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Real-world emission factors of PM 2.5 (particle's aerodynamic diameter of less than 2.5μm), NO x (the sum of NO 2 and NO), and CO from mixed vehicles in the Shing Mun Tunnel in Hong Kong have been determined. A total of 16 runs were made during varying times that encompassed different traffic fractions of diesel-fueled vehicles. During the study, a total of 27,310 vehicles...
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