Footage of specialised vehicles spraying water in the air in order to reduce air pollution in Chiang Mai, Thailand.

The video, filmed this week, shows the tracked vehicles, which are normally used for fighting fires, spraying large amounts of water in order to dampen dust particles which can damage people's health.

The filmer later wrote online: "Air quality is of serious concern in much of Asia."

Using remote-controlled vehicles to dampen dust levels injurious to health in Chiang Mai,Thailand. The tracked vehicles are Austrian and normally used for fire fighting. Air quality is of serious concern in much of Asia. The air quality index over the past two days has ranged between 13 and 109 in Chiang Mai.