Results 261 to 270 of about 73,680 (311)

CMB Source Apportionment during REVEAL

Journal of Environmental Engineering, 1997
Source contributions to PM2.5 aerosol measured at Chilliwack and Pitt Meadows in the Lower Fraser Valley, B.C., Canada, during the REVEAL study, were estimated using chemical mass balance (CMB) receptor modeling. On average, motor vehicles accounted for 34 and 43% of PM2.5 at Chilliwack and Pitt Meadows, respectively.
Douglas H. Lowenthal, David Wittorff, Alan W. Gertler, Steve Sakiyama   +3 more
openaire   +1 more source

Mesothelioma: Risk Apportionment Among Asbestos Exposure Sources

Risk Analysis, 2005
The mesothelioma epidemic in the United States, which peaked during the 2000–2004 period, can be traced to high‐level asbestos exposures experienced by males in occupational settings prior to the full recognition of the disease‐causing potential of asbestos and the establishment of enforceable asbestos exposure limits by the Occupational Safety and ...
Bertram, Price, Adam, Ware
openaire   +2 more sources

PM2.5 Source Apportionment in China

2016
China has been facing a severe air pollution challenge in recent years. It is known that fine particulate matter is closely linked to haze. It is very important to have a good understanding of the formation mechanisms and sources of haze in China.
Mei Zheng, Caiqing Yan, Xiaoying Li
openaire   +1 more source

Optimized variable source-profile approach for source apportionment

Atmospheric Environment, 2007
Abstract An expanded chemical mass balance (CMB) approach for PM2.5 source apportionment is presented in which both the local source compositions and corresponding contributions are determined from ambient measurements and initial estimates of source compositions using a global-optimization mechanism.
Amit Marmur, James A. Mulholland, Armistead G. Russell   +2 more
openaire   +1 more source

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