Impact of change in traffic flow on vehicle non-exhaust PM2.5 and PM10 emissions: A case study of the M25 motorway, UK

Lin, Siyi; Liu, Ye; Chen, Haibo; Wu, San; Michalaki, Vivi; Proctor, Phillip; Rowley, Gavin

doi:10.1016/j.chemosphere.2022.135069

Cited by 10 publications

(3 citation statements)

References 40 publications

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“…For four consecutive days on the controlled testbed and low-traffic, university roads, the sL levels measured at the same time were found to continue to increase in deposition in the absence of specific events for rainfall, and the weather conditions observed were at a 11 µg/m 3 C res concentration (Table 3). As an influencing factor of resuspended dust generated on paved roads, it is known that the concentration level deposited on the section varies greatly depending on the heavy vehicle configuration and characteristics of traffic [32]. It has been shown that the resuspended dust from the road due to vehicle travel can be deposited, removed, moved into the air [23], or affected by weather conditions, geometric conditions, building geometry, etc.…”

Section: Sl and Resuspended Dust On Paved Roads With Different Inflow...mentioning

confidence: 99%

Characteristics of Resuspended Road Dust with Traffic and Atmospheric Environment in South Korea

et al. 2022

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Characterizing the influencing factors of resuspended dust on paved roads according to the atmospheric environment and traffic conditions is important to provide a basis for road atmospheric pollution control measures suitable for various road environments in the future. This study attempts to identify factors in the concentration of resuspended dust according to the level of road dust loading and PM10 emission characteristics according to atmospheric weather environment and traffic conditions using real-time vehicle-based resuspended PM10 concentration measuring equipment. This study mainly focuses on the following main topics: (1) the increased level of resuspended dust according to vehicle speed and silt loading (sL) level; (2) difference between atmospheric pollution at adjacent monitoring station concentration and background concentration levels on roads due to atmospheric weather changes; (3) the correlation between traffic and weather factors with resuspended dust levels; (4) the evaluation of resuspended dust levels by road section. Based on the results, the necessity of research to more appropriately set the focus of analysis in order to characterize the resuspended dust according to changes in the traffic and weather environment in urban areas is presented.

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Section: Sl and Resuspended Dust On Paved Roads With Different Inflow...mentioning

confidence: 99%

Characteristics of Resuspended Road Dust with Traffic and Atmospheric Environment in South Korea

et al. 2022

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“…Particle emission is also influenced by the vehicle category [28]. Based on research [29], it was concluded that resuspended road dust (43%), non-exhaust emissions (37%), diesel exhaust emissions (13%), and gasoline exhaust emissions (7%) participate in the total emission of particles.…”

Section: Introductionmentioning

confidence: 99%

“…Based on research [29], it was concluded that resuspended road dust (43%), non-exhaust emissions (37%), diesel exhaust emissions (13%), and gasoline exhaust emissions (7%) participate in the total emission of particles. In a study [28] conducted on the M25 motorway in Great Britain during the lockdown due to the outbreak of the COVID-19 pandemic, it was found that there was a much lower flow of vehicles of different categories, and there was a reduction in non-exhaust emissions of PM 2.5 and PM 10 particles for all vehicle categories. It was also concluded that heavy-duty vehicles emit particles much more than other vehicles and that the most dominant source of particles on the highway is resuspension from the road, followed by road wear, tire wear, and brake wear.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Parameters Influencing the Formation of Particles during the Braking Process: Experimental Approach

Vasiljević,

Glišović,

Lukić

et al. 2023

Atmosphere

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Knowing and understanding the parameters influencing the concentration of particles created by brake wear, as one of the main contributors to non-exhaust emissions from vehicles, is important for the further development of systems on vehicles to reduce the concentration of particles, and also for further research in the field of developing new friction pairs. In this research, a brake inertial dynamometer was used to measure brake particles, and four different brake pads were examined. Based on a previous review of the applied tests and driving cycles, the braking parameters were determined, i.e., the initial simulated speed of the vehicle, the load of one-quarter of the vehicle, and the brake pressure. The ambient temperature, air humidity, coefficient of friction between friction pairs, deceleration, and braking time can have an influence depending on the brake pad. Further, during the measurement, the temperatures of the brake pads were also measured, where the initial temperature of the brake pads was always the same. In order to process the data, several methods were used, including the presentation of the obtained results in a time domain, the application of the Taguchi design of the experiment with the analysis of the parameters, and a correlation analysis using the Pearson and Spearman correlation coefficients. In this research, the authors concluded that the influences of the parameters primarily depend on the applied brake pads. The vehicle speed turned out to have a large influence in all cases, as did the load, i.e., the influence of the vehicle weight (indirectly through the kinetic energy of the vehicle). In this case, the pressure showed less influence on the particle concentration. An important braking parameter that has a significant impact on the concentrations of PM2.5 and PM10 particles is the final temperature of the brake pads.

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To what extent the traffic restriction policies can improve its air quality? An inspiration from COVID-19

Yang

et al. 2022

Stoch Environ Res Risk Assess

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In hazy days, several local authorities always implemented the strict traffic-restriction measures to improve the air quality. However, owing to lack of data, the quantitative relationships between them are still not clear. Coincidentally, traffic restriction measures during the COVID-19 pandemic provided an experimental setup for revealing such relationships. Hence, the changes in air quality in response to traffic restrictions during COVID-19 in Spain and United States was explored in this study. In contrast to pre-lockdown, the private traffic volume as well as public traffic during the lockdown period decreased within a range of 60−90%. The NO 2 concentration decreased by approximately 50%, while O 3 concentration increased by approximately 40%. Additionally, changes in air quality in response to traffic reduction were explored to reveal the contribution of transportation to air pollution. As the traffic volume decreased linearly, NO 2 concentration decreased exponentially, whereas O 3 concentration increased exponentially. Air pollutants did not change evidently until the traffic volume was reduced by less than 40%. The recovery process of the traffic volume and air pollutants during the post-lockdown period was also explored. The traffic volume was confirmed to return to background levels within four months, but air pollutants were found to recover randomly. This study highlights the exponential impact of traffic volume on air quality changes, which is of great significance to air pollution control in terms of traffic restriction policy. Supplementary Information The online version contains supplementary material available at 10.1007/s00477-022-02351-7.

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Impact of change in traffic flow on vehicle non-exhaust PM2.5 and PM10 emissions: A case study of the M25 motorway, UK

Cited by 10 publications

References 40 publications

Characteristics of Resuspended Road Dust with Traffic and Atmospheric Environment in South Korea

Characteristics of Resuspended Road Dust with Traffic and Atmospheric Environment in South Korea

Analysis of Parameters Influencing the Formation of Particles during the Braking Process: Experimental Approach

To what extent the traffic restriction policies can improve its air quality? An inspiration from COVID-19

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