I read a long thread in a fb expat group the other day. Someone was asking about cough remedies. A few others chimed in and complained they had coughs lately. Nobody connected it to the rising level of pollution these last few weeks.
I suspect it's largely the same demographic that says sit pollution doesn't bother them. Lung cancer, heart disease, stroke and dementia are increased by air pollution, and you don't always have advance warning.
I do what I can to warn people. I too have an air filter, live in one of the better areas in Thailand for air quality, and sometimes wear an n95 if it's bad out. And I do my best to make others aware of the danger. It's possible things will change if there's public awareness and the will to change things.