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Reducing PM10 and PM2.5 Concentrations in a Subway Station by Changing the Diffuser Arrangement
Seong-Gyu Kim1, Gibong Sung1, Se-Jin Yook1
1School of Mechanical Engineering, Hanyang University, Seoul 04763, Korea.
Toxics
|September 22, 2022
Summary
To meet Seoul
Area of Science:
- Environmental Science
- Urban Air Quality
- Public Health Engineering
Background:
- Seoul mandates strict particulate matter (PM) limits in subway stations by 2024.
- Existing ventilation systems may not consistently meet these reinforced air quality standards.
- Subway stations face unique challenges with indoor and outdoor pollutant sources.
Purpose of the Study:
- To analyze particulate matter (PM10 and PM2.5) concentrations in a Seoul subway station.
- To evaluate the impact of air-conditioning diffuser arrangement on indoor air quality.
- To identify strategies for meeting stringent PM concentration regulations.
Main Methods:
- Dynamic analysis of PM concentrations under worst-case scenarios.
- Simulation of pollutant introduction from outdoor air and train cabins.
- Comparative analysis of different air-conditioning diffuser arrangements.
Main Results:
- Average PM concentrations met criteria, but local exceedances occurred under existing conditions.
- Relocating diffusers to waiting room walls reduced PM10 by ~10.5% and PM2.5 by ~5%.
- Modified diffuser arrangement satisfied criteria in most areas, except near platform screen doors (PSDs).
Conclusions:
- Optimizing diffuser placement is crucial for improving subway air quality.
- Strategic ventilation adjustments can help meet regulatory PM limits.
- Findings offer a basis for enhancing air quality in urban transit systems.
