Seok Won Kang, Sumin Lee, Jiyou Kwoun, Tae-Jung Lee, Youngchul Jo
Harmful heavy metals and carbonaceous substances contained in PM 2.5 collected from 53 schools located in large Korean cities were closely analyzed based on the hypothesis that emission sources such as automobiles are coincident. The average concentration of PM 2.5 from the analysis of all classrooms was 20.7 µ g m – 3 . Mn was the most prevalent heavy metal with a concentration of 0.018 µ g m – 3 , followed by Pb and Cu. The heavy metals were closely related to elemental carbon (EC) introduced mainly from the outside with a correlation coefficient of 0.556, showing consistent significance. Organic carbon (OC) showed a correlation coefficient of 0.357, which statistically supported the presence of obvious OC sources in the classroom. Overall school classroom contamination levels have been shown to be below national guideline.
{"title":"Analysis of Harmful Heavy Metals and Carbonaceous Components in Urban School PM2.5","authors":"Seok Won Kang, Sumin Lee, Jiyou Kwoun, Tae-Jung Lee, Youngchul Jo","doi":"10.4209/aaqr.220335","DOIUrl":"https://doi.org/10.4209/aaqr.220335","url":null,"abstract":"Harmful heavy metals and carbonaceous substances contained in PM 2.5 collected from 53 schools located in large Korean cities were closely analyzed based on the hypothesis that emission sources such as automobiles are coincident. The average concentration of PM 2.5 from the analysis of all classrooms was 20.7 µ g m – 3 . Mn was the most prevalent heavy metal with a concentration of 0.018 µ g m – 3 , followed by Pb and Cu. The heavy metals were closely related to elemental carbon (EC) introduced mainly from the outside with a correlation coefficient of 0.556, showing consistent significance. Organic carbon (OC) showed a correlation coefficient of 0.357, which statistically supported the presence of obvious OC sources in the classroom. Overall school classroom contamination levels have been shown to be below national guideline.","PeriodicalId":7402,"journal":{"name":"Aerosol and Air Quality Research","volume":null,"pages":null},"PeriodicalIF":4.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70294163","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
P. Broomandi, K. Mohammadpour, D. Kaskaoutis, A. Fathian, S. Abdullaev, V. Maslov, Amirhossein Nikfal, A. Jahanbakhshi, B. Aubakirova, J. Kim, A. Satyanaga, A. Rashki, Nick Middleton
A severe dust storm blanketing Central Asia on 3–4 November 2021 was investigated employing satellite remote-sensing, synoptic meteorological observations, reanalysis and HYSPLIT back-trajectories. The prevailing meteorological conditions showed an intensification of air subsidence over eastern Kazakhstan, featured in a typical omega-blocking system over the region and two troughs to its west and east axis, one day before the dust storm. The prevailing high-pressure system and temperature gradients over Kazakhstan modulated the dominant anticyclonic wind pattern generated from the south Balkhash basin toward the Caspian Sea, causing a huge dust storm that covered the southern half of Kazakhstan and large parts of Uzbekistan, Tajikistan and Turkmenistan. The dust storm originated in the steppes of southern Kazakhstan by violent downdraft winds. Initially it swept over eastern parts and then the whole of Uzbekistan, reaching the Caspian Sea in the west. Meteorological measurements and HYSPLIT back-trajectories at selected sites in Central Asia (Turkmenabat, Khujand and Tashkent) showed a remarkable dust impact that reduced temperature (by 2–4 ° C) and visibility to below 1 km at different periods, as the thick dust plume expanded in various directions. The extremely high PM concentrations (PM 10 > 10,000 µ g m –3 in Tashkent) could endanger both human health and the environment, especially in a region suffering from high susceptibility to wind erosion and significant land
{"title":"A Synoptic- and Remote Sensing-based Analysis of a Severe Dust Storm Event over Central Asia","authors":"P. Broomandi, K. Mohammadpour, D. Kaskaoutis, A. Fathian, S. Abdullaev, V. Maslov, Amirhossein Nikfal, A. Jahanbakhshi, B. Aubakirova, J. Kim, A. Satyanaga, A. Rashki, Nick Middleton","doi":"10.4209/aaqr.220309","DOIUrl":"https://doi.org/10.4209/aaqr.220309","url":null,"abstract":"A severe dust storm blanketing Central Asia on 3–4 November 2021 was investigated employing satellite remote-sensing, synoptic meteorological observations, reanalysis and HYSPLIT back-trajectories. The prevailing meteorological conditions showed an intensification of air subsidence over eastern Kazakhstan, featured in a typical omega-blocking system over the region and two troughs to its west and east axis, one day before the dust storm. The prevailing high-pressure system and temperature gradients over Kazakhstan modulated the dominant anticyclonic wind pattern generated from the south Balkhash basin toward the Caspian Sea, causing a huge dust storm that covered the southern half of Kazakhstan and large parts of Uzbekistan, Tajikistan and Turkmenistan. The dust storm originated in the steppes of southern Kazakhstan by violent downdraft winds. Initially it swept over eastern parts and then the whole of Uzbekistan, reaching the Caspian Sea in the west. Meteorological measurements and HYSPLIT back-trajectories at selected sites in Central Asia (Turkmenabat, Khujand and Tashkent) showed a remarkable dust impact that reduced temperature (by 2–4 ° C) and visibility to below 1 km at different periods, as the thick dust plume expanded in various directions. The extremely high PM concentrations (PM 10 > 10,000 µ g m –3 in Tashkent) could endanger both human health and the environment, especially in a region suffering from high susceptibility to wind erosion and significant land","PeriodicalId":7402,"journal":{"name":"Aerosol and Air Quality Research","volume":null,"pages":null},"PeriodicalIF":4.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70294342","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Chauhan, S. Acharjee, Ramesh P. Singh, B. Holben
Aerosols play an important role in the earth's environment across the globe through their involvement in various earth system cycles. The change in the aerosol properties may cause short and long-term impacts, the knowledge of such changes is useful in the estimation of the pollution sources of any region. We have carried out the analysis of the aerosols' optical and radiative properties using AERONET station data from 2018 to 2021 in Dibrugarh City. The higher Aerosol Optical Depth (AOD) values during winter and pre-monsoon months indicate high anthropogenic activities, and biomass burning in Dibrugarh. The impact of various sources and daily meteorological parameters help in understanding the diurnal variations of the AOD, Ångström Exponent (AE), and column water (CW). Fine aerosol fractions dominate the aerosol volume, but sometimes the long-range transport of dust affects aerosol properties during pre-monsoon months (MAM). MODIS-derived AOD and AERONET AOD values show a good correlation, with R 2 = 0.68. The highest volume of the aerosols reaches up to 0.11 µ m 3 µ m –2 during pre-monsoon months, whereas it lies below 0.05 µ m 3 µ m –2 in other seasons. SSA values indicate the presence of scattering aerosols but in 2020, a sudden decline in the SSA values shows a strong rise in the absorbing aerosols. Throughout the study period (2018–2021), the positive radiative forcing indicates a rise in atmospheric heating.
气溶胶通过参与各种地球系统循环，在全球地球环境中发挥着重要作用。气溶胶性质的变化可能造成短期和长期的影响，了解这种变化对估计任何地区的污染源都是有用的。我们利用2018年至2021年Dibrugarh市AERONET站的数据对气溶胶的光学和辐射特性进行了分析。冬季和季风前的气溶胶光学深度(AOD)值较高，表明Dibrugarh地区的人为活动和生物质燃烧较高。各种来源和日气象参数的影响有助于理解AOD、Ångström指数(AE)和柱水(CW)的日变化。细小的气溶胶组分在气溶胶体积中占主导地位，但有时沙尘的远距离输送会影响季风前月(MAM)的气溶胶特性。modis计算的AOD值与AERONET计算的AOD值具有良好的相关性，r2 = 0.68。在季风前月份，气溶胶的最高体积可达0.11 μ m 3 μ m -2，而在其他季节则低于0.05 μ m 3 μ m -2。SSA值表明散射气溶胶的存在，但在2020年，SSA值的突然下降表明吸收气溶胶的强烈上升。在整个研究期间(2018-2021年)，正辐射强迫表明大气加热增加。
{"title":"Dynamic Characteristics of Aerosol Optical Properties over Dibrugarh City in the North-Eastern Indian Region during 2018–2021","authors":"A. Chauhan, S. Acharjee, Ramesh P. Singh, B. Holben","doi":"10.4209/aaqr.220320","DOIUrl":"https://doi.org/10.4209/aaqr.220320","url":null,"abstract":"Aerosols play an important role in the earth's environment across the globe through their involvement in various earth system cycles. The change in the aerosol properties may cause short and long-term impacts, the knowledge of such changes is useful in the estimation of the pollution sources of any region. We have carried out the analysis of the aerosols' optical and radiative properties using AERONET station data from 2018 to 2021 in Dibrugarh City. The higher Aerosol Optical Depth (AOD) values during winter and pre-monsoon months indicate high anthropogenic activities, and biomass burning in Dibrugarh. The impact of various sources and daily meteorological parameters help in understanding the diurnal variations of the AOD, Ångström Exponent (AE), and column water (CW). Fine aerosol fractions dominate the aerosol volume, but sometimes the long-range transport of dust affects aerosol properties during pre-monsoon months (MAM). MODIS-derived AOD and AERONET AOD values show a good correlation, with R 2 = 0.68. The highest volume of the aerosols reaches up to 0.11 µ m 3 µ m –2 during pre-monsoon months, whereas it lies below 0.05 µ m 3 µ m –2 in other seasons. SSA values indicate the presence of scattering aerosols but in 2020, a sudden decline in the SSA values shows a strong rise in the absorbing aerosols. Throughout the study period (2018–2021), the positive radiative forcing indicates a rise in atmospheric heating.","PeriodicalId":7402,"journal":{"name":"Aerosol and Air Quality Research","volume":null,"pages":null},"PeriodicalIF":4.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70294451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In the present study, water and saliva droplet evaporation rates are experimentally evaluated in various environmental conditions: temperature and relative humidity. We found that the ratio of saliva residue size to saliva initial droplet size is 0.216. We also found that the saliva correction factor which is defined as a ratio of water evaporation coefficient to saliva evaporation coefficient was not affected by environmental conditions and was determined as 0.857. By considering the evaporation and gravitational settling effects, the saliva airborne lifetime, i
{"title":"Saliva Droplet Evaporation Experiment and Simple Correlation of Evaporation-falling Curve under Different Temperatures and RH","authors":"Dong-Bin Kwak, Hayden D. Fischer, D. Pui","doi":"10.4209/aaqr.220409","DOIUrl":"https://doi.org/10.4209/aaqr.220409","url":null,"abstract":"In the present study, water and saliva droplet evaporation rates are experimentally evaluated in various environmental conditions: temperature and relative humidity. We found that the ratio of saliva residue size to saliva initial droplet size is 0.216. We also found that the saliva correction factor which is defined as a ratio of water evaporation coefficient to saliva evaporation coefficient was not affected by environmental conditions and was determined as 0.857. By considering the evaporation and gravitational settling effects, the saliva airborne lifetime, i","PeriodicalId":7402,"journal":{"name":"Aerosol and Air Quality Research","volume":null,"pages":null},"PeriodicalIF":4.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70295143","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J. Pariyothon, S. Bualert, Parkpoom Choomanee, T. Rungratanaubon, T. Thongyen, Narita Fakkaew, Chayaporn Phuetfoo, Jitlada Phupijit, W. Szymanski
Hygroscopic growth factor (Gf) of aerosols is related to water loading on particles in sub-saturated conditions. It is an essential parameter for assessing the role of atmospheric particles in the radiative transfer and cloud formation process. Therefore, the temporal variation in Gf of size-selected atmospheric particles from the Aitken mode (D p ≤ 100 nm) and accumulation mode (D p > 100 nm) was measured using a humidified tandem differential mobility analyser (H-TDMA) and the relationship between particle size and Gf for various locations and meteorological conditions was determined. The origin of ambient particles primarily defines their properties and governs their participation in atmospheric processes. Thus, the measurements were performed in locations with different land-use types: urban, rural, coastal-industrial, and landlocked industrial areas. The data showed site-dependent patterns of temporal and spatial changes in Gf. The results indicated that the number-weighted Gf averaged over the investigated particle size range (30–250 nm) was highest in rural areas (Gf = 1.27), followed by coastal-industrial (Gf = 1.19), urban (Gf = 1.11), and landlocked industrial areas (Gf = 1.06). Particles in the urban and landlocked industrial areas had relatively low Gf values, suggesting that they originated mainly from fossil fuel combustion, in contrast to particles at other sites which can be attributed to coastal proximity
{"title":"Hygroscopic Growth Factors of Sub-micrometer Atmospheric Aerosols at Four Selected Sites in Thailand","authors":"J. Pariyothon, S. Bualert, Parkpoom Choomanee, T. Rungratanaubon, T. Thongyen, Narita Fakkaew, Chayaporn Phuetfoo, Jitlada Phupijit, W. Szymanski","doi":"10.4209/aaqr.220374","DOIUrl":"https://doi.org/10.4209/aaqr.220374","url":null,"abstract":"Hygroscopic growth factor (Gf) of aerosols is related to water loading on particles in sub-saturated conditions. It is an essential parameter for assessing the role of atmospheric particles in the radiative transfer and cloud formation process. Therefore, the temporal variation in Gf of size-selected atmospheric particles from the Aitken mode (D p ≤ 100 nm) and accumulation mode (D p > 100 nm) was measured using a humidified tandem differential mobility analyser (H-TDMA) and the relationship between particle size and Gf for various locations and meteorological conditions was determined. The origin of ambient particles primarily defines their properties and governs their participation in atmospheric processes. Thus, the measurements were performed in locations with different land-use types: urban, rural, coastal-industrial, and landlocked industrial areas. The data showed site-dependent patterns of temporal and spatial changes in Gf. The results indicated that the number-weighted Gf averaged over the investigated particle size range (30–250 nm) was highest in rural areas (Gf = 1.27), followed by coastal-industrial (Gf = 1.19), urban (Gf = 1.11), and landlocked industrial areas (Gf = 1.06). Particles in the urban and landlocked industrial areas had relatively low Gf values, suggesting that they originated mainly from fossil fuel combustion, in contrast to particles at other sites which can be attributed to coastal proximity","PeriodicalId":7402,"journal":{"name":"Aerosol and Air Quality Research","volume":null,"pages":null},"PeriodicalIF":4.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70295316","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Xiong Yang, Haotu Zhong, Ying-shu Liu, Ning Sun, Ruixing Kuang, Cong Wang, Antao Zhan, Junrong Zhang, Qiming Tang, Ziyi Li
Volatile Organic Compounds (VOCs) are a class of pollutants that have recently received much attention in atmospheric and indoor air pollution problems. They are precursors for PM 2.5 and ozone generation. The removal of VOCs emitted from exhaust gases is an urgent problem to solve air pollution. Adsorption is one of the most promising VOC abatement technologies, with the advantages of high purification efficiency, low cost, and simple equipment. The adsorbent plays a critical role in VOCs removal efficiency. Zeolite is a rapidly developing material due to its highly ordered and flexible microporous structure, good stability, and abundant surface modification. In this paper, the influence of zeolite properties, including framework structure, pore properties, and surface cations, on VOCs adsorption performance is analyzed. The VOCs adsorption performance on different zeolite adsorbents in the presence of water vapor is compared. The influential factors on the mass transfer kinetic properties of VOCs adsorption are summarized. Finally, an overview of zeolite honeycomb adsorbent applications for industrial use is presented, including multi-tower fixed bed adsorption and zeolite rotor adsorption.
{"title":"Progress in Adsorptive Removal of Volatile Organic Compounds by Zeolites","authors":"Xiong Yang, Haotu Zhong, Ying-shu Liu, Ning Sun, Ruixing Kuang, Cong Wang, Antao Zhan, Junrong Zhang, Qiming Tang, Ziyi Li","doi":"10.4209/aaqr.220442","DOIUrl":"https://doi.org/10.4209/aaqr.220442","url":null,"abstract":"Volatile Organic Compounds (VOCs) are a class of pollutants that have recently received much attention in atmospheric and indoor air pollution problems. They are precursors for PM 2.5 and ozone generation. The removal of VOCs emitted from exhaust gases is an urgent problem to solve air pollution. Adsorption is one of the most promising VOC abatement technologies, with the advantages of high purification efficiency, low cost, and simple equipment. The adsorbent plays a critical role in VOCs removal efficiency. Zeolite is a rapidly developing material due to its highly ordered and flexible microporous structure, good stability, and abundant surface modification. In this paper, the influence of zeolite properties, including framework structure, pore properties, and surface cations, on VOCs adsorption performance is analyzed. The VOCs adsorption performance on different zeolite adsorbents in the presence of water vapor is compared. The influential factors on the mass transfer kinetic properties of VOCs adsorption are summarized. Finally, an overview of zeolite honeycomb adsorbent applications for industrial use is presented, including multi-tower fixed bed adsorption and zeolite rotor adsorption.","PeriodicalId":7402,"journal":{"name":"Aerosol and Air Quality Research","volume":null,"pages":null},"PeriodicalIF":4.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70295561","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Amja Manullang, C. Chung, Yueh-Lun Lee, T. Yuan, Huan M Tran, Firdian Makrufardi, K. Chung, Kang-Yun Lee, Jerjang Chang, H. Chuang
Chronic obstructive pulmonary disease (COPD) has been linked to air pollution exposure. Air pollution has been associated with eosinophilic inflammation of respiratory disease. The objective of this study was to determine associations between air pollution and eosinophilic inflammation in COPD. A cross-sectional study was conducted on 291 COPD patients recruited from hospitals in Taipei between January 2014 and 2021, including 147 patients with eosinophil blood count ≥ 2% and 144 patients < 2%. Land use regression (LUR) model was used to estimate exposure levels to particulate matter with an aerodynamic diameter of < 10 µ m (PM 10 ), PM 2.5 ( < 10 µ m), nitrogen oxides (NO x ) and nitrogen dioxides (NO 2 ). We investigated associations of air pollution with COPD outcomes by performing a linear regression approach. A two-pollutant approach was applied to examine the associations of PM 10 or PM 2.5 with NO x or NO 2 in COPD with eosinophilic inflammation. An increase of 1 µ g m –3 in PM 10 was associated with a 0.62% (95% CI: –1.10%, –0.13%) decrease in the forced vital capacity (FVC) in COPD. An increase of 1 µ g m –3 in PM 2.5 was associated with a 0.38% (95% CI: –0.71%, –0.05%) decrease in the FVC. A 1 µ g
{"title":"COPD with Eosinophilic Inflammation is Susceptible to Particulate Air Pollution Exposure","authors":"Amja Manullang, C. Chung, Yueh-Lun Lee, T. Yuan, Huan M Tran, Firdian Makrufardi, K. Chung, Kang-Yun Lee, Jerjang Chang, H. Chuang","doi":"10.4209/aaqr.230035","DOIUrl":"https://doi.org/10.4209/aaqr.230035","url":null,"abstract":"Chronic obstructive pulmonary disease (COPD) has been linked to air pollution exposure. Air pollution has been associated with eosinophilic inflammation of respiratory disease. The objective of this study was to determine associations between air pollution and eosinophilic inflammation in COPD. A cross-sectional study was conducted on 291 COPD patients recruited from hospitals in Taipei between January 2014 and 2021, including 147 patients with eosinophil blood count ≥ 2% and 144 patients < 2%. Land use regression (LUR) model was used to estimate exposure levels to particulate matter with an aerodynamic diameter of < 10 µ m (PM 10 ), PM 2.5 ( < 10 µ m), nitrogen oxides (NO x ) and nitrogen dioxides (NO 2 ). We investigated associations of air pollution with COPD outcomes by performing a linear regression approach. A two-pollutant approach was applied to examine the associations of PM 10 or PM 2.5 with NO x or NO 2 in COPD with eosinophilic inflammation. An increase of 1 µ g m –3 in PM 10 was associated with a 0.62% (95% CI: –1.10%, –0.13%) decrease in the forced vital capacity (FVC) in COPD. An increase of 1 µ g m –3 in PM 2.5 was associated with a 0.38% (95% CI: –0.71%, –0.05%) decrease in the FVC. A 1 µ g","PeriodicalId":7402,"journal":{"name":"Aerosol and Air Quality Research","volume":null,"pages":null},"PeriodicalIF":4.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70296863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Martin Nothhelfer, O. Sperber, A. Todea, Britta Schunke, Olga Romazanowa, Stefan Schumacher, D. Bathen, C. Asbach
The performance of low-cost particulate matter (PM) sensors (NovaFitness SDS011) in connection with a self-developed aerosol dryer has been investigated in ambient air measurements over a two-year period by comparing the reported mass concentration of particulate matter (PM x ) with the results of a PM 10 reference filter sampler and two Tapered Element Oscillating Microbalances (TEOM), one for PM 10 and one for PM 2.5 . Special emphasis was put on the effect of relative air humidity on sensor readings. In total, four sensors were used per year in two pairs. For one pair, the aerosol was dried with a newly developed low-cost aerosol dryer, whereas the other pair measured the untreated aerosol. The results show that the 24 h average concentration reported by the sensor could be by a factor of up to 38 too high compared to the gravimetric measurement, if the aerosol was not dried, whereas the mismatch with a maximum factor of 5.4 was significantly lower when using the dryer. For the PM 10 concentration correction factors were determined from the ratios of the measured 24 h values of the sensors and the gravimetric reference. Corrected 24 h mean PM 10 concentrations with dryer agreed mostly within a factor of 2 with the gravimetric reference data from the filter sampler, whereas results from measurements without dryer agreed only within a factor of 5. The results further show that the sensors underestimate the mass concentrations in case of low relative humidity ( < 45%). Similar results are seen for the PM 2.5 data as well. Therefore, the use of a constant correction factor was checked. It is shown that an average correction factor of around 2.5 for the PM 10 and around 2.6 for the PM 2.5 readings could be a reasonable approach for all SDS011 sensors equipped with the newly developed aerosol dryer.
{"title":"Effect of an Aerosol Dryer on Ambient PM Measurements with SDS011 Low Cost Sensors during a Two-year Period in Duisburg, Germany","authors":"Martin Nothhelfer, O. Sperber, A. Todea, Britta Schunke, Olga Romazanowa, Stefan Schumacher, D. Bathen, C. Asbach","doi":"10.4209/aaqr.230080","DOIUrl":"https://doi.org/10.4209/aaqr.230080","url":null,"abstract":"The performance of low-cost particulate matter (PM) sensors (NovaFitness SDS011) in connection with a self-developed aerosol dryer has been investigated in ambient air measurements over a two-year period by comparing the reported mass concentration of particulate matter (PM x ) with the results of a PM 10 reference filter sampler and two Tapered Element Oscillating Microbalances (TEOM), one for PM 10 and one for PM 2.5 . Special emphasis was put on the effect of relative air humidity on sensor readings. In total, four sensors were used per year in two pairs. For one pair, the aerosol was dried with a newly developed low-cost aerosol dryer, whereas the other pair measured the untreated aerosol. The results show that the 24 h average concentration reported by the sensor could be by a factor of up to 38 too high compared to the gravimetric measurement, if the aerosol was not dried, whereas the mismatch with a maximum factor of 5.4 was significantly lower when using the dryer. For the PM 10 concentration correction factors were determined from the ratios of the measured 24 h values of the sensors and the gravimetric reference. Corrected 24 h mean PM 10 concentrations with dryer agreed mostly within a factor of 2 with the gravimetric reference data from the filter sampler, whereas results from measurements without dryer agreed only within a factor of 5. The results further show that the sensors underestimate the mass concentrations in case of low relative humidity ( < 45%). Similar results are seen for the PM 2.5 data as well. Therefore, the use of a constant correction factor was checked. It is shown that an average correction factor of around 2.5 for the PM 10 and around 2.6 for the PM 2.5 readings could be a reasonable approach for all SDS011 sensors equipped with the newly developed aerosol dryer.","PeriodicalId":7402,"journal":{"name":"Aerosol and Air Quality Research","volume":null,"pages":null},"PeriodicalIF":4.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70297174","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Sreyashi Debnath, R. Karumuri, Gaurav Govardhan, R. Jat, Himadri Saini, Akash Vispute, S. Kulkarni, C. Jena, Rajesh Kumar, D. Chate, S. Ghude
{"title":"Corrigendum to “Implications of Implementing Promulgated and Prospective Emission Regulations on Air Quality and Health in India during 2030” [Aerosol Air Qual. Res. 22, 220112]","authors":"Sreyashi Debnath, R. Karumuri, Gaurav Govardhan, R. Jat, Himadri Saini, Akash Vispute, S. Kulkarni, C. Jena, Rajesh Kumar, D. Chate, S. Ghude","doi":"10.4209/aaqr.231001","DOIUrl":"https://doi.org/10.4209/aaqr.231001","url":null,"abstract":"","PeriodicalId":7402,"journal":{"name":"Aerosol and Air Quality Research","volume":null,"pages":null},"PeriodicalIF":4.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70297944","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Álvaro Clemente, Nuria Galindo, Jose F. Nicolás, Javier Crespo, Carlos Pastor, Eduardo Yubero
In this study, PM10 daily samples were collected every day during approximately one month in winter and one month in summer, 2019. Sampling was performed simultaneously at two different locations: an urban traffic site (~80 m a.s.l.) and a regional background station (~1500 m a.s.l.) in the western Mediterranean. The objective of this work was to investigate PM10 sources at both sites in order to determine regional and urban contributions to aerosol levels. Seven factors were obtained at both sites using Positive Matrix Factorisation (PMF): Saharan dust, Aged sea salt, Ammonium sulphate, Nitrate, Road traffic, Local dust and Fresh sea salt. At the urban site, the contribution of vehicle related sources (Road traffic, Nitrate and Local dust) was significantly higher in winter (~80%) than in summer (~60%). The average contribution of Saharan dust to PM10 levels was much larger at the mountain site (33%) than at the urban location (9%), due to the absence of significant anthropogenic emission sources in the vicinity of the regional background sampling station.
{"title":"Local versus Regional Contributions to PM10 Levels in the Western Mediterranean","authors":"Álvaro Clemente, Nuria Galindo, Jose F. Nicolás, Javier Crespo, Carlos Pastor, Eduardo Yubero","doi":"10.4209/aaqr.230218","DOIUrl":"https://doi.org/10.4209/aaqr.230218","url":null,"abstract":"In this study, PM10 daily samples were collected every day during approximately one month in winter and one month in summer, 2019. Sampling was performed simultaneously at two different locations: an urban traffic site (~80 m a.s.l.) and a regional background station (~1500 m a.s.l.) in the western Mediterranean. The objective of this work was to investigate PM10 sources at both sites in order to determine regional and urban contributions to aerosol levels. Seven factors were obtained at both sites using Positive Matrix Factorisation (PMF): Saharan dust, Aged sea salt, Ammonium sulphate, Nitrate, Road traffic, Local dust and Fresh sea salt. At the urban site, the contribution of vehicle related sources (Road traffic, Nitrate and Local dust) was significantly higher in winter (~80%) than in summer (~60%). The average contribution of Saharan dust to PM10 levels was much larger at the mountain site (33%) than at the urban location (9%), due to the absence of significant anthropogenic emission sources in the vicinity of the regional background sampling station.","PeriodicalId":7402,"journal":{"name":"Aerosol and Air Quality Research","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135507934","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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