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Item Metadata only Numerical analysis of volatile organic compounds concentration and evaluation of hazard index in Bangkok, Thailand(Mahidol University. Mahidol University Library and Knowledge Center, 2023) Wisit Thongkum; Natchanok Pala-En; Sarawut Thepanondh; Sopa Chinwetkitvanich; Wanida Jinsartconcentration of all air toxic compounds except 1,3-butadiene. Three different spatial interpolation techniques namely, ordinary kriging, the inverse distance weighted (IDW), and spline were tested in order to find the most appropriate scheme to provide the best... interpolated results for this study. A cross validation and several statistical parameters were employed for selection. Results indicated that in general, IDW performs much better than the other techniques. The impact zone was defined as an area having annual