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A Comparative Study of Air Quality Index Based on Factor Analysis and US-EPA Methods for an Urban Environment

机译：基于因子分析和US-EPA方法的城市环境空气质量指数比较研究

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There are many different air quality indexes, which represent the global urban air pollution situation. Although the index proposed by USEPA gives an overall assessment of air quality, it does not include the combined effects (or synergistic effects) of the major air pollutants (Shenfeld, 1970; Ott and Thom, 1976; Thom and Ott, 1976; Murena, 2004). So an attempt is made to calculate the Air Quality Index based on Factor Analysis (NAQI) which incorporates the deficiencies of USEPA method. The daily, monthly and seasonal air quality indexes were calculated by using both these methods. It is observed that a significant difference exists between NAQI and EPAQI. However, NAQI followed the trends of EPAQI when plotted against time. Further, the indexes were used to rank various seasons in terms of air pollution. The higher index value indicates more pollution in relative terms. Moreover, the index may be used for comparing the daily and seasonal pollution levels in different sites.
机译：空气质量指数有很多，它们代表了全球城市空气污染状况。尽管美国环保局（USEPA）提出的指数可以对空气质量进行整体评估，但它不包括主要空气污染物的综合效应（或协同效应）（Shenfeld，1970; Ott和Thom，1976; Thom和Ott，1976; Murena， 2004）。因此，尝试基于因子分析（NAQI）来计算空气质量指数，该因子分析结合了USEPA方法的不足。通过使用这两种方法计算每日，每月和季节性空气质量指数。可以看出，NAQI和EPAQI之间存在显着差异。但是，NAQI随时间变化时遵循EPAQI趋势。此外，该指数还用于根据空气污染对各个季节进行排名。较高的指数值表示相对而言污染程度更高。此外，该指数可用于比较不同地点的每日和季节性污染水平。

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