Results 261 to 270 of about 73,958 (307)

Source apportionment of indoor air pollution

Atmospheric Environment (1967), 1987
Abstract An understanding of the relative contributions from important pollutant sources to human exposures is necessary for the design and implementation of effective control strategies. In the past, societal efforts to control air pollution have focused almost exclusively on the outdoor (ambient) environment.
Ken Sexton, Steven B. Hayward
openaire   +1 more source

Source Apportionment: Principles and Methods

2016
Receptor model source apportionment has been facilitated by the availability of particulate matter (PM) speciation networks that measure elements, ions, and carbon fractions, and the availability of effective variance (EV)- and positive matrix factorization (PMF)-chemical mass balance (CMB) solutions to identify and quantify source contributions ...
J. G. Watson, J. C. Chow, L.-W. A. Chen, G. Engling, X. L. Wang   +4 more
openaire   +1 more source

Source apportionment of fine particles in Kuwait City

Science of The Total Environment, 2013
This study investigated major sources of PM2.5 in the atmosphere of Kuwait based on a sampling program conducted between February 2004 and October 2005. Three source identification techniques were used in this study: (1) a positive matrix factorization model; (2) backward trajectory profiles; and (3) concentration rose plots.
Mohammad A, Alolayan, Kathleen W, Brown, John S, Evans, Walid S, Bouhamra, Petros, Koutrakis   +4 more
openaire   +2 more sources

Groundwater Pollution Characteristics and Source Apportionment

2018
The chapter elaborates on the analysis of groundwater hydro-chemical characteristic, assessing the groundwater quality and groundwater pollution according to the groundwater quality data collected in the 2005 and judging the sources of groundwater pollution according to the distribution of land use, pollutant sources and concentration of typical ...
Huan Huan, Jianwei Xu, Jinsheng Wang, Beidou Xi   +3 more
openaire   +1 more source

Source Apportionment: Findings from the U.S. Supersites Program

Journal of the Air & Waste Management Association, 2008
Receptor models are used to identify and quantify source contributions to particulate matter and volatile organic compounds based on measurements of many chemical components at receptor sites. These components are selected based on their consistent appearance in some source types and their absence in others.
John G, Watson, L W Antony, Chen, Judith C, Chow, Prakash, Doraiswamy, Douglas H, Lowenthal   +4 more
openaire   +2 more sources

Source apportionment of ambient VOCs in Delhi City

Science of The Total Environment, 2005
Source apportionment using chemical mass balance (CMB) model was carried using a data set of 360 four hourly samples collected at 15 locations of five categories namely residential, commercial, industrial, traffic intersections and petrol pumps during August 2001-July 2002 in Delhi.
Anjali, Srivastava, B, Sengupta, S A, Dutta   +2 more
openaire   +2 more sources

Selecting an Appropriate Multivariate Source Apportionment Model Result

Environmental Science & Technology, 2010
Two easily available multivariate source apportionment models, Unmix and positive matrix factorization (PMF), often produce nearly the same source apportionment. However, this paper gives two examples in which this is not the case: a simulated air pollution data set of 8 species and 200 samples and a water quality data set of 32 PCB congeners and 106 ...
Ronald C, Henry, Erik R, Christensen
openaire   +2 more sources

Source apportionment of PM2.5 in Beijing in 2004

Journal of Hazardous Materials, 2007
Based on measurements of fine particulate matter (PM2.5, i.e., particles with an aerodynamic diameter of 2.5 microm or less) in January and August 2004, serious air pollution persists in Beijing. The chemical analysis included organic and elemental carbon, water-soluble ions, and elemental compositions.
Yu, Song, Xiaoyan, Tang, Shaodong, Xie, Yuanhang, Zhang, Yongjie, Wei, Minsi, Zhang, Limin, Zeng, Sihua, Lu   +7 more
openaire   +2 more sources

Review of receptor modeling methods for source apportionment

Journal of the Air & Waste Management Association, 2016
Efforts have been made to relate measured concentrations of airborne constituents to their origins for more than 50 years. During this time interval, there have been developments in the measurement technology to gather highly time-resolved, detailed chemical compositional data.
openaire   +2 more sources

European source area apportionment

Journal of Aerosol Science, 1988
Erik Swietlicki, Birgitta Svantesson, Hans-Christen Hansson   +2 more
openaire   +1 more source