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| DOI | 10.1016/j.atmosenv.2021.118878 |
| Kerbside NOx and CO concentrations and emission factors of vehicles on a busy road | |
| Chu M.; Brimblecombe P.; Wei P.; Liu C.-H.; Du X.; Sun Y.; Yam Y.S.; Ning Z. | |
| 发表日期 | 2022 |
| ISSN | 1352-2310 |
| 卷号 | 271 |
| 英文摘要 | Vehicular emissions contribute to roadside pollutants in cities, yet on-road emission estimates remain relatively uncommon. Nevertheless, they make an important contribution to exposure along Hong Kong's congested roads and street canyons. This study used kerbside microsensor-based monitors on Hennessy Road, one of the busiest roads in the north part of Hong Kong Island, to determine both concentrations and emission factors (EFs) of NOx and CO. Kerbside NOx and CO concentrations are skewed, with high concentrations representing plume segments from larger vehicles. The average EFs for each minute of traffic was determined from the pollutant concentration ratio with ΔCO2. These related to bus frequency for NOx, and EURO 4 or lower-emission standard vehicles for CO. The 1-min mean EFNOx 7.55 g kg−1 and EFCO 12.6 g kg−1 are typical for flows for the fleet dominated by buses, but highly skewed (Weibull shape parameter ∼0.44). Individual vehicle EFs were determined from peaks in NOx, CO and CO2, and number plates. Leading and trailing parts of the plume segments gave similar EFs (R2 > 0.95), suggesting this method was reasonably robust across the vehicle passage. Nevertheless, these EFs were also skewed, but the shape parameter was again ∼0.44. EFNOX for vehicle classes was: buses > goods vehicles > private cars > vans > taxis and diesel > petrol > LPG, with larger engine sizes also dominant. Differences were more difficult to assess with CO, but LPG vehicles had the highest EFs. Our EF estimates lay in the range found in previous studies but differ from fleet emissions calculated for regulatory purposes in Hong Kong (EMFAC). However, some high EMFAC emitters were also high in our estimates for individual vehicles. Vehicles may not perform on-road as inventory calculations suggest. The high EF variability found in our study implies that a large sample is required to assess the likely emissions from a vehicle fleet. © 2021 Elsevier Ltd |
| 关键词 | Diesel busesEURO emission StandardsExhaust plumesHong KongTraffic related air pollutants |
| 语种 | 英语 |
| scopus关键词 | Automobiles; Diesel engines; Fleet operations; Nitrogen oxides; Pollution; Roads and streets; Trucks; Air pollutants; CO concentrations; Diesel bus; Emission factors; Emission standard; EURO emission standard; Exhaust plumes; Hong-kong; Traffic related air pollutant; Traffic-related; Buses; carbon dioxide; nitric oxide; carbon monoxide; concentration (composition); emission; nitrogen oxides; road; traffic emission; air pollutant; Article; calculation; concentration ratio; controlled study; exhaust gas; Hong Kong; plume; taxis response; China; Hong Kong; Hong Kong Island |
| 来源期刊 | ATMOSPHERIC ENVIRONMENT
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| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/248095 |
| 作者单位 | Division of Environment and Sustainability, The Hong Kong University of Science and Technology, Hong Kong; Department of Marine Environment and Engineering, National Sun Yat-sen University, Kaohsiung, Taiwan; Department of Mechanical Engineering, The University of Hong Kong, Hong Kong |
| 推荐引用方式 GB/T 7714 | Chu M.,Brimblecombe P.,Wei P.,et al. Kerbside NOx and CO concentrations and emission factors of vehicles on a busy road[J],2022,271. |
| APA | Chu M..,Brimblecombe P..,Wei P..,Liu C.-H..,Du X..,...&Ning Z..(2022).Kerbside NOx and CO concentrations and emission factors of vehicles on a busy road.ATMOSPHERIC ENVIRONMENT,271. |
| MLA | Chu M.,et al."Kerbside NOx and CO concentrations and emission factors of vehicles on a busy road".ATMOSPHERIC ENVIRONMENT 271(2022). |
| 条目包含的文件 | 条目无相关文件。 | |||||
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