By large cities I'm talking about all major hubs. Sisaket, Surin, Roi Et, Bueng Kan, Chiang Mai and Rai, Samut Prakan, Nonthaburi, Hat Yai, Korat, Khon Kaen, Udon, Ubon, Chon Buri etc. Kanchanaburi is pretty small, and isolated, but a nice place for history. People love city life, so they have to deal with the pollution of all kinds, especially the air up north.
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