Simulations of the impacts of building height layout on air quality in natural-ventilated rooms around street canyons

Yang, Fang; Zhong, Ke; Chen, Yonghang; Kang, Yanming

doi:10.1007/s11356-017-9934-0

Cited by 13 publications

(5 citation statements)

References 63 publications

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“…Air pollution is affected by many factors, such as pollution sources, meteorological conditions [13][14][15], geographical location [16][17][18][19], human activities [20,21], and industrial production [22,23]. Some scholars developed a consumption-based emission inventory for air pollutants in the years 2007 and 2012 [24].…”

Section: Introductionmentioning

confidence: 99%

Analysis on the Characteristics of Air Pollution in China during the COVID-19 Outbreak

Chen

Huang

et al. 2021

Atmosphere

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The COVID-19 pandemic poses a serious global threat to human health. In China, the government immediately implemented lockdown measures to curb the spread of this virus. These measures severely affected transportation and industrial production across the country, resulting in a significant change in the concentration of air pollutants. In this study, the Euclidean distance method was used to select the most similar meteorological field during the COVID-19 lockdown period. Changes in the concentration of air pollutants in China were analyzed under similar meteorological background conditions. Results indicate that, compared with data from 2015–2019, air quality in China significantly improved; with the exception of ozone (O3), the concentration of major air pollutants declined. Compared with baseline conditions, the reduction of air pollutants in China from 25 January to 22 February 2020 (Period 2) was the most significant. In particular, NO2 decreased by 41.7% in the Yangtze River Delta. In Period 2, the reduction of air pollutants in areas other than Hubei gradually decreased, but the reduction of NO2 in Wuhan reached 61.92%, and the reduction of air pollutants in various regions after February 23 was significantly reduced. By excluding the influence of meteorological factors and calculating the contribution of human activities to atmospheric pollutants by linear fitting, in Period 2 the effect of artificial controls on NO2 in Wuhan attained 30.66%, and reached 48.17% from 23 February to 23 March (Period 3). Results from this investigation provides effective theoretical support for pollution prevention and control in China.

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Section: Introductionmentioning

confidence: 99%

Analysis on the Characteristics of Air Pollution in China during the COVID-19 Outbreak

Chen

Huang

et al. 2021

Atmosphere

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“…However, lots of researchers think that ventilation capacity is the most effective method to guarantee indoor air quality (IAQ), so IAQ is strongly dependent on the environment of the street canyon [90][91][92]. Especially for buildings located in an area with serious outdoor air pollution, the coupling between indoor and outdoor air does not effectively improve IAQ but instead even aggravates indoor pollution in some cases [93].…”

Section: Relationship With Indoor Air Qualitymentioning

confidence: 99%

A Review on the Dispersion and Distribution Characteristics of Pollutants in Street Canyons and Improvement Measures

Zang

2021

Energies

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The air quality in a street canyon seriously affects the exposure level of pollutants for pedestrians and is directly related to the indoor air quality (IAQ) of surrounding buildings. In order to improve the street canyon environment, it is necessary to clarify the distribution and dispersion characteristics of pollutants. Through field tests, wind tunnel experiments, and numerical simulation, the current research studied the nature of pollutants in street canyons and provided some improvement measures. This paper comprehensively introduces the characteristics of pollutants in street canyons and reviews past studies on the following parts: (a) the dispersion principle and main impact factors of pollutants in street canyons, (b) the spatial and temporal distribution of pollutants in street canyons, (c) the relationship between pollutants in street canyons and indoor air quality, and (d) improvement measures of the street canyon environment. The dispersion of pollutants is dominated by the air exchange between the street canyon and the upper atmosphere, which is strengthened when the wind speed is high or when the temperature in the street canyon is obviously higher than the surrounding area. The heat island effect is beneficial for pollutant dispersion, while the inversion layer has a negative influence. Dense buildings mean lower pollutant diffusion capacity, which causes pollutants to easily gather. Pollutants tend to accumulate on the leeward side of buildings. The concentration of pollutants decreases with the increase of height and drops to the background level at a height of several hundred meters. The temporal distribution of pollutants in street canyons varies in diurnal, weekly, and annual periods, and the concentration peaks in the winter morning and summer evening. Besides, pollutants in street canyons have a significant influence on IAQ. To improve the street canyon environment, green belts and other facilities should be reasonably set up in the streets. Future research should pay attention to comprehensive test data, solving disagreement conclusions, and quantitative evaluation of the various impact factors on pollutants, etc.

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“…Without considering solar radiation Xie et al [18], Yang et al [19], and Hao et al [20] reported that the flow patterns are strongly related to the asymmetry aspect ratio (the ratio between the leeward and windward building heights) for 2D models. The change in flow patterns could further affect the dilution potential of in-canyon traffic-induced pollutants.…”

Section: Introductionmentioning

confidence: 99%

“…It is found that pollutant levels are raised in a step-down street canyon (higher buildings upstream) but reduced in a step-up street canyon (higher buildings downstream) in twodimensional (2D) models. Moreover, the influence of asymmetric aspect ratios (upwind building height to downwind building height) on the pollutant dispersion process was investigated by Yang et al [19] and Hao et al [20]. Yang et al [19] showed that asymmetric aspect ratios from 2/7 to 7/2 are favorable for the realization of higher air quality.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, the influence of asymmetric aspect ratios (upwind building height to downwind building height) on the pollutant dispersion process was investigated by Yang et al [19] and Hao et al [20]. Yang et al [19] showed that asymmetric aspect ratios from 2/7 to 7/2 are favorable for the realization of higher air quality. According to Hao et al [20], an increase of the height of a windward building of the step-up notch hinders the diffusion of pollutants.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of height-asymmetric street canyon configurations on outdoor air temperature and air quality

Zhang

Wen

et al. 2020

Building and Environment

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Simulations of the impacts of building height layout on air quality in natural-ventilated rooms around street canyons

Cited by 13 publications

References 63 publications

Analysis on the Characteristics of Air Pollution in China during the COVID-19 Outbreak

Analysis on the Characteristics of Air Pollution in China during the COVID-19 Outbreak

A Review on the Dispersion and Distribution Characteristics of Pollutants in Street Canyons and Improvement Measures

Effects of height-asymmetric street canyon configurations on outdoor air temperature and air quality

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