Abstract. Based on high frequency data of AQI and contaminants, this paper makes researches including general situation of air pollution, fluctuation rules of air quality in one day and associated rules of air pollution between cities by using statistical analysis methods like the hour index of AQI and building the VAR model. The conclusions are as following: firstly, it is obvious that air pollution which often manifests as pollution of particulates has a seasonal effect and a clustering property. Secondly, different seasons have different air quality fluctuation rules in one day. However, with no consideration of the phase position diversity of graphs, intraday fluctuation rules of air quality in one season are similar to those in other seasons. Thirdly, the deterioration of air condition of one city can cause the deterioration of air condition of other cities, and the peak of this influence appears in one day generally, and the influence weakens with the increase of spatial distance.
Abstract. This paper constructed AQI hourly & monthly index to make a comparison based on the high-frequency AQI data and major pollutants statistical data of four ethnic minority urban agglomerations, then established a VAR model to analyze the Variance Decomposition. The results indicated that the air pollution of four urban agglomerations had exhibited noticeable seasonal effect and clustering feature. Once there was a deterioration of air quality in one city, the other neighboring cities would spread it rapidly but decayed slowly. According to the results of the Variance Decomposition, whose orders was determined by the average velocity to the peak of the impulse response function, a scheme was proposed in this paper to solve the issues in the allocation of responsibilities for regional joint prevention in each city.
Based on the high-frequency AQI data, this paper analyzed the air pollution laws of Lan-Xi-Yin urban agglomeration from the perspective of air quality grade distribution, the primary pollutant and pollutants' daily variation.Then it used the APRIORI algorithm to excavate the rules of pollutants. The results show that the overall air quality of the Lan-Xi-Yin urban agglomeration is better than that of national average,and PM10 and O 3 are the primary pollutants. The air quality in summer and autumn is obviously better than that in winter and spring. In addition to O 3 , the fluctuations of PM10, PM2.5, SO 2 , NO 2 and CO are both bimodal within a day, 9:00 -12:00 and 21:00 -23:00 are the concentration's high period; APRIORI algorithm finds 18 high confidence PM2.5 rules in total. According to the results of excavation, we should pay attention to the concentration of CO. The air pollution control of the urban agglomeration can start from the source of CO due to the homology characteristics of pollutants.
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