Chiang mai: Intensive rainmaking operations have been launched in northern Thailand as authorities aim to alleviate severe air pollution affecting the region, particularly in Chiang Mai. The Department of Royal Rainmaking and Agricultural Aviation has mobilized six aircraft to tackle the persistent PM2.5 dust problem, which has reached hazardous levels.
According to Thai News Agency, Mr. Rachen Silapraya, Director-General of the Department of Royal Rainmaking and Agricultural Aviation, disclosed the plan following a strategic meeting to address the weather modification operations. The initiative comes as air quality in Chiang Mai was reported to have a PM2.5 level of 211 micrograms per cubic meter, classified as purple, indicating a severe health hazard.
In response to the alarming air quality, five aircraft from the weather modification unit in Chiang Mai and one from Phitsanulok have been deployed. The morning's mission involved aerial spraying of cold water and dry ice across critical areas in Chiang Mai province, including Mueang, Hod, Doi Tao, Omkoi, Mae Rim, Samoeng, and Doi Saket districts, to rapidly reduce particulate matter in the atmosphere.
The operation involves a series of strategic maneuvers:
- A large CN aircraft sprayed cold water at an altitude of 3,000 feet over Doi Saket and Mae On districts.
- Two CASA aircraft dispersed dry ice at 6,600 feet in Hang Dong and Hod districts.
- Two L410 aircraft operated at altitudes of 6,200-6,600 feet in Hod and Hang Dong districts.
- A BT-67 aircraft from the Royal Thai Air Force dispersed dry ice at 5,500 feet in Li District, Lamphun Province.
The department has also adjusted plans to include two additional CASA aircraft in preparation for cloud seeding operations. With forecasts indicating suitable relative humidity on April 5-6, artificial rainmaking is expected to increase rainfall chances, thereby mitigating the dust situation more effectively.
Director-General Rachen emphasized the importance of continuous and intensive planning to gradually improve air quality, with the ultimate goal of restoring visibility of the spire of Wat Phra That Doi Suthep. The department remains committed to closely monitoring weather conditions and adjusting flight plans as necessary, ensuring that every resource is utilized to resolve the air pollution problem swiftly.