GEOGRAPHICAL RESEARCH ›› 2008, Vol. 27 ›› Issue (2): 241-250.doi: 10.11821/yj2008020001

• Environment and Ecology •     Next Articles

A quantitative analysis on spatial distribution of the pollutants in the urban air and their impact factors based on geostatistics and GIS: A case study of Hangzhou city

WANG Wei-wu1, CHEN Chao2   

  1. 1. Institute of Urban Planning Engineering and Information Technology, Zhejiang University, Hangzhou 310058, China;
    2. Hangzhou Environment Monitoring Center Station, Hangzhou 310018,China
  • Received:2007-09-11 Revised:2007-12-02 Online:2008-03-25 Published:2008-03-25
  • Supported by:

    国家自然科学基金资助项目(40201021);浙江省自然科学基金资助项目(M403040);国家高技术研究发展计划(863 计划) 探索导向类资助项目(2007AA12Z239763)

Abstract:

Urban air pollution is produced in the process of all kinds of human activities such as industrial production, living and traffic. Rapid urbanization processes result in the increasing of the kinds and concentration of the pollutants in the air of built-up area. By taking streets and towns as the basic spatial analysis unit, the concentrations of sulfur dioxide, ozone nitrogen dioxide and some factors influencing urban air pollutions in Hangzhou such as population density, percentage of road area,built-up area,surface temperature and NDVI are mapped and computed based on ordinary kriging, GIS and RS in this paper. The relativity between the concentration of three pollutants and their influencing factors are quantitatively evaluated by integrating spatial correlation analysis, and the characteristics are obtained by overlay of the ranked data layers. The results show that in downtown (including Shangcheng, Xiacheng, Gongshu), Xihu and Jianggan, the spatial relativity between three air pollutiants and their impact factors have spatial heterogeneity. Among the three pollutions, the spatial distributiants of NO2 is firstly influenced by the distribution of impact factors; SO2 is secondly, and O3 is thirdly. The overall degree of air pollution outdoor in Hangzhou is the highest in downtown and the lowest in Xihu. The strong spatial heterogeneity is the main characteristic of the distribution of the air pollutants in the built-up area.The two main aims of the quantitative analysis on spatial distribution of urban air pollutions and their influence from other factors are to provide the scientific basis for establishing pertinently the reasonable countermeasures to mitigate urban air pollution and putting forward the effective measures for the prevention and control of air pollution.

Key words: ordinary kriging, spatial relativity, urban air pollution, impact factor, Hangzhou