibility,relative humidity was small in the rest cities except for Lhasa,Urumchi and Lanzhou.(4) Back test showed that except some individual months,the absolute error and relative error were relatively small,so the API associated with visibility and relative humidity in the formula could be fitted.
【Fund】: 国家自然科学基金项目(91644226;41575138);; 国家基础科技条件平台建设项目(NCMI-SBS17-201607;2016NCMIZX09;NCMI-SJS15-201607);; 中央高校基本科研业务费专项资金项目(lzujbky-2017-it20)共同资助
【CateGory Index】: P427.2;X16;X51
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