Fortunately this AQI condition is measured in weeks, not months. Every year the purifier comes out for a few weeks and is then put away. It is horrible, no argument there. But if you are not a tourist and you don't work outdoors, the situation will pass in a short bit of time and you are not likely to be harmed by this air if you stay indoors most of the time and use a basic purifier -- 15-30 minutes of this high AQI will not cause any harm. I'm certainly not trying to justify or make excuses, but forest fires are not easy to control -- whether in Thailand, Canada or the US. Intentional burning MUST STOP, but no government has shown the will to enforce the laws that are passed. And it is not only Thailand, in Chiang Mai the condition is worsened by Myanmar, Laos, China and mountain hill-tribe burning -- and even the local Thai farmers will burn if they think they can get away with it. I've seen this "smog" in Los Angeles, Denver, Mexico City and elsewhere. It can be fixed, but it will take time, and the will-power and conviction of weak politicians who would rather pay cash for votes than actually make social improvements.