Institute of Environmental Engineering, National Sun Yat-Sen University, Kaohsiung 804, Taiwan; Center for Emerging Contaminants Research, National Sun Yat-Sen University, Kaohsiung 804, Taiwan.
Institute of Environmental Engineering, National Sun Yat-Sen University, Kaohsiung 804, Taiwan.
Sci Total Environ. 2019 Apr 10;660:188-198. doi: 10.1016/j.scitotenv.2019.01.007. Epub 2019 Jan 5.
Road traffic is one of the main sources of particulate matter in the atmospheric environment. Notwithstanding its significance, there are noteworthy challenges in quantitative assessment of its contribution to the concentrations of airborne. This study reports on the characterization and quantification of PM emissions and PAHs concentration in PM from the exhausts of on-road diesel vehicles with various accumulated mileages in Kaohsiung City, Taiwan. Urban areas could be a subject matter not just in connection to deprived air quality, but similarly to pollution of other significant environmental media by air contaminants. To that end, our study intends to estimate the PM emissions from diesel vehicles using diesel fuels and to analyze the PM emissions and PAHs concentration in PM. In this study, particulate matters (PM) were characterized and quantified from a place impacted by diesel vehicles fueled with diesel in Kaohsiung City, Taiwan. The tested diesel vehicles with various accumulated mileages overs the model year comprising of the vehicles registered from 1984 to 2012 from different manufacturers (or brands) ranging from 8733 to 965,026 km (average 445,433 km) accumulative mileages. Exhaust constituents include CO, NOx, PM and particle phase PAHs. The concentrations of twenty-one (21) priority polycyclic aromatic hydrocarbons (PAHs) were studied in the samples by their relationship with atmospheric PM. However, in relations to cumulative mileages, lower cumulative mileage (mileage <20,000 km) has the lowest CO and NOx emission factors. The mileage ranged from 20,001 to 30,000 km had an increased CO and NOx emission factors, respectively. Interestingly, with the increased high number of mileages ranged from 30,001 to 50,000 km, CO and NOx emission factor was observed to be declining, respectively. This could be attributed to the technological changes on new diesel vehicle models. But nonetheless, the trend of CO emission factor was found to be higher with an increasing of cumulative mileages as compared to the mileage that reached lower than 30,000 km.
道路交通是大气环境中颗粒物的主要来源之一。尽管其意义重大，但定量评估其对空气中浓度的贡献仍存在显著挑战。本研究报告了台湾高雄市不同累积里程的道路柴油车辆尾气中 PM 排放和 PAHs 浓度的特征和量化。城市地区不仅是空气质量恶化的主题，而且同样是空气污染物对其他重要环境介质污染的主题。为此，我们的研究旨在使用柴油燃料估计柴油车辆的 PM 排放，并分析 PM 排放和 PAHs 浓度。在这项研究中，从台湾高雄市受柴油车辆影响的地方对颗粒物 (PM) 进行了特征描述和量化。测试的柴油车辆具有不同的累积里程，涵盖了 1984 年至 2012 年不同制造商（或品牌）注册的车辆，里程从 8733 到 965,026km（平均 445,433km）不等。废气成分包括 CO、NOx、PM 和颗粒相 PAHs。通过它们与大气 PM 的关系研究了样本中 21 种（21）优先多环芳烃 (PAHs) 的浓度。然而，就累积里程而言，较低的累积里程（里程<20,000km）具有最低的 CO 和 NOx 排放因子。里程在 20,001 到 30,000km 之间的 CO 和 NOx 排放因子分别增加。有趣的是，随着里程数从 30,001 到 50,000km 的增加，CO 和 NOx 排放因子分别观察到下降。这可能归因于新型柴油车辆模型的技术变化。但是，与达到低于 30,000km 的里程相比，随着累积里程的增加，CO 排放因子的趋势发现更高。
