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As a resident of Asia I can tell you that people were wearing masks in late-January 2020, as soon as the outbreak was apparent in Wuhan.

This wasn't the first rodeo for SE Asia, scars of past pandemics has made the response here much more automatic, orderly and effective.

I think also supplies of masks etc were much more robust here because they were already worn in daily life due to pollution, normal sickness, etc and a massive medical tourism industry that was about to be shutdown and have their supplies made available.