Sources Affecting PM2.5 Concentrations at a Rural Semi-Arid Coastal Site in South Texas

DOI: 10.4236/jep.2013.41018   PDF   HTML   XML   3,264 Downloads   4,904 Views   Citations


Principal component analysis/absolute principal component scores (PCA/APCS) and positive matrix factorization (PMF2), an advanced factor analysis technique were employed to apportion the sources influencing the PM2.5 levels measured during 2003 through 2005 at a rural coastal site located within the Corpus Christi urban airshed in South Texas. PCA/APCS identified five sources while PMF2 apportioned an optimal solution of eight sources. Both PCA/APCS and PMF2 quantified secondary sulfates to be the major contributor accounting for 47% and 45% of the apportioned PM2.5 levels. The other common sources apportioned by the models included crustal dust, fresh sea salt and traffic emissions. PMF2 successfully apportioned distinct sources of fresh and aged sea salt along with biomass burns while PCA/APCS was unsuccessful in identifying aged sea salt and biomass burns; however it successfully identified secondary organic aerosols from photochemical oxidations and also emitted by petrochemical refineries. The influence of long range transport was noted for sources such as secondary sulfates, biomass burns and crustal dust affecting the region. Continued collection of speciation data at the rural and urban sites will enhance the understanding of local versus regional source contributions for air quality policy makers and stakeholders.

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S. Karnae and K. John, "Sources Affecting PM2.5 Concentrations at a Rural Semi-Arid Coastal Site in South Texas," Journal of Environmental Protection, Vol. 4 No. 1, 2013, pp. 152-162. doi: 10.4236/jep.2013.41018.

Conflicts of Interest

The authors declare no conflicts of interest.


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