Hanoi, April 4 -- Hanoi (NNT/VNA) - The Thai Department of Royal Rainmaking and Agricultural Aviation has deployed its fleet to address hazardous PM2.5 dust in Northern Thailand, focusing on Chiang Mai province, where air quality reaches hazardous levels.

Director-General Rachen Sillaparaya led a strategic planning session to address the "purple level" air quality index, which signals severe health risks. The department has set up a specialised weather modification unit in Chiang Mai and deployed five aircraft: two L410S, two CASAs, and one CN, to implement relief measures.

The department's strategy includes dry-ice seeding and cold-water spraying to remove particulate matter and support cloud formation. Operations will follow a phased ...