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Atmosphere 2017, 8(6), 99; doi:10.3390/atmos8060099

Back-Calculation of Traffic-Related PM10 Emission Factors Based on Roadside Concentration Measurements

Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China
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Author to whom correspondence should be addressed.
Academic Editor: Robert W. Talbot
Received: 31 March 2017 / Revised: 10 May 2017 / Accepted: 24 May 2017 / Published: 2 June 2017
(This article belongs to the Section Air Quality)
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Abstract

Many researchers have failed to utilize back-calculation to estimate traffic emissions effectively or have obtained unclear results. In this study, the back-calculation of traffic-related PM10 emission factors based on roadside concentration measurements was analyzed. Experimental conditions were considered to ensure the success of back-calculation. Roadside measurements were taken in a street canyon in Shanghai, China. Concentrations from a background site were often found to exceed the measured concentrations at the roadside on polluted days as more errors occurred in the background concentrations. On clean days, these impacts were negligible. Thus, only samples collected on clean days were used in back-calculation. The mean value from back-calculation was 0.138 g/km, which was much smaller than the results obtained using official emission models. Emission factors for light-duty vehicles (LDV), medium-duty vehicles (MDV), heavy-duty vehicles (HDV), and motorcycles were approximately 0.121, 0.427, 0.445, and 0.096 g/km, respectively. The fleet-averaged non-exhaust emission factor was approximately 0.121 g/km, indicating that road dust accounted for 87.7% of the roadside concentration increments. According to the dispersion simulation of reserved samples, the concentrations simulated using back-calculated emission factors were in better agreement with the measured data than the concentrations derived using modeled emission factors. View Full-Text
Keywords: PM10 emission factors; back-calculation; experimental conditions; emission models PM10 emission factors; back-calculation; experimental conditions; emission models
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Wang, Y.; Huang, Z.; Liu, Y.; Yu, Q.; Ma, W. Back-Calculation of Traffic-Related PM10 Emission Factors Based on Roadside Concentration Measurements. Atmosphere 2017, 8, 99.

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