Data handling
; Interpolation
; Land use
; Nitrogen oxides
; Pollution
; Regression analysis
; Spatial distribution
; Statistics
; Uncertainty analysis
; Air pollutant concentrations
; Concentration maps
; Kriging
; Land use regression
; Monitoring network
; Prediction accuracy
; Regression modelling
; Variograms
; Air pollution
; nitric oxide
; accuracy assessment
; air quality
; atmospheric pollution
; concentration (composition)
; data set
; kriging
; land use
; nitrogen oxides
; outlier
; particulate matter
; pollution monitoring
; regression analysis
; spatial variation
; uncertainty analysis
; variogram
; accuracy
; air pollutant
; Article
; case study
; Japan
; kriging
; land use regression
; neighborhood
; particulate matter
; prediction
; predictor variable
; priority journal
; regression analysis
; regression kriging
Scopus学科分类:
Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要:
Land use regression (LUR) or regression kriging have been widely used to estimate spatial distribution of air pollutants especially in health studies. The quality of observations is crucial to these methods because they are completely dependent on observations. When monitoring data contain biases or uncertainties, estimated map will not be reliable. In this study, we apply the spatial outlier detection method, which is widely used in soil science, to observations of PM2.5and NO2obtained from the regulatory monitoring network in Japan. The spatial distributions of annual means are modelled both by LUR and regression kriging using the data sets with and without the detected outliers respectively and the obtained results are compared to examine the effect of spatial outliers. Spatial outliers remarkably deteriorate the prediction accuracy except for that of LUR model for NO2. This discrepancy of the effect might be due to the difference in the characteristics of PM2.5and NO2. The difference in the number of observations makes a limited contribution to it. Although further investigation at different spatial scales is required, our study demonstrated that the spatial outlier detection method is an effective procedure for air pollutant data and should be applied to it when observation based prediction methods are used to generate concentration maps. � 2017 Elsevier Ltd
Graduate School of Engineering, Osaka University, Yamadaoka 2-1, Suita, Osaka, Japan; Graduate School of Energy Science, Kyoto University, Yoshidahonmachi, Sakyo, Kyoto, Japan; Otsu City Public Health Center, Goryocho-3-1, Otsu, Shiga, Japan
Recommended Citation:
Araki S,, Shimadera H,, Yamamoto K,et al. Effect of spatial outliers on the regression modelling of air pollutant concentrations: A case study in Japan[J]. Atmospheric Environment,2017-01-01,153