Reconstructing Primary and Secondary Components of PM2.5 Composition for an Urban Atmosphere
Sailesh N. Behera,Mukesh Sharma +1 more
TLDR
In this paper, a total 360 PM25 samples were collected from six sampling sites for summer and winter seasons in Kanpur city, India and the collected PM25 mass was subjected to chemical speciation for: (1) ionic species (NH+ 4, SO2-4, NO 3, and Cl 3), (2) carbon contents (EC and OC), and (3) elemental contents (Ca, Mg, Na, K, Al, Si, Fe, Ti, Mn, V, Cr, Ni, Zn, Cd, Pb,Abstract:
Total 360 samples (of 8 h each) of PM25 were collected from six sampling sites for summer and winter seasons in Kanpur city, India The collected PM25 mass was subjected to chemical speciation for: (1) ionic species (NH+ 4, SO2– 4, NO– 3, and Cl–), (2) carbon contents (EC and OC), and (3) elemental contents (Ca, Mg, Na, K, Al, Si, Fe, Ti, Mn, V, Cr, Ni, Zn, Cd, Pb, Cu, As, and Se) Primary and secondary components of PM25 were assessed from speciation results The influence of marine source to PM25 was negligible, whereas the contribution of crustal dust was significant (10% in summer and 7% in winter) A mass reconstruction approach for PM25 could distinctly establish primary and secondary components of measured PM25 as: (1) Primary component (27% in summer and 24% in winter): crustal, elemental carbon, and organic mass, (2) Secondary component (45% in summer and 50% in winter): inorganic and organic mass, and (3) others: unidentified mass (27% in summer and 26% in winter) The secondary inorganic read more
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Environmentally persistent free radicals (EPFRs) in PM₂.₅ : their contribution to hydroxyl radical formation and atmospheric transformation
TL;DR: In this paper, the nature of environmentally persistent free radicals (EPFRs) in ambient PM2.5 under simulated atmospheric conditions was investigated, and the degradation of the EPFRs was found to result from reaction with oxygen and strengthened from an overall shift in the EPR g-factor.
Journal ArticleDOI
Multi-pollutant air quality analyses and apportionment of sources in three particle size categories at Taj Mahal, Agra
Pavan K. Nagar,Prashant Gargava,Vijay K. Shukla,Mukesh Sharma,Ashutosh K. Pathak,Dhirendra Singh +5 more
TL;DR: A study was conducted at the Taj Mahal in Agra, India to measure PM2.5, PM10, TSP and their chemical composition: metals, ions, elemental and organic carbons and molecular markers (polyaromatic hydrocarbons, n-alkanes, hopanes and sterols).
Proceedings ArticleDOI
Impact of Wildfires on Atmospheric Ammonia Concentrations in the US: Coupling Satellite and Ground Based Measurements
TL;DR: In this article, the authors examined four major science questions using satellite and in-situ data from 2010-2014: (1) How have concentrations of ammonia changed across the US? (2) how have the strength and frequency of fires changed? (3) How has this change in fires impacted ammonia emissions? (4) How does the US EPA NEI compare with the calculated emissions?
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Zn2+ loading as a critical contributor to the circ_0008553-mediated oxidative stress and inflammation in response to PM2.5 exposures.
Jing-zi Wang,Jianbo Jia,Du-Jia Wang,Xiujiao Pan,Haiyan Xiong,Chengjun Li,Yiguo Jiang,Bing Yan +7 more
TL;DR: In this paper , a novel circRNA circ_0008553 was identified to be responsible for the PM2.5-activated inflammatory response in human bronchial epithelial cells (16HBE) via inducing oxidative stress.
Journal ArticleDOI
Effects of economic structural transition on PM2.5-Related Human Health Impacts in China
TL;DR: In this article, the relative contributions of the changes in economic structural factors (including production structure, final demand structure, and emission source structure) to changes in China's PM2.5-Related Human Health Impacts (PM2-HHI) were analyzed.
References
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Journal ArticleDOI
Species contributions to PM2.5 mass concentrations: Revisiting common assumptions for estimating organic mass
Barbara J. Turpin,Ho-Jin Lim +1 more
TL;DR: The authors revisited common assumptions for estimating PM2.5 mass concentration and found that these assumptions can be used to estimate organic mass in a wide range of scenarios, such as PM1.5.
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Identification of secondary organic aerosol episodes and quantitation of primary and secondary organic aerosol concentrations during SCAQS
TL;DR: In this paper, the authors used the 1987 Southern California Air Quality Study (SCAQS) data to gain an understanding of the dynamics of organic aerosol formation and to quantify secondary organic emissions.
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Chemical composition of emissions from urban sources of fine organic aerosol
TL;DR: In this paper, a dilution source sampling system was used to collect primary organic aerosol emissions from important sources, including a boiler burning No 2 fuel, a home fireplace, a fleet of catalyst-equipped and non-catalyst automobiles, heavy-duty diesel trucks, natural gas home appliances, and meat cooking operations.
Journal ArticleDOI
Characterisation of PM10 and PM2.5 particulate matter in the ambient air of Milan (Italy)
TL;DR: In this article, the mass concentrations of the two fractions showed significant daily variations linked to different thermodynamic conditions of the planetary boundary layer (PBL) and characterised by higher values during wintertime.
Journal ArticleDOI
Variability of aerosol parameters over Kanpur, northern India
Ramesh P. Singh,Ramesh P. Singh,Sagnik Dey,Sachchida Nand Tripathi,Vinod Tare,Brent N. Holben +5 more
TL;DR: Aerosol optical properties and spectral behavior of the aerosol optical depth (AOD) over Kanpur, an urban industrial city in the Ganga basin, have been presented for the first time in this paper.
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