Thai Foreign Minister Marit Saengyoumpong said the three countries would coordinate efforts to address pollution from industrial, transportation, agricultural, and forest fire sources, with PM2.5 levels expected to surge as temperatures drop.
Bangkok will ban trucks with six or more wheels from entering designated zones when PM2.5 levels exceed safety thresholds starting next year, with violators facing fines up to 2,000 baht ($56) or one month in prison. Low-emission certified vehicles will be exempt.
The three nations plan to meet again in Bangkok by year-end to discuss detailed measures, following Thailand's March warning to halt corn imports from neighboring countries that fail to control crop burning, which authorities say significantly contributes to the region's severe air quality issues during the December-March dry season.