Nanoparticles in road dust from impervious urban surfaces: distribution, identification, and environmental implications

Yang, Yi; Vance, Marina E.; Tou, Fei-yun; Tiwari, Andrea J.; Liu, Min; Hochella, Michael F.

doi:10.1039/c6en00056h

Cited by 76 publications

(79 citation statements)

References 55 publications

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“…On a site scale, the eddy-flux based particle exchange measurement carried out in Rome during a period that falls within the time period investigated here, were similar in range and pattern compared with our model results (Fares et al, 2013) although resuspension is calculated to be lower (see Figure S4). Since the net removal as indicted by the measurements is considerably negative, particles may not only originate from previous plant deposition but also from other surfaces in the vicinity (Yang et al, 2016).…”

Section: Particulate-matter Deposition and Comparison With Literaturementioning

confidence: 95%

Deposition and Resuspension Mechanisms Into and From Tree Canopies: A Study Modeling Particle Removal of Conifers and Broadleaves in Different Cities

Pace

Grote

2020

Front. For. Glob. Change

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With increasing realization that particles in the air are a major health risk in urban areas, strengthening particle deposition is discussed as a means to air-pollution mitigation. Particles are deposited physically on leaves and thus the process depends on leaf area and surface properties, which change throughout the year. Current state-of-the-art modeling accounts for these changes only by altering leaf longevity, which may be selected by vegetation type and geographic location. Particle removal also depends on weather conditions, which determine deposition and resuspension but generally do not consider properties that are specific to species or plant type. In this study, we modeled < 2.5 µm-diameter particulate-matter (PM 2.5) deposition, resuspension, and removal from urban trees along a latitudinal gradient (Berlin, Munich, Rome) while comparing coniferous with broadleaf (deciduous and evergreen) tree types. Accordingly, we re-implemented the removal functionality from the i-Tree Eco model, investigated the uncertainty connected with parameterizations, and evaluated the efficiency of pollution mitigation depending on city conditions. We found that distinguishing deposition velocities between conifers and broadleaves is important for model results, i.e., because the removal efficiency of conifers is larger. Because of the higher wind speed, modeled PM 2.5 deposition from conifers is especially large in Berlin compared to Munich and Rome. Extended periods without significant precipitation decrease the amount of PM 2.5 removal because particles that are not occasionally washed from the leaves or needles are increasingly resuspended into the air. The model predicted this effect particularly during the long summer periods in Rome with only very little precipitation and may be responsible for less-efficient net removal from urban trees under climate change. Our analysis shows that the range of uncertainty in particle removal is large and that parameters have to be adjusted at least for major tree types if not only the species level. Furthermore, evergreen trees (broadleaved as well as coniferous) are predicted to be more effective at particle removal in northern regions than in Mediterranean cities, which is unexpected given the higher number of evergreens in southern cities. We discuss to what degree the effect of current PM 2.5 abundance can be mitigated by species selection and which model improvements are needed.

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Section: Particulate-matter Deposition and Comparison With Literaturementioning

confidence: 95%

Deposition and Resuspension Mechanisms Into and From Tree Canopies: A Study Modeling Particle Removal of Conifers and Broadleaves in Different Cities

Pace

Grote

2020

Front. For. Glob. Change

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“…In this study (and several others), nanomaterial translocation was sizedependent; smaller nanoparticles showed greater translocation and accumulation. Another recent and particularly revealing study (79) found magnetite (Fe 3 O 4 ) incidental nanoparticles, clearly produced by fuel combustion as evidenced by its crystal morphology (80), in human brain tissue. These high-temperature-formed nanomaterials can enter the brain directly through the olfactory bulb (78) and are thought to have potentially negative consequences on brain health.…”

Section: Nanomaterials and Biological Systemsmentioning

confidence: 96%

Natural, incidental, and engineered nanomaterials and their impacts on the Earth system

Hochella

Mogk

Ranville

et al. 2019

Science

Self Cite

580

354

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Nanomaterials are critical components in the Earth system’s past, present, and future characteristics and behavior. They have been present since Earth’s origin in great abundance. Life, from the earliest cells to modern humans, has evolved in intimate association with naturally occurring nanomaterials. This synergy began to shift considerably with human industrialization. Particularly since the Industrial Revolution some two-and-a-half centuries ago, incidental nanomaterials (produced unintentionally by human activity) have been continuously produced and distributed worldwide. In some areas, they now rival the amount of naturally occurring nanomaterials. In the past half-century, engineered nanomaterials have been produced in very small amounts relative to the other two types of nanomaterials, but still in large enough quantities to make them a consequential component of the planet. All nanomaterials, regardless of their origin, have distinct chemical and physical properties throughout their size range, clearly setting them apart from their macroscopic equivalents and necessitating careful study. Following major advances in experimental, computational, analytical, and field approaches, it is becoming possible to better assess and understand all types and origins of nanomaterials in the Earth system. It is also now possible to frame their immediate and long-term impact on environmental and human health at local, regional, and global scales.

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“…(33) This finding motivated a thorough characterization of ultrafine particles, which have shown elevated concentrations of transition metals. (37)(38)(39)(40) These studies become really relevant considering magnetic INPs found in the brain contained traces of other transition metals including nickel (Ni), platinum (Pt), cobalt (Co) and possibly copper (Cu). (33) Detailed size and composition characterization of INPs is required to better understand their potential implications.…”

Section: Introductionmentioning

confidence: 99%

Size, composition, morphology, and health implications of airborne incidental metal-containing nanoparticles

Gonzalez‐Pech

Stebounova

Ustunol

et al. 2019

Journal of Occupational and Environmental Hygiene

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There is great concern in the adverse health implications of engineered nanoparticles. However, there are many circumstances where the production of incidental nanoparticles, i.e., nanoparticles unintentionally generated as a side product of some anthropogenic process, is of even greater concern. In this study, metal-based incidental nanoparticles were measured in two occupational settings: a machining center and a foundry. On-site characterization of substrate-deposited incidental nanoparticles using a field-portable X-ray fluorescence provided some insights into the chemical characteristics of these metal-containing particles. The same substrates were then used to carry out further off-site analysis including single particle analysis using scanning electron microscopy and energy-dispersive X-ray spectroscopy. Between the two sites, there were similarities in the size and composition of the incidental nanoparticles as well as in the agglomeration and coagulation behavior of nanoparticles. In particular, incidental nanoparticles were identified in two forms: sub-micrometer fractal-like agglomerates from activities such as welding and super-micrometer particles with incidental nanoparticles coagulated to their surface, herein referenced as nanoparticle collectors. These agglomerates will affect deposition and transport inside the respiratory system of the respirable incidental nanoparticles and the corresponding health implications. The studies of incidental nanoparticles generated in occupational settings lay the groundwork on which occupational health and safety protocols should be built.

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Nanoparticles in road dust from impervious urban surfaces: distribution, identification, and environmental implications

Abstract: Nanoparticles (NPs) resulting from urban road dust resuspension are an understudied class of pollutants in urban environments with strong potential for health hazards.

Cited by 76 publications

References 55 publications

Deposition and Resuspension Mechanisms Into and From Tree Canopies: A Study Modeling Particle Removal of Conifers and Broadleaves in Different Cities

Deposition and Resuspension Mechanisms Into and From Tree Canopies: A Study Modeling Particle Removal of Conifers and Broadleaves in Different Cities

Natural, incidental, and engineered nanomaterials and their impacts on the Earth system

Size, composition, morphology, and health implications of airborne incidental metal-containing nanoparticles

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