Authorities have mobilised fleets of drones and tractors to plough rice stubble into farmland as part of a campaign to curb PM2.5 pollution, amid concerns that dust levels could rise sharply after the harvest season. The Department of Land Development has set a target of 200,000 rai across 12 provinces. In Ban Huai Nam Dip, in Chom Thong district, local rice farmers deployed dozens of tractors to