This air quality measurement tool known as "Dust Boy" was developed by Chiang Mai University researchers and has been used by villagers in the northern region since 2018. Data is collected by 800 small air-monitoring machines developed by Chiang Mai researchers and shows air quality in real-time. Data from Air4Thai, the official PCD air monitoring station went in the same direction. The PCD's air monitoring quality is known for its conservative estimations as it calculates average air quality over 24 hours. However, air quality in the capital has improved massively during the past week with PM2.5 levels having dropped to an average of between 20-40 µg/m³.

Source: Bangkok Post January 27, 2020 23:37 UTC