glad that smog problem eg pm2.50 in bangkok also received due attention.
perhaps some creative or unconventional thinking is urgently needed to solve this persisting aggravating problem?! assuming that the culprit is external, for example, from cambodia, it is right step for thailand to liaise with cambodia govt to jointly solve the problem but also good to request thai friendly china govt to help, exerting some pressure on cambodia to do better? secondly,assume we can't do much to reduce external pollution source, couldn't we do more INSIDE thailand to push for more EV to replace gasoline vehicles by subsidy or increase import tax for the traditional vehicles, or bring forward European new standard sooner, or use multipronged approach? improved air quality could attract more wealthy guys and elderly retirees ?