Characterization and source apportionment of ambient air particulate matter (PM2.5) in Karachi.

Concentrations and source apportionment of PM(2.5) monitored at an urban residential site in Karachi Metropolitan, Pakistan have been reported in this paper. PM(2.5) aerosol samples were collected on alternative days (three times per week) for 24-hrs duration on Zefluor(TM) filter papers using Thermo-Electron Corporation Reference Ambient Air Sampler (RAAS). A total of 402 samples were collected from January 2006 to January 2008. According to results high PM(2.5) loads were observed in post monsoon months that is about 2 times than those observed in the summer and monsoon seasons in the yearlong measurements. The collected samples were analyzed using ICP-MS for trace metal concentration. Source apportionment was performed on PM samples using Positive Matrix Factorization (PMF) model. The results derived from PMF model indicated five (05) major contributors to PM(2.5) in Karachi which were: soil/road dust, industrial emissions, vehicular emissions, sea salt originated from Arabian Sea and secondary aerosols.

[1]  A. Gupta,et al.  Source apportionment of PM10 at residential and industrial sites of an urban region of Kolkata, India , 2007 .

[2]  J. Schwartz,et al.  Is Daily Mortality Associated Specifically with Fine Particles? , 1996, Journal of the Air & Waste Management Association.

[3]  S. Liu,et al.  Metal Compositions of PM10 and PM(subscript 2.5) Aerosols in Taipei during Spring, 2002 , 2004 .

[4]  G. Arbilla,et al.  Formaldehyde and acetaldehyde in a high traffic street of Rio de Janeiro, Brazil , 2003 .

[5]  P. Biswas,et al.  Spatial and temporal variations of PM2.5 concentration and composition throughout an urban area with high freeway density—the Greater Cincinnati study , 2004 .

[6]  M. Shah,et al.  A Study of Airborne Selected Metals and Particle Size Distribution in Relation to Climatic Variables and their Source Identification , 2005 .

[7]  P. Kothai,et al.  Characterization of Atmospheric Particulate Matter using PIXE Technique , 2009 .

[8]  P. Paatero,et al.  Positive matrix factorization: A non-negative factor model with optimal utilization of error estimates of data values† , 1994 .

[9]  Myoungwoo Kim,et al.  Analysis of Trace Elements and Ions in Ambient Fine Particulate Matter at Three Elementary Schools in Ohio , 2007, Journal of the Air & Waste Management Association.

[10]  Mukesh Sharma,et al.  Assessment of ambient air PM10 and PM2.5 and characterization of PM10 in the city of Kanpur, India , 2005 .

[11]  D. Dockery,et al.  An association between air pollution and mortality in six U.S. cities. , 1993, The New England journal of medicine.

[12]  P. Paatero.  Least squares formulation of robust non-negative factor analysis , 1997 .

[13]  M. Mansha,et al.  Development of baseline (air quality) data in Pakistan , 2007, Environmental monitoring and assessment.

[14]  P. Paatero,et al.  Analysis of different modes of factor analysis as least squares fit problems , 1993 .

[15]  Khalid Mohammed Khan,et al.  Ambient air quality of two metropolitan cities of Pakistan and its health implications , 2001 .

[16]  F. Dominici,et al.  Fine particulate air pollution and mortality in 20 U.S. cities, 1987-1994. , 2000, The New England journal of medicine.

[17]  Antonella Zanobetti,et al.  The concentration-response relation between PM(2.5) and daily deaths. , 2002, Environmental health perspectives.

[18]  P. Lioy,et al.  Acidic sulfate aerosols: characterization and exposure. , 1989, Environmental health perspectives.

[19]  Najat A. Saliba,et al.  Concentration measurements and chemical composition of PM10-2.5 and PM2.5 at a coastal site in Beirut, Lebanon , 2004 .

[20]  Junfeng Liu,et al.  Evaluating inter-continental transport of fine aerosols:(2) Global health impact , 2009 .

[21]  Shoaib Shafique,et al.  Particulate matter (PM2.5) concentration and source apportionment in lahore , 2009 .

[22]  Munir H. Shah,et al.  Annual and Seasonal Variations of Trace Metals in Atmospheric Suspended Particulate Matter in Islamabad, Pakistan , 2008 .

[23]  P. Hopke,et al.  Atmospheric Chemistry and Physics Source apportionment of PM 2 . 5 in Seoul , Korea , 2009 .

[24]  M. Navarro,et al.  Levels of selected metals in ambient air PM10 in an urban site of Zaragoza (Spain). , 2005, Environmental research.

[25]  M. Shah,et al.  Distribution of lead in relation to size of airborne particulate matter in Islamabad, Pakistan. , 2004, Journal of environmental management.

[26]  K. Valsaraj,et al.  Atmospheric Aerosols: Characterization, Chemistry, Modeling, and Climate , 2009 .