Deployment of a mobile platform to characterize spatial and temporal variation of on-road fine particles in an urban area

Lin, Tzu-Chi; Chiueh, Pei-Te; Griffith, Stephen M.; Liao, Chien-Chieh; Hsiao, Ta-Chih

doi:10.1016/j.envres.2021.112349

Cited by 8 publications

(2 citation statements)

References 68 publications

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“…Similar studies suggested that the increased concentrations during morning peak was due to the combination effects of peak vehicle flux and intensified solar irradiation rate which promote new particle formation (NPF) event in the roadside (Cheung et al, 2016;Gani et al, 2021;Nie et al, 2022). On the other hand, the peak hours variation of BC concentrations might be solely attributed to the higher number of vehicle flux observed in the morning period compared to the afternoon period (Lin et al, 2022). These findings further suggest the evidence of peaks period variations of UFPs PNC and BC concentrations that were successfully observed in this study.…”

Section: Peak Periods Concentrationsmentioning

confidence: 87%

“…This result is relatively similar to previous on-road study in the urban road of Taipei, Taiwan. It was reported that during rush hour period (08.00-10.30 and 17.00-19.30), the amount of UFPs PNC and BC concentrations significantly increased up to 34.80% and 31.80% (Lin et al, 2022). Furthermore, ~95% increase of traffic-related air pollutants (TRAPs) concentrations was also identified in the roadside area of urban highway in Oakland, USA during morning rush hour period (Gani et al, 2021).…”

Section: Peak Periods Concentrationsmentioning

confidence: 99%

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Characterizing Traffic-Related Ultrafine Particles in Roadside Microenvironments: Spatiotemporal Insights from Industrial Parks

Abdillah,

You,

Wang

2024

Aerosol Air Qual. Res.

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Ultrafine particles (UFPs; PM0.1) and black carbon (BC) were measured at different roadside microenvironments in the vicinity of the urban industrial park area. Simultaneous measurement campaigns were conducted at industrial roadside (IN), residential roadside (RS), and urban background (UB) throughout different seasons. Spatiotemporal variability as well as correlations between pollutants and confounding factors (traffic profiles and meteorological conditions) were analyzed. The observed average roadside UFPs particle number concentration (UFPs PNC) and BC concentrations were in the order of IN (38,000 ± 9,000 # cm -3 and 2,500 ± 600 ng m -3 ) > RS (25,000 ± 8,000 # cm -3 and 1,900 ± 300 ng m -3 ) > UB (23,000 ± 9,000 # cm -3 and 1,400 ± 300 ng m -3 ). Furthermore, 11.26%-16.06% and 20.35%-24.32% increases of the average UFPs PNC and BC mass concentrations were identified during cold period at all measurement sites. Additionally, peak average concentrations of UFPs PNC and BC were identified at IN and RS during morning rush-hour and weekdays periods, following the diurnal profiles of traffic flux compositions and total vehicle number per day. Intra-urban spatial variability of UFPs was identified between roadsides and urban background (IQR/M ratio ≥ 2, ρ ≤ 0.05), highlighting the heterogeneity characteristic of the pollutant. Both pollutants at IN and RS were significantly influenced by traffic activities, while at UB, they were associated with meteorological conditions and secondary emission. Elevated levels of pollutants identified in this study have exceeded typical "high-level" UFPs according to WHO AQG 2021, indicating an intensified exposure risk for pedestrians and residents. This study serves as reference for future epidemiological study related to roadside UFPs in typical urban microenvironments such as industrial park areas.

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