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Characteristics of Real-World Non-Exhaust Particulates from Vehicles
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This study characterized non-exhaust particulate emissions from vehicles including brake wear, tire wear, and road surface particles, examining their size distributions, chemical composition, and toxicity potential. The results support calls for regulatory frameworks that extend beyond tailpipe emissions to address the full spectrum of vehicle-derived pollution.
The need to regulate the non-exhaust particulate matter (PM) emissions from vehicles has been discussed worldwide due to the bad environmental impact and the toxicity to the human body. In-depth studies have been precisely conducted on the analysis of the non-exhaust particulate matters, in particular, the amount of tire, brake and road wear particles and their proportion in the atmosphere. In this study, the influence of tire and road wear particles (TRWP) on PM in the atmosphere was investigated with tire and PM samples. The PM samples suspended in the atmosphere were collected with a high-volume sampler equipped with a quartz filter. Additionally, polycyclic aromatic hydrocarbons (PAHs) and metal components in tire rubber were analyzed as markers by pyrolysis–gas chromatography/mass spectrometry (pyrolysis–GC/MS), GC/MS, and inductively coupled plasma/mass spectrometry (ICP/MS). More vinylcyclohexene was detected than dipentene in the markers measured in the samples of tires equipped with vehicles driving on the road, while more dipentene was measured in total suspended particles (TSP) samples. Among the PAHs in tire samples, pyrene exhibited the highest concentration. Benzo(b)fluoranthene showed the highest concentration in the TSP samples. Among the metals, the highest concentration was zinc in all tire samples and calcium in TSP samples.
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Characteristics of Real-world Non-exhaust Particulates from Vehicles
AI summary Read the abstract
Researchers characterized non-exhaust particulate emissions from vehicle tire and road wear, collecting atmospheric PM samples with a high-volume quartz filter sampler and using pyrolysis-GC/MS to analyze tire rubber markers including polycyclic aromatic hydrocarbons and heavy metals, quantifying the contribution of tire-brake-road wear particles to urban air pollution.
Characteristics of Real-world Non-exhaust Particulates from Vehicles
AI summary Read the abstract
Researchers analyzed non-exhaust particulate emissions from vehicles by collecting tire and atmospheric PM samples, using pyrolysis-GC/MS and ICP/MS to identify polycyclic aromatic hydrocarbons and heavy metals as markers, and found that tire and road wear particles contribute substantially to atmospheric particulate matter with toxicological implications.
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Researchers review the regulatory landscape for non-exhaust particulate emissions, noting that tire and brake wear now account for over 90% of road-transport PM10 as exhaust controls have improved, while the added mass of electric vehicles increases tire wear PM by 7–10% and brake wear PM by 12–17%—with EU limits for brakes already set and tire abrasion limits phased in from 2028.
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This automotive engineering study measured the size distribution of fine dust particles (under 10 micrometers) generated by tire wear, finding that tire-derived particles represent a significant non-exhaust source of urban particulate matter. As electric vehicle adoption reduces exhaust emissions, tire and brake wear particles will become a proportionally larger component of urban air pollution. These tire wear particles are also a major source of microplastic contamination in road runoff.
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