Particles exhausted from cars have adverse impacts on

\r\nhuman health. The study developed a three-dimensional particle

\r\ndispersion numerical model including particle coagulation to simulate

\r\nthe particle concentration distribution under idling conditions in a

\r\nresidential underground garage. The simulation results demonstrate

\r\nthat particle disperses much faster in the vertical direction than that in

\r\nhorizontal direction. The enhancement of particle dispersion in the

\r\nvertical direction due to the increase of cars with engine running is

\r\nmuch stronger than that in the car exhaust direction. Particle dispersion

\r\nfrom each pair of adjacent cars has little influence on each other in the

\r\nstudy. Average particle concentration after 120 seconds exhaust is

\r\n1.8-4.5 times higher than the initial total particles at ambient

\r\nenvironment. Particle pollution in the residential underground garage

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