Temperature inversion and mixing height: critical indicators for air pollution in hot arid climate

Al-Hemoud, Ali; Al-Sudairawi, Mane; Al-Rashidi, Mufreh; Behbehani, Weam; Al-Khayat, Ahmed

doi:10.1007/s11069-019-03631-2

Cited by 26 publications

(18 citation statements)

References 37 publications

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“…This trend was attributed to decreased mixing height from temperature inversions created by a change in temperature. These inversions trapped pollution and restricted vertical mixing, making pollution stagnant, thus increasing PM 2.5 concentrations [ 38 , 39 ]. Increased rainfall reduced PM 2.5 concentration through wet deposition by washing out the particles from the atmosphere [ 40 ].…”

Section: Resultsmentioning

confidence: 99%

An Assessment of Annual Mortality Attributable to Ambient PM2.5 in Bangkok, Thailand

Fold

Allison

Wood

et al. 2020

IJERPH

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Multiple studies indicate that PM2.5 is the most deleterious air pollutant for which there are ambient air quality standards. Daily concentrations of PM2.5 in Bangkok, Thailand, continuously exceed the World Health Organization (WHO) and the Thai National Ambient Air Quality Standards (NAAQSs). Bangkok has only recently begun to measure concentrations of PM2.5. To overcome this paucity of data, daily PM2.5/PM10 ratios were generated over the period 2012–2018 to interpolate missing values. Concentration-response coefficients (β values) for PM2.5 versus non-accidental, cardiopulmonary, and lung cancer mortalities were derived from the literature. Values were also estimated and were found to be comparable to those reported in the literature for a Chinese population, but considerably lower than those reported in the literature from the United States. These findings strongly suggest that specific regional β values should be used to accurately quantify the number of premature deaths attributable to PM2.5 in Asian populations. Health burden analysis using the Environmental Benefits Mapping and Analysis Program (BenMAP) showed that PM2.5 concentration in Bangkok contributes to 4240 non-accidental, 1317 cardiopulmonary, and 370 lung cancer mortalities annually. Further analysis showed that the attainment of PM2.5 levels to the NAAQSs and WHO guideline would reduce annual premature mortality in Bangkok by 33%and 75%, respectively.

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Section: Resultsmentioning

confidence: 99%

An Assessment of Annual Mortality Attributable to Ambient PM2.5 in Bangkok, Thailand

Fold

Allison

Wood

et al. 2020

IJERPH

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“…During the non curfew hours, vehicle traffic was reduced considerably, and activities of major industrial operations slowed down, and consequently, the pollution ‘carry-over effect’ toward the curfew hours was marginal. Yet, this conclusion must be interpreted with caution as there is an inherent difference between diurnal and nocturnal variations in the boundary layer and mixing height [55] . The statistically significant and (insignificant) differences between the curfew and non curfew hours in PM 10 before and after the removal of the ‘dust effect’ indicate the substantial contribution of natural dust emission to coarse particles in the urban areas.…”

Section: Discussionmentioning

confidence: 96%

PM2.5 and PM10 during COVID-19 lockdown in Kuwait: Mixed effect of dust and meteorological covariates

Al-Hemoud

Al-Khayat

Al‐Dashti³

et al. 2021

Environmental Challenges

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This study investigated the impact of COVID-19 lockdown on particulate matter concentrations, specifically PM 2.5 and PM 10 , in Kuwait. We studied the variations in PM 2.5 and PM 10 between the lockdown in 2020 with the corresponding periods of the years 2017–2019, and also investigated the differences in PM variations between the ‘curfew’ and ‘non curfew’ hours. We applied mixed-effect regression to investigate the factors that dictate PM variability (i.e., dust and meteorological covariates), and also processed satellite-based aerosol optical depths (AOD) to determine the spatial variability in aerosol loads. The results showed low PM 2.5 concentration during the lockdown (33 μg/m 3 ) compared to the corresponding previous three years (2017–2019); however, the PM 10 concentration (122.5 μg/m 3 ) increased relative to 2017 (116.6 μg/m 3 ), and 2019 (92.8 μg/m 3 ). After removing the ‘dust effects’, both PM 2.5 and PM 10 levels dropped by 18% and 31%, respectively. The mixed-effect regression model showed that high temperature and high wind speed were the main contributors to high PM 2.5 and PM 10 , respectively, in addition to the dust haze and blowing dust. This study highlights that the reductions of anthropogenic source emissions are overwhelmed by dust events and adverse meteorology in arid regions, and that the lockdown did not reduce the high concentrations of PM in Kuwait.

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“…However, there are many factors in atmosphere which play an important role in air quality variation. For instance, temperature inversion and mixing height is critical indicators for air pollution in hot arid climate [6]; stable ground inversion layer could make air pollution become more serious with the discharge of pollutants [7]. To take a step further, the inversion is associated with wind speed maxima and strong vertical wind speed gradients [6].…”

Section: Introductionmentioning

confidence: 99%

“…For instance, temperature inversion and mixing height is critical indicators for air pollution in hot arid climate [6]; stable ground inversion layer could make air pollution become more serious with the discharge of pollutants [7]. To take a step further, the inversion is associated with wind speed maxima and strong vertical wind speed gradients [6]. Furthermore, NOₓ (CO) is positively (negatively) associated with relative humidity from January to April in Addis Ababa, Ethiopia [8].…”

Section: Introductionmentioning

confidence: 99%

Impact of COVID-19 Lockdown and Atmospheric Circulation on the Air Quality in Wuhan During Early 2020

Xie

Zhi

2021

E3S Web Conf.

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Previous studies indicated that the air quality was improved in Wuhan during COVID-19 lockdown. However, the impact of atmospheric general circulation on the changes of air quality has not been taken into account. The present study aims to discuss the improvement of air quality in Wuhan and its possible reasons during COVID-19 lockdown. The results showed that all air pollutants except O3 decreased in Wuhan during early 2020. The occurrence days of A, C, W and NW types’ circulation pattern during early 2020 are more than those during the same period of 1979-2020. The occurrence days of SW type’s circulation pattern is slightly less than those during early 1979-2020. With more occurrence days of these dominant atmospheric circulation patterns, the number of polluted days could rise in Wuhan during early 2020. Nevertheless, this scenario didn’t occur. The COVID-19 lockdown did improve the air quality in Wuhan during early 2020.

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Temperature inversion and mixing height: critical indicators for air pollution in hot arid climate

Cited by 26 publications

References 37 publications

An Assessment of Annual Mortality Attributable to Ambient PM2.5 in Bangkok, Thailand

An Assessment of Annual Mortality Attributable to Ambient PM2.5 in Bangkok, Thailand

PM2.5 and PM10 during COVID-19 lockdown in Kuwait: Mixed effect of dust and meteorological covariates

Impact of COVID-19 Lockdown and Atmospheric Circulation on the Air Quality in Wuhan During Early 2020

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