In news reports less than 10 years ago, the new problem of PM2.5 dust was added to news items in the Thai media of forest fires and the problem of haze caused by forest fires and crop burning. This has led to a clear concrete policy shift, since it has a direct impact on the lives of the middle class in the country’s large cities, especially major centres like Bangkok and tourist spots like Chiang Mai Province. With an unidentifiable origin, smog, forest fires and PM2.5 have by implication become the same thing.