Metal-enriched nanoparticles and black carbon: A perspective from the Brazil railway system air pollution

Lima, Bianca D.; Teixeira, Elba Calesso; Hower, James C.; Civeira, Matheus S.; Ramírez, Omar; Yang, Cheng‐Xue; Oliveira, Marcos L.S.; Silva, Luis

doi:10.1016/j.gsf.2020.12.010

Cited by 24 publications

(7 citation statements)

References 81 publications

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“…The geometric mean concentration of BC (14.5 μg m −3 ) during OpHrs were ~21-times higher than those (0.7 μg m −3 ) during N-OpHrs (Table S3), suggesting that BC-rich particles are affected by aerosol settling processes and the lack of BC sources during N-OpHrs. In particular, BC concentrations ranged from 0.4 μg m −3 (P10) to 40.6 μg m −3 (P90) with a median of 14.3 μg m −3 , which is ~4.2-times higher than the reported median value (3.38 μg m −3 ) for the Brazil railway (ground-level platforms) by Lima et al (2021), and ~6.2-times the median value (2.3 ± 1.2 μg m −3 ) for New York roadside (ground-level) by Vilcassim et al (2014). However, the median value reported here is similar to those (14.0 ± 5.4 μg m −3 ) reported for the West 4th subway upper level (New York, USA; Vilcassim et al, 2014).…”

Section: Overview Of Particle Number and Mass Concentrationsmentioning

confidence: 73%

Characteristics of fine and ultrafine aerosols in the London underground

Kumar

Zavala‐Reyes²,

Kalaiarasan³

et al. 2023

Science of The Total Environment

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Section: Overview Of Particle Number and Mass Concentrationsmentioning

confidence: 73%

Characteristics of fine and ultrafine aerosols in the London underground

Kumar

Zavala‐Reyes²,

Kalaiarasan³

et al. 2023

Science of The Total Environment

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“…Even in developed countries, current levels of non-exhaust emissions and future forecasts are on the rise. Lima et al [10] observed that the link between traffic volume and non-exhaust emissions is non-linear. These emissions are affected by vehicles and the road conditions; low traffic volumes in bad conditions cause more pollution than high traffic volumes in good conditions.…”

Section: Introductionmentioning

confidence: 99%

Pollutants Concentration during the Construction and Operation Stages of a Long Tunnel: A Case Study of Lowari Tunnel, (Dir–Chitral), Khyber Pakhtunkhwa, Pakistan

et al. 2022

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Long tunnels with significant overburden, changeable geological conditions, a steep gradient, water infiltration, and heavy traffic flow are susceptible to environmental concerns during both construction and operation. The availability of fresh air and visibility is the most important necessity in excavation for tunnel workers inside the tunnel during the construction phase, as well as those crossing the tunnel during operation. Lowari Tunnel’s tunnel air pollutants were researched. Carbon monoxide (CO), carbon dioxide (CO2), oxygen (O2), hydrogen sulfide (H2S), sulfur dioxide (SO2), nitrogen oxide (NO), ammonia (NH3), nitrogen dioxide (NO2), PM1, PM2.5, PM10, air velocity, dust morphological and particle size distribution analysis are among the parameters under consideration. The findings provide evidence for the development of tunnel air quality.

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“…For this reason, many studies in the field of health risk assessment have addressed this issue, specifically on particulate matter produced by transport [ 4 , 5 , 6 , 7 , 8 , 9 ]; the research in this area is still receiving significant attention [ 10 , 11 , 12 ]. Nanoparticle health risks from ambient air found its attention slightly later but is also a substantial research field [ 13 , 14 , 15 , 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

Development of New Health Risk Assessment of Nanoparticles: EPA Health Risk Assessment Revised

et al. 2022

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The concentration of nanoparticles in the ambient air can lead to induced toxicities; however, it appears that nanoparticles’ unique properties are completely omitted when assessing health risks. This paper aims to enhance the EPA health risk assessment by incorporating two new variables that consider the size of nanoparticles: the toxicity multiplier and the size multiplier. The former considers the qualitative aspect of the size of particles within a concentration, whilst the latter takes into account the effects associated with the number of particles of the specific i-th size distribution interval. To observe the impact of the new variables, a case study was performed. The studied element was cadmium, which was measured using ICP-MS to discover concentrations of size fractions, ranging from <15.1 to <9830 nm. Next, the cadmium concentration is assessed using both the current state-of-the-art method and the proposed method with adjustments. Based on the new approach, the final risk was 1.1 × 10−5, which was almost 24 times higher compared with the current method. The contribution of nanoparticles to the risk value grew from barely 6% to an alarming 88%. Therefore, the enhanced method can lead to more realistic results when assessing the health risks of nanoparticles.

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Metal-enriched nanoparticles and black carbon: A perspective from the Brazil railway system air pollution

Cited by 24 publications

References 81 publications

Characteristics of fine and ultrafine aerosols in the London underground

Characteristics of fine and ultrafine aerosols in the London underground

Pollutants Concentration during the Construction and Operation Stages of a Long Tunnel: A Case Study of Lowari Tunnel, (Dir–Chitral), Khyber Pakhtunkhwa, Pakistan

Development of New Health Risk Assessment of Nanoparticles: EPA Health Risk Assessment Revised

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