Real world particle size distribution from vehicle fleet and implication on emission control DOI Creative Commons
Fuyang Zhang, Jianfei Peng, Jinsheng Zhang

et al.

Published: April 28, 2025

Abstract Particle size distribution (PSD) of vehicular emissions is crucial for assessing their impacts on air quality and human health. However, real-world PSD data from vehicle fleets scarce. Here, we conducted a two-week tunnel measurement fleet emission. The estimated fleet-average emission factor particle number (PN) was 2.6 × 10 14 kg-fuel −1 . peaked in nucleation mode, indicating significant role volatile particles likely formed outside exhaust pipes. Diurnal variations PN correlated with traffic flow; however, high-emitting diesel vehicles, particularly those other cities, caused notable spikes black carbon during off-peak hours. Positive matrix factorization analysis confirms this critical vehicles also reveals the dominance non-exhaust PM 2.5 This study highlights importance stricter regulations measures to mitigate mode particles.

Language: Английский

Emission dynamics of reactive oxygen species and oxidative potential in particles from a petrol car and wood stove DOI Creative Commons
Battist Utinger, Alexandre Barth, Andreas Paul

et al.

Aerosol Research, Journal Year: 2025, Volume and Issue: 3(1), P. 205 - 218

Published: April 22, 2025

Abstract. Air pollution is one of the largest environmental health risks and leading causes adverse outcomes mortality worldwide. The possible importance oxidative potential (OP) as a metric to quantify particle toxicity in air increasingly being recognised. In this work, OP reactive oxygen species (ROS) activity particles from fresh aged petrol passenger car emissions residential wood combustion (RWC) were investigated using two novel instruments. Applying online instruments an ascorbic acid (AA) 2′,7′-dichlorodihydrofluorescein (DCFH) assay provides much higher temporal resolution compared with traditional filter-based methods allows for new insights into highly dynamic changes ROS these sources. Due efficiency particulate filter Euro 6d car, almost no primary emitted and, thus, or was detected exhaust. However, substantial ROSs observed after photochemical ageing due formation secondary particles. Increasing also when comparing RWC emissions. Overall, had signals This suggests that could be major contributor may intrinsically more harmful emission source than exhaust, although still high. These measurements illustrate strong differences nature toxicity-relevant properties sources contribute efficient mitigation policies.

Language: Английский

Citations

0
Real world particle size distribution from vehicle fleet and implication on emission control DOI Creative Commons
Fuyang Zhang, Jianfei Peng, Jinsheng Zhang

et al.

Published: April 28, 2025

Abstract Particle size distribution (PSD) of vehicular emissions is crucial for assessing their impacts on air quality and human health. However, real-world PSD data from vehicle fleets scarce. Here, we conducted a two-week tunnel measurement fleet emission. The estimated fleet-average emission factor particle number (PN) was 2.6 × 10 14 kg-fuel −1 . peaked in nucleation mode, indicating significant role volatile particles likely formed outside exhaust pipes. Diurnal variations PN correlated with traffic flow; however, high-emitting diesel vehicles, particularly those other cities, caused notable spikes black carbon during off-peak hours. Positive matrix factorization analysis confirms this critical vehicles also reveals the dominance non-exhaust PM 2.5 This study highlights importance stricter regulations measures to mitigate mode particles.

Language: Английский

Citations

0