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Emission Characteristics of VOCs from On-road Vehicles in an Urban Tunnel in Eastern China and Predictions for 2017–2026

Category: Urban Air Quality

Accepted Manuscripts
DOI: 10.4209/aaqr.2018.07.0248
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Chengxun Deng1, Yujuan Jin1, Min Zhang2, Xiaowei Liu3, Zhimin Yu 1

  • 1 Department of Biological and Environmental Engineering, Hefei University, Hefei 230022, China
  • 2 Anhui Environmental Monitoring Center Station, Hefei 230071, China
  • 3 School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, China

Highlights

A tunnel experiment was used to analyze spatiotemporal variations in VOC emissions.
Branched alkanes were the most abundant VOCs.
Emission factors were calculated for different VOC species and vehicle types.
VOC emissions from vehicle exhaust were predicted for 2017–2026.


Abstract

Automobile exhaust emissions represent the main source of atmospheric volatile organic compound (VOC) pollution in urban areas of China. To accurately obtain recent emission characteristics of vehicles under urban road conditions, an optimized tunnel experiment was conducted in Longchuan Tunnel, Hefei, eastern China. Based on preliminary experiments examining the spatial and temporal characteristics of VOCs within the tunnel, a sampling scheme was designed to quantitatively analyze 51 VOCs. Among the 36 detected VOCs, about 52% were alkanes (mainly branched alkanes), with a total average emission factor of 41.39 ± 12.81 mg km−1 veh−1. The compounds with the second highest proportion were benzene homologues, while alkenes accounted for the smallest proportion. Dimethylbutane exhibited the highest average emission factor (13.3 ± 3.19 mg km−1 veh−1), followed by toluene (7.06 ± 3.14 mg km−1 veh−1) and then 2-methylpentane (6.44 ± 2.10 mg km−1 veh−1). The emission factors of VOCs in Longchuan Tunnel were consistent with those of other studies in recent years, but were considerably lower than those of tunnels measured in 2004. Based on the average emission factors of VOCs for light-duty and heavy-duty vehicles (81 ± 27 and 99 ± 42 mg km−1 veh−1, respectively), the predicted vehicle population and vehicle-kilometers-traveled data, the emissions of VOCs were predicted for 2017–2026. The results showed that if no control measures are taken, the total VOC emission volume and emission intensity will increase from 2510 ± 850 tons yr−1 to 3270 ± 1120 tons yr−1 and from 1859 ± 630 kg km−2 to 2422 ± 830 kg km−2, respectively, between 2017 and 2026.

Keywords

Volatile organic compounds Tunnel study Emission factor Emission intensity Grey model


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Accepted Manuscripts
DOI: 10.4209/aaqr.2018.06.0225
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