I have lived in the north for quite a while (dividing time between the north and a little outside of Bangkok)...masks were simply not seen much BEFORE Covid, that is a fact. It was Covid that changed everything...hence why mask wearing was very common in Chiang Mai during the "great haze of 2023" when much of Thailand was blanketed in thick haze until well into May, including and especially Chiang Mai, Mae Sai and other parts of the north. However, wind back to 2018 or 2019 and it was totally different...very few masks seen. That being said, 2023 was probably the worst year in history in terms of smoke haze, although Pai and some other areas have just experienced record breaking PM2.5 figures now.
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