Roadside Air Quality Simulation Model for Urban Main Roads in Japan Clean Air Program (I) Development of the Simulation Model

• Published in: Journal of Japan Society for Atmospheric Environment / Taiki Kankyo Gakkaishi Vol. 38; no. 5; pp. 269 - 286
• Main Authors: YOSHIKAWA, Yasuo, HAYASHI, Seiji, HIRAI, Hiroshi, UEHARA, Kiyoshi
• Format: Journal Article
• Language: English; Japanese
• Published: Japan Society for Atmospheric Environment 10.09.2003
• Subjects: air quality monitoring station; emission estimation; field experiment; roadside air quality; simulation model; validation; wind tunnel experiment
• ISSN: 1341-4178; 2185-4335
• DOI: 10.11298/taiki1995.38.5_269

As a research work in Japan Clean Air Program (JCAP), a micro-scale air quality simulation model, aiming to analyze the effect of automotive emission on roadside air quality, was developed. The model consists of (1) simulation of micro-scale traffic on target roads, (2) estimation of emission gas distribution along the roads, and (3) simulation of air flow and advection/diffusion of emission gas around the roads. Validity of the simulation model was verified by comparison with (1) flow around simple shapes in a wind tunnel experiment, (2) flow in a miniature urban model in the wind tunnel, (3) tracer gas concentration in a diffusion field experiment in a real urban area, and (4) measurement values at continuous air monitoring stations. In every comparison, the model showed good agreement. In the prediction of daily average concentration at the monitoring stations, calculation yields were 20-30% different from the measurements, which showed applicability of the model to prediction of real urban roadside air quality.