“Fahsai Mini” and Its Mission to Purify Bangkok’s Air
Created By RISC | 1 day ago
Last modified date : 1 day ago
Ratchaprasong District, one of Bangkok’s busiest business hubs, experiences constant movement from both locals and tourists throughout the day. This high traffic density contributes to the accumulation of air pollution, particularly fine particulate matter (PM), which poses significant health risks to urban residents.
To address this, the “Fahsai Mini” air purification tower was installed to explore the potential of outdoor air purification systems under real operating conditions. The project gained the trust of Gaysorn and Ratchaprasong district management, leading to the installation of units in front of Gaysorn Amarin and Gaysorn Village buildings.
Fahsai Mini utilizes Venturi Scrubber technology, continuously refined by the Research & Innovation for Sustainability Center (RISC), to effectively capture dust particles and other air pollutants. A real-time air quality monitoring system automatically adjusts the tower’s operation based on detected dust levels, allowing the system to respond precisely to current conditions and use resources only as needed.
Performance evaluations conducted in March–April 2025, a period marked by persistently high PM2.5 levels, showed that Fahsai Mini could significantly reduce PM2.5 concentrations, achieving a maximum average hourly reduction efficiency of 65% and a maximum 24-hour daily average reduction of 36%. These results corresponded closely with environmental factors such as wind direction and speed, relative humidity, and daily traffic density.
Time-based analysis indicated that Fahsai Mini performed best from evening (18:00) to midday (12:00), coinciding with peak area usage and traffic congestion. During midday periods with strong natural winds, PM2.5 levels were also reduced, further improving air quality.
Even during the rainy season or periods of lower dust levels, Fahsai Mini operates automatically based on real-time conditions, activating only when dust levels exceed the set threshold. This ensures consistently low dust concentrations and helps minimize short-term exposure to high particulate levels.
Fahsai Mini is no longer just an air purification device — it serves as a continuous monitoring mechanism, working tirelessly to protect everyone from invisible airborne threats, even when people are unaware of the risks around them.
Content by Napol Kieatkongmanee, Senior Sustainable Designer