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《Ecology and Environmental Sciences》 2013-04
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Research progress on negative air ions in urban environment in China

WANG Wei1,2,YU Zhuang2 1.School of Architecture and Urban Planning,Anhui University of Architecture,Hefei 2300,China 2.School of Architecture and Urban Planning,Huazhong University of Science and Technology,Wuhan,Hubei 430074,China  
Negative air ion is regarded as "Air Vitamin and Auxin",and its concentration has been proved to be an important assessment index in air quality,and takes an significant role in improving urban air.The paper reviewed the study of negative air ion in urban environment in major developments,and elaborated the negative air ion generation mechanism,observation methods,spatiotemporal characteristic,assessment index system,key impact factors and their relationships thoroughly and systematically.Next,the author focuses on the negative air ion relationship with the natural environment and the built environment.The main results of domestic and foreign research show that:(1) Negative air ion concentration varies widely in different environments,and increasing from the country center to the suburban to the village.(2) Annual and diurnal of negative air ion concentration changes are significantly different.(3)Water is greater impact on negative air ion concentration,negative air ion concentration of dynamic water is higher than static water,especially for the waterfall reach the max value.At the same time,the nearer to the water,the higher the negative air ion concentration will be gotten.(4)Negative air ion is most close to the wind,and negative air ion concentration the wind is higher than without wind,and wind speed with negative air ion concentration have a positive correlation.Other factors such as temperature and humidity,weather conditions,plant green,building materials and building height can also affect the level of the negative air ion concentration,thus affecting the air cleanliness degree of the urban environment.Researchers found that negative air ion can reduce the concentration of airborne particles,and has relationship with PM2.5.These studies provide a scientific basis for the comprehensive guidance and evaluation of the built environment air quality and design ideas.With the process of urbanization in China,the author advises the further more ideas:(1) At the level of regulatory detailed planning,the author suggest studying the negative air ion concentration with urban design and urban green space system,and carrying out periodic negative air ion concentration empirical research.(2)Try to establish assessment method of the negative air ion concentration with the urban residential ventilation,in order to do basic research on air cleanliness degree and ventilation of urban residential.
【Fund】: 安徽省教育厅自然科学重点项目(KJ2013A069);; 安徽省教育基本建设学会科研课题(1211-3);; 安徽建筑大学校级教学团队项目(2011TX01)
【CateGory Index】: X831
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