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Wang Z, Wang R, Wang J, Wang Y, McPherson Donahue N, Tang R, Dong Z, Li X, Wang L, Han Y, Cao J. The seasonal variation, characteristics and secondary generation of PM 2.5 in Xi'an, China, especially during pollution events. ENVIRONMENTAL RESEARCH 2022; 212:113388. [PMID: 35569537 DOI: 10.1016/j.envres.2022.113388] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Revised: 04/26/2022] [Accepted: 04/27/2022] [Indexed: 06/15/2023]
Abstract
As an important central city in western China, Xi'an has the worst atmospheric pollution record in China and many measures have been taken to improve the air quality in the past few years. In this study, PM2.5 samples were collected across four seasons from 2017 to 2018 in Xi'an. Organic carbon and elemental carbon, water soluble ions, and elements were monitored to assess the air quality. The average annual PM2.5 concentration was (134.9 ± 48.1 μg/m3), with the highest concentration in winter (188.8 ± 93.2 μg/m3), and lowest concentration in summer (71.2 ± 12.1 μg/m3). The secondary generation of sulfate (SO42-) and nitrate (NO3-) was strong in spring, and secondary organic carbon (SOC) was formed in all seasons. The compositions of PM2.5 changed greatly during a sandstorm occurred and the Spring Festival. The sandstorm played a positive role in removing local pollutant NO3-, but also increased the concentration of SO42-, however both the concentration of SO42- and NO3- greatly increased by secondary generation during Spring Festival. Potential source analysis showed that during the sandstorm, pollutants were transported over a long distance from the northwest of China, whereas it was mainly from the local and surrounded emissions during the Spring Festival. Except Ca2+ and geological dust (GM), the other components in PM2.5 increased significantly on the day of the Spring Festival. During sampling time in Xi'an, the positive matrix factorization (PMF) model analysis showed that PM2.5 mainly came from vehicle emission, coal combustion, and biomass burning.
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Affiliation(s)
- Zedong Wang
- National Demonstration Center for Experimental Geography Education, School of Geography and Tourism, Shaanxi Normal University, Xi'an, China
| | - Runyu Wang
- National Demonstration Center for Experimental Geography Education, School of Geography and Tourism, Shaanxi Normal University, Xi'an, China
| | - Jingzhi Wang
- National Demonstration Center for Experimental Geography Education, School of Geography and Tourism, Shaanxi Normal University, Xi'an, China; Key Lab of Aerosol Chemistry & Physics, State Key Lab of Loess and Quaternary Geology (SKLLQG), Key Laboratory of Aerosol Chemistry and Physics, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, China; Center for Atmospheric Particles Studies, Carnegie Mellon University, Pittsburgh, PA, USA; Guangdong Provincial Key Laboratory of Utilization and Protection of Environmental Resource, State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry Chinese Academy of Science, Guangzhou, China.
| | - Yumeng Wang
- National Demonstration Center for Experimental Geography Education, School of Geography and Tourism, Shaanxi Normal University, Xi'an, China
| | - Neil McPherson Donahue
- Center for Atmospheric Particles Studies, Carnegie Mellon University, Pittsburgh, PA, USA
| | - Rongzhi Tang
- School of Energy and Environment, City University of Hong Kong, Kowloon, Hong Kong, China
| | - Zhibao Dong
- National Demonstration Center for Experimental Geography Education, School of Geography and Tourism, Shaanxi Normal University, Xi'an, China
| | - Xiaoping Li
- National Demonstration Center for Experimental Geography Education, School of Geography and Tourism, Shaanxi Normal University, Xi'an, China
| | - Lijun Wang
- National Demonstration Center for Experimental Geography Education, School of Geography and Tourism, Shaanxi Normal University, Xi'an, China
| | - Yongming Han
- Key Lab of Aerosol Chemistry & Physics, State Key Lab of Loess and Quaternary Geology (SKLLQG), Key Laboratory of Aerosol Chemistry and Physics, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, China
| | - Junji Cao
- Key Lab of Aerosol Chemistry & Physics, State Key Lab of Loess and Quaternary Geology (SKLLQG), Key Laboratory of Aerosol Chemistry and Physics, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, China; Institute of Atmospheric Physics, Chinese Academy of Sciences, China
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Zhang CH, Sears L, Myers JV, Brock GN, Sears CG, Zierold KM. Proximity to coal-fired power plants and neurobehavioral symptoms in children. JOURNAL OF EXPOSURE SCIENCE & ENVIRONMENTAL EPIDEMIOLOGY 2022; 32:124-134. [PMID: 34257388 PMCID: PMC8275639 DOI: 10.1038/s41370-021-00369-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2020] [Revised: 06/30/2021] [Accepted: 07/01/2021] [Indexed: 05/15/2023]
Abstract
BACKGROUND Coal-fired power plants are a major source of air pollution that can impact children's health. Limited research has explored if proximity to coal-fired power plants contributes to children's neurobehavioral disorders. OBJECTIVE This community-based study collected primary data to investigate the relationships of residential proximity to power plants and neurobehavioral problems in children. METHODS 235 participants aged 6-14 years who lived within 10 miles of two power plants were recruited. Exposure to particulate matter ≤10 μm (PM10) was measured in children's homes using personal modular impactors. Neurobehavioral symptoms were assessed using the Child Behavior Checklist (CBCL). Multiple regression models were performed to test the hypothesized associations between proximity/exposure and neurobehavioral symptoms. Geospatial statistical methods were used to map the spatial patterns of exposure and neurobehavioral symptoms. RESULTS A small proportion of the variations of neurobehavioral problems (social problems, affective problems, and anxiety problems) were explained by the regression models in which distance to power plants, traffic proximity, and neighborhood poverty was statistically associated with the neurobehavioral health outcomes. Statistically significant hot spots of participants who had elevated levels of attention deficit hyperactivity disorder, anxiety, and social problems were observed in the vicinity of the two power plants. SIGNIFICANCE Results of this study suggest an adverse impact of proximity to power plants on children's neurobehavioral health. Although coal-fired power plants are being phased out in the US, health concern about exposure from coal ash storage facilities remains. Furthermore, other countries in the world are increasing coal use and generating millions of tons of pollutants and coal ash. Findings from this study can inform public health policies to reduce children's risk of neurobehavioral symptoms in relation to proximity to power plants.
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Affiliation(s)
- Charlie H Zhang
- Department of Geography & Geosciences, University of Louisville, Louisville, KY, USA
| | - Lonnie Sears
- Department of Pediatrics, University of Louisville, Louisville, KY, USA
| | - John V Myers
- Department of Biomedical Informatics and Center for Biostatistics, The Ohio State University, Columbus, OH, USA
| | - Guy N Brock
- Department of Biomedical Informatics and Center for Biostatistics, The Ohio State University, Columbus, OH, USA
| | - Clara G Sears
- Department of Epidemiology, Brown University, Providence, RI, USA
| | - Kristina M Zierold
- Department of Environmental Health Sciences, University of Alabama at Birmingham, Birmingham, AL, USA.
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Nanoparticle Emission and Characterization from Pre-Dried Lignite and Bituminous Coal Co-Combustion. ENERGIES 2020. [DOI: 10.3390/en13092373] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Nowadays, the high share of electricity production from renewables drives coal-fired power plants to adopt a more flexible operation scheme and, at the same time, maintain flue gas emissions within respective standards. A 500 kWth pulverized coal furnace was used to study pre-dried lignite combustion or co-combustion as an available option for these plants. Bituminous coal from Czech Republic and pre-dried lignite from Greece were blended for the experiments. Particle emissions measurements with a heated Electrical Low Pressure Impactor (ELPI+) and Scanning Electron Microscopy with Energy Dispersive Spectroscopy (SEM/EDS) analyses were performed. The effect of the pre-dried lignite proportions in the fuel feed and the combustion conditions regarding the combustion air staging were the two parameters selected for this study. Skeletal density values were measured from the cyclone prior to the impactor. Results are depicted with respect to the aerodynamic and Stokes diameter for impactor stages. The presence of pre-dried lignite in the fuel blend lowers the particle matter (PM) PM2.5, PM1 and PM0.1 emissions, thus having a positive impact on ESP’s fractional and overall efficiency. The staged combustion air feed reduces the particle emissions in all cases. Sulfur content follows a pattern of higher concentration values for finer particles.
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Samara C, Argyropoulos G, Grigoratos T, Kouras Α, Manoli Ε, Andreadou S, Pavloudakis F, Sahanidis C. Chemical characterization and receptor modeling of PM 10 in the surroundings of the opencast lignite mines of Western Macedonia, Greece. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:12206-12221. [PMID: 28707246 DOI: 10.1007/s11356-017-9655-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2017] [Accepted: 06/27/2017] [Indexed: 06/07/2023]
Abstract
The Western Macedonian Lignite Center (WMLC) in northwestern Greece is the major lignite center in the Balkans feeding four major power plants of total power exceeding 4 GW. Concentrations of PM10 (i.e., particulate matters with diameters ≤10 μm) are the main concern in the region, and the high levels observed are often attributed to the activities related to power generation. In this study, the contribution of fugitive dust emissions from the opencast lignite mines to the ambient levels of PM10 in the surroundings was estimated by performing chemical mass balance (CMB) receptor modeling. For this purpose, PM10 samples were concurrently collected at four receptor sites located in the periphery of the mine area during the cold and the warm periods of the year (November-December 2011 and August-September 2012), and analyzed for a total of 26 macro- and trace elements and ionic species (sulfate, nitrate, chloride). The robotic chemical mass balance (RCMB) model was employed for source identification/apportionment of PM10 at each receptor site using as inputs the ambient concentrations and the chemical profiles of various sources including the major mine operations, the fly ash escaping the electrostatic filters of the power plants, and other primary and secondary sources. Mean measured PM10 concentrations at the different sites ranged from 38 to 72 μg m-3. The estimated total contribution of mines ranged between 9 and 22% in the cold period increasing to 36-42% in the dry warm period. Other significant sources were vehicular traffic, biomass burning, and secondary sulfate and nitrate aerosol. These results imply that more efficient measures to prevent and suppress fugitive dust emissions from the mines are needed.
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Affiliation(s)
- Constantini Samara
- Environmental Pollution Control Laboratory, Department of Chemistry, Aristotle University, 54124, Thessaloniki, Greece.
| | - George Argyropoulos
- Environmental Pollution Control Laboratory, Department of Chemistry, Aristotle University, 54124, Thessaloniki, Greece
| | - Theodoros Grigoratos
- Environmental Pollution Control Laboratory, Department of Chemistry, Aristotle University, 54124, Thessaloniki, Greece
| | - Αthanasios Kouras
- Environmental Pollution Control Laboratory, Department of Chemistry, Aristotle University, 54124, Thessaloniki, Greece
| | - Εvangelia Manoli
- Environmental Pollution Control Laboratory, Department of Chemistry, Aristotle University, 54124, Thessaloniki, Greece
| | - Symela Andreadou
- West Macedonia Lignite Center, Environment and Mine Support Division, Public Power Corporation S.A., 24630-28601, Ptolemaida, Greece
| | - Fragkiskos Pavloudakis
- West Macedonia Lignite Center, Environment and Mine Support Division, Public Power Corporation S.A., 24630-28601, Ptolemaida, Greece
| | - Chariton Sahanidis
- West Macedonia Lignite Center, Environment and Mine Support Division, Public Power Corporation S.A., 24630-28601, Ptolemaida, Greece
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Argyropoulos G, Samara C, Diapouli E, Eleftheriadis K, Papaoikonomou K, Kungolos A. Source apportionment of PM 10 and PM 2.5 in major urban Greek agglomerations using a hybrid source-receptor modeling process. THE SCIENCE OF THE TOTAL ENVIRONMENT 2017; 601-602:906-917. [PMID: 28582736 DOI: 10.1016/j.scitotenv.2017.05.088] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2017] [Revised: 05/04/2017] [Accepted: 05/10/2017] [Indexed: 06/07/2023]
Abstract
A hybrid source-receptor modeling process was assembled, to apportion and infer source locations of PM10 and PM2.5 in three heavily-impacted urban areas of Greece, during the warm period of 2011, and the cold period of 2012. The assembled process involved application of an advanced computational procedure, the so-called Robotic Chemical Mass Balance (RCMB) model. Source locations were inferred using two well-established probability functions: (a) the Conditional Probability Function (CPF), to correlate the output of RCMB with local wind directional data, and (b) the Potential Source Contribution Function (PSCF), to correlate the output of RCMB with 72h air-mass back-trajectories, arriving at the receptor sites, during sampling. Regarding CPF, a higher-level conditional probability function was defined as well, from the common locus of CPF sectors derived for neighboring receptor sites. With respect to PSCF, a non-parametric bootstrapping method was applied to discriminate the statistically significant values. RCMB modeling showed that resuspended dust is actually one of the main barriers for attaining the European Union (EU) limit values in Mediterranean urban agglomerations, where the drier climate favors build-up. The shift in the energy mix of Greece (caused by the economic recession) was also evidenced, since biomass burning was found to contribute more significantly to the sampling sites belonging to the coldest climatic zone, particularly during the cold period. The CPF analysis showed that short-range transport of anthropogenic emissions from urban traffic to urban background sites was very likely to have occurred, within all the examined urban agglomerations. The PSCF analysis confirmed that long-range transport of primary and/or secondary aerosols may indeed be possible, even from distances over 1000km away from study areas.
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Affiliation(s)
- G Argyropoulos
- Environmental Pollution Control Laboratory, Department of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.
| | - C Samara
- Environmental Pollution Control Laboratory, Department of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
| | - E Diapouli
- National Centre of Scientific Research "Demokritos", Institute of Nuclear Technology and Radiation Protection, Environmental Research Laboratory, 15310 Ag. Paraskevi, Attiki, Greece
| | - K Eleftheriadis
- National Centre of Scientific Research "Demokritos", Institute of Nuclear Technology and Radiation Protection, Environmental Research Laboratory, 15310 Ag. Paraskevi, Attiki, Greece
| | - K Papaoikonomou
- Department of Planning and Regional Development, University of Thessaly, 38334 Volos, Greece
| | - A Kungolos
- Department of Planning and Regional Development, University of Thessaly, 38334 Volos, Greece
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Manousakas M, Papaefthymiou H, Diapouli E, Migliori A, Karydas AG, Bogdanovic-Radovic I, Eleftheriadis K. Assessment of PM2.5 sources and their corresponding level of uncertainty in a coastal urban area using EPA PMF 5.0 enhanced diagnostics. THE SCIENCE OF THE TOTAL ENVIRONMENT 2017; 574:155-164. [PMID: 27631196 DOI: 10.1016/j.scitotenv.2016.09.047] [Citation(s) in RCA: 98] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2016] [Revised: 08/31/2016] [Accepted: 09/07/2016] [Indexed: 05/22/2023]
Abstract
Datasets that include only the PM elemental composition and no other important constituents such as ions and OC, should be treated carefully when used for source apportionment. This work is demonstrating how a source apportionment study utilizing PMF 5.0 enhanced diagnostic tools can achieve an improved solution with documented levels of uncertainty for such a dataset. The uncertainty of the solution is rarely reported in source apportionment studies or it is reported partially. Reporting the uncertainty of the solution is very important especially in the case of small datasets. PM2.5 samples collected in Patras during the year 2011 were used. The concentrations of 22 elements (Z=11-33) were determined using PIXE. Source apportionment analysis revealed that PM2.5 emission sources were biomass burning (11%), sea salt (8%), shipping emissions (10%), vehicle emissions (33%), mineral dust (2%) and secondary sulfates (33%) while unaccounted mass was 3%. Although Patras city center is located in a very close proximity to the city's harbor, the contribution of shipping originating emissions was never before quantified. As rotational stability is hard to be achieved when a small dataset is used the rotational stability of the solution was thoroughly evaluated. A number of constraints were applied to the solution in order to reduce rotational ambiguity.
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Affiliation(s)
- M Manousakas
- E.R.L., Institute of Nuclear & Radiological Sciences & Technology, Energy & Safety, N.C.S.R. Demokritos, 15310 Ag. Paraskevi, Attiki, Greece.
| | - H Papaefthymiou
- Department of Chemistry, University of Patras, 26500 Patras, Achaia, Greece
| | - E Diapouli
- E.R.L., Institute of Nuclear & Radiological Sciences & Technology, Energy & Safety, N.C.S.R. Demokritos, 15310 Ag. Paraskevi, Attiki, Greece
| | - A Migliori
- Physics Section, International Atomic Energy Agency, Vienna International Centre, PO Box 100, A-1400 Vienna, Austria
| | - A G Karydas
- Physics Section, International Atomic Energy Agency, Vienna International Centre, PO Box 100, A-1400 Vienna, Austria; Institute of Nuclear and Particle Physics, NCSR "Demokritos", 153 10 Ag. Paraskevi, Athens, Greece
| | | | - K Eleftheriadis
- E.R.L., Institute of Nuclear & Radiological Sciences & Technology, Energy & Safety, N.C.S.R. Demokritos, 15310 Ag. Paraskevi, Attiki, Greece
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Argyropoulos G, Besis A, Voutsa D, Samara C, Sowlat MH, Hasheminassab S, Sioutas C. Source apportionment of the redox activity of urban quasi-ultrafine particles (PM0.49) in Thessaloniki following the increased biomass burning due to the economic crisis in Greece. THE SCIENCE OF THE TOTAL ENVIRONMENT 2016; 568:124-136. [PMID: 27295587 DOI: 10.1016/j.scitotenv.2016.05.217] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2016] [Revised: 05/11/2016] [Accepted: 05/30/2016] [Indexed: 05/27/2023]
Affiliation(s)
| | - Athanasios Besis
- Department of Chemistry, Environmental Pollution Control Laboratory, Greece
| | - Dimitra Voutsa
- Department of Chemistry, Environmental Pollution Control Laboratory, Greece
| | - Constantini Samara
- Department of Chemistry, Environmental Pollution Control Laboratory, Greece.
| | - Mohammad Hossein Sowlat
- University of Southern California, Department of Civil and Environmental Engineering, United States
| | - Sina Hasheminassab
- University of Southern California, Department of Civil and Environmental Engineering, United States
| | - Constantinos Sioutas
- University of Southern California, Department of Civil and Environmental Engineering, United States
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