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| Research on the method for city air quality assessment based on fractal model |
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Abstract This paper researches on the method for city air quality assessment based on fractal model. Firstly,the fractal summation model is used to describe the character of the random distribution of the air pollutants in order to get the atmospheric background value and the standard for the study area. Then the air quality assessment method for anthropogenic resource is established with SO2, NO2 and PM10 indexes base on the ORAQI model. Finally, the method is used to assess the air quality for Xi’an City in 2010. The results shows that the air quality appears as a "U" shaped distribution with a character of seasonal variation. The air quality of Xi’an city in 2010 is good generally, with 83 percent of non-pollution days even affected by the dust storm. The air quality changes with the alternating seasons apparently, it’s better in summer and autumn than that of winter and spring.
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Received: 24 September 2011
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