Influences of traffic volumes and wind speeds on ambient ultrafine particle levels—Observations at a highway electronic toll collection (ETC) lane

Chen, Yu-Hsiang; Li, Yi-Sheng

doi:10.1016/j.atmosenv.2010.09.038

Cited by 12 publications

(2 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The UFP background levels in the typical urban environment were approximately 1.0 × 10 4 particles/cm 3 (Morawska et al, 2008;Xu et al, 2011). The UFP levels in the bus terminal were about 6-7 times higher than urban background levels, and these levels approached those near sites of heavy traffic (Beckerman et al, 2008;Buonanno et al, 2009;Hagler et al, 2009;Cheng and Li, 2011). Fig.…”

Section: Meteorological Conditionsmentioning

confidence: 82%

Temporal Variations in Airborne Particulate Matter Levels at an Indoor Bus Terminal and Exposure Implications for Terminal Workers

Chen

Chang

Yan

2012

Aerosol Air Qual. Res.

Self Cite

View full text Add to dashboard Cite

This study investigates temporal variations in PM levels in Taipei bus terminal and assesses exposure levels for bus terminal workers. Measurement results show that temporal variations in PM levels in the waiting room and on the platform of this indoor bus terminal were strongly associated with bus traffic volume. The PM 10 , PM 2.5 , and ultrafine particle (UFP) levels on the bus platform were 1.9, 2.0, and 1.2 times higher than those inside the waiting room, respectively. Additionally, PM 10 and PM 2.5 levels on the platform were approximately 2.3 and 2.8 times higher than those at an ambient monitoring station, respectively. Measurement results indicate that the major PM source inside this bus terminal is diesel buses and that PM can be trapped in this semi-confined bus terminal to a far greater extent than in typical open-air bus stations. Daily PM exposure levels for station ticket inspectors who check passenger tickets in the waiting room and manage arriving and departing buses on the bus platform are assessed. Daily PM exposure levels for station ticket inspectors during different shifts are calculated based on average PM levels and working time spent in the waiting room and on the platform. Based on observational results, station ticket inspectors spend approximately 80-85% and 15-20% of their working time in the waiting room and on the platform, respectively. Daily PM 10 and PM 2.5 exposure levels for station ticket inspectors were approximately 1.3-1.5 and 1.6-1.8 times higher than those in the outdoor atmosphere, respectively. Additionally, daily UFP exposure levels for station ticket inspectors were approximately 5.6-7.2 times higher than those in the urban background. Measurement results demonstrate that potential health risk induced by PM is high for station ticket inspectors who work for long periods at this indoor bus terminal.

show abstract

Section: Meteorological Conditionsmentioning

confidence: 82%

Temporal Variations in Airborne Particulate Matter Levels at an Indoor Bus Terminal and Exposure Implications for Terminal Workers

Chen

Chang

Yan

2012

Aerosol Air Qual. Res.

Self Cite

View full text Add to dashboard Cite

show abstract

“…One strong impact of this type of toll collection is that the emissions of vehicles will increase because of the excessive delays, long queues, and speed variation cycles for approaching vehicles [15]. As one of the most widespread technologies of intelligent transportation systems (ITSs), ETC enables drivers to pay by only slowing down instead of a complete stop [16]. ETC not only contributes to the reduced congestion in toll plazas, but also has been proven in previous studies as an promising approach that contributes to reduced fuel consumption and vehicle emissions compared to MTC, due to the mitigation of congestion and stop-and-go operations [17].…”

Section: Introductionmentioning

confidence: 99%

A Model Tree-Based Vehicle Emission Model at Freeway Toll Plazas

Wang

Zheng

et al. 2020

Sustainability

View full text Add to dashboard Cite

With the increased concern over sustainable development, many efforts have been made to alleviate air quality deterioration. Freeway toll plazas can cause serious pollution, due to the increased emissions caused by stop-and-go operations. Different toll collections and different fuel types obviously influence the vehicle emissions at freeway toll plazas. Therefore, this paper proposes a model tree-based vehicle emission model by considering these factors. On-road emissions data and vehicle operation data were obtained from two different freeway toll plazas. The statistical analysis indicates that different methods of toll collection and fuel types have significant impacts on vehicle emissions at freeway toll plazas. The performance of the proposed model was compared with a polynomial regression method. Based on the results, the mean absolute percentage error (MAPE), root mean squared error (RMSE), and mean absolute error (MAE) of the proposed model were all smaller, while the R-squared value increased from 0.714 to 0.833. Finally, the variations of vehicle emissions at different locations of freeway toll plazas were calculated and shown in heat maps. The results of this study can help better estimate the vehicle emissions and give advice to the development of electronic toll collection (ETC) lanes and relevant policies at freeway toll plazas.

show abstract

Fine and ultrafine particles in small cities. A case study in the south of Europe

Aranda

Díaz-de-Mera

Notario

et al. 2015

Environ Sci Pollut Res

View full text Add to dashboard Cite

Ultrafine particles, PM2.5 and PM10 mass concentration, NO(x), Ozone, SO2, back-trajectories of air masses and meteorological parameters were studied in a small city over the period February, 2013 to June, 2014. The profiles of PM2.5 and PM10 particles are provided, showing averaged values of 16.6 and 21.6 μg m(-3), respectively. The average number concentration of particles in the range of diameters 5.6-560 nm was 1.2 × 10(4)#/ cm(3) with contributions of 42, 51 and 7% from the nucleation, Aitken, and accumulation modes, respectively. The average number concentration of ultrafine particles was 1.1 × 10(4)#/ cm(3). The results obtained are evidence for some differences in the pollution of ambient air by particles in the studied town in comparison to bigger cities. Nucleation events due to emissions from the city were not observed, and traffic emissions amount to a small contribution to PM2.5 and PM10 particles which are mainly due to crustal origin from the arid surroundings and long-range transport from the Sahara Desert.

show abstract

Influences of traffic volumes and wind speeds on ambient ultrafine particle levels—Observations at a highway electronic toll collection (ETC) lane

Cited by 12 publications

References 28 publications

Temporal Variations in Airborne Particulate Matter Levels at an Indoor Bus Terminal and Exposure Implications for Terminal Workers

Temporal Variations in Airborne Particulate Matter Levels at an Indoor Bus Terminal and Exposure Implications for Terminal Workers

A Model Tree-Based Vehicle Emission Model at Freeway Toll Plazas

Fine and ultrafine particles in small cities. A case study in the south of Europe

Contact Info

Product

Resources

About