A review on particulate matter removal capacity by urban forests at different scales

Han, Donghui; Shen, Hailong; Duan, Wenbiao; Chen, Lixin

doi:10.1016/j.ufug.2019.126565

Cited by 119 publications

(64 citation statements)

References 118 publications

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“…Therefore, urban trees can contribute to improving human well-being through natural purification of air pollutants and particulate matter [9]. Because of this, urban greenspace plays an important role in cities, and the selection of tolerant tree species is essential to reform air quality in urban greenspace planning [10,11]. Overall, the findings of the studies mentioned above have suggested less of a causal relationship between exposure to air pollution and health outcomes in areas with more green space, although several recent studies revealed no significant correlations [12,13].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Importance of Some East Asian Tree Species for Refinement of Air Quality by Estimating Air Pollution Tolerance Index, Anticipated Performance Index, and Air Pollutant Uptake

et al. 2020

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Potentials of tree species as biofilters depend on appropriate selection based on their tolerance to air pollution, which is usually evaluated by the air pollution tolerance index (APTI) and anticipated performance index (API). Thus, these index values need as a means of scientific understanding to assess the role of urban trees for better greenspace planning/management to mitigate impacts of gaseous air pollution such as ozone (O3) and sulfur dioxide (SO2). O3 exposure to Chionanthus retusus, Pinus densiflora, and Ginkgo biloba showed higher stomatal O3 flux than the others, finally resulting in both favoring stomatal movement and maintaining carbon fixation. In contrast, despite the whole tree enhanced SO2 uptake under excess SO2 exposure, the carbon assimilation capacity was only found in Taxus cuspidata and Zelkova serrata as a consequence of no stomatal sluggishness. On the basis of API, P. densiflora and Prunus × yedoensis were good performers for developing greenspace, while Z. serrata and G. biloba were moderate performers; however, C. retusus and T. cuspidata were estimated to be poor and very poor performers, respectively, for reducing the air quality injury caused by air pollutants. The present study suggests that an integration of both APTI and API based on stomatal absorption flux is needed for selecting sound tree-species in greenspace planning/construction to control gaseous air pollutions.

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Section: Introductionmentioning

confidence: 99%

Evaluation of the Importance of Some East Asian Tree Species for Refinement of Air Quality by Estimating Air Pollution Tolerance Index, Anticipated Performance Index, and Air Pollutant Uptake

et al. 2020

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“…For other ecosystems services, the interactions between tree and soil processes and the built environment will determine the net influence of urban forests. For example, the effects of buildings, street design, and urban morphology on atmospheric dispersion, and their interactions with tree canopies, play a significant role in atmospheric pollutant concentrations (Han et al, 2020). Integrating trees into the built environment may also facilitate interventions to increase active transportation (Tsai et al, 2019;Young et al, 2020).…”

Section: Discussionmentioning

confidence: 99%

“…Tools such as iTree 1 translated the relatively scant data on urban tree processes available at the time-primarily estimates of biomass and dry deposition rates-into easily understood, municipalscale metrics, such as tons of pollution absorbed (Tallis et al, 2011), energy savings (McPherson, 1993, C sequestered (Nowak, 1993), and total monetary value (McPherson, 1992;. However, since these tools were originally developed, additional empirical studies of the influence of trees on pollution concentrations have reported negligible or inconsistent impacts (Setälä et al, 2013;Han et al, 2020), or even increases in the residence time of particulate and NO 2 concentrations in the atmosphere in the presence of tree canopies (Tong et al, 2015;Viippola et al, 2018). When atmospheric mixing is low, pollutants may be concentrated under tree canopies (Salmond et al, 2013), and when atmospheric mixing is high, studies have shown no discernable effect of the presence of trees on urban pollutant concentrations (Figure 1).…”

Section: Urban Trees Are More Effective For Adaptation Than Mitigation Strategiesmentioning

confidence: 99%

The Benefits and Limits of Urban Tree Planting for Environmental and Human Health

et al. 2021

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Many of the world’s major cities have implemented tree planting programs based on assumed environmental and social benefits of urban forests. Recent studies have increasingly tested these assumptions and provide empirical evidence for the contributions of tree planting programs, as well as their feasibility and limits, for solving or mitigating urban environmental and social issues. We propose that current evidence supports local cooling, stormwater absorption, and health benefits of urban trees for local residents. However, the potential for urban trees to appreciably mitigate greenhouse gas emissions and air pollution over a wide array of sites and environmental conditions is limited. Consequently, urban trees appear to be more promising for climate and pollution adaptation strategies than mitigation strategies. In large part, this is due to space constraints limiting the extent of urban tree canopies relative to the current magnitude of emissions. The most promising environmental and health impacts of urban trees are those that can be realized with well-stewarded tree planting and localized design interventions at site to municipal scales. Tree planting at these scales has documented benefits on local climate and health, which can be maximized through targeted site design followed by monitoring, adaptive management, and studies of long-term eco-evolutionary dynamics.

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“…The deposition rate is also sensitive to weather conditions [3,14]. Leaf PM deposition velocity was found to increase with increasing wind speed [15,16], and PM removal rates from the leaf surface were found to be correlated with high rainfall intensity and duration [17]. Therefore, urban green areas have different effects of PM reduction that depend on their structure and the meteorological factors that affect PM movement.…”

Section: Introductionmentioning

confidence: 99%

“…Most studies have focused on identifying the reduction of PM concentration with equations and chamber-based experiments [15][16][17], so the effects of reducing air pollutants through urban green space need to be verified in the field.…”

Section: Introductionmentioning

confidence: 99%

Importance of Urban Green at Reduction of Particulate Matters in Sihwa Industrial Complex, Korea

et al. 2020

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The utilization of urban green areas has increased, but it is unclear whether urban green areas can decrease the concentration of particulate matter at an industrial complex city in Korea. We measured the extent of particulate matter (PM) reduction at a buffer green area in the Sihwa Industrial Complex. PM was measured at the industrial complex, the urban green area, and a nearby residential area from April to October 2019. PM reduction rates were highest at the urban green area in August and October, which is related to increased atmospheric mixing height and the active west wind blowing from the industrial complex to the residential area. Reduction rates of PM10 and PM2.5 at the urban green area showed the lowest values, namely 14.4% and 25.3%, respectively. The air temperature, wind speed, and humidity could affect the PM reduction rate by influencing the movement and dispersion of PM at the micro-spatiotemporal scale. These results indicated that PM concentration could be reduced by the structural change of a forest layer at a micro scale in urban green areas.

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A review on particulate matter removal capacity by urban forests at different scales

Cited by 119 publications

References 118 publications

Evaluation of the Importance of Some East Asian Tree Species for Refinement of Air Quality by Estimating Air Pollution Tolerance Index, Anticipated Performance Index, and Air Pollutant Uptake

Evaluation of the Importance of Some East Asian Tree Species for Refinement of Air Quality by Estimating Air Pollution Tolerance Index, Anticipated Performance Index, and Air Pollutant Uptake

The Benefits and Limits of Urban Tree Planting for Environmental and Human Health

Importance of Urban Green at Reduction of Particulate Matters in Sihwa Industrial Complex, Korea

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