To identify major sources of ambient fine particulate matter (PM2. 5, dp< 2.5 µm) and
quantify their contributions in the state of California, positive matrix factorization (PMF)
receptor model was applied on speciation trends network (STN) data, collected between
2002 and 2007 at 8 distinct sampling locations, including El Cajon, Rubidoux, 5 Los
Angeles, Simi Valley, Bakersfield, Fresno, San Jose, and Sacramento. Between five to nine
sources of fine PM were identified at each sampling site, several of which were common …

To identify major sources of ambient fine particulate matter (PM 2.5, dp< 2.5 μm) and
quantify their contributions in the state of California, a positive matrix factorization (PMF)
receptor model was applied on Speciation Trends Network (STN) data, collected between
2002 and 2007 at eight distinct sampling locations, including El Cajon, Rubidoux, Los
Angeles, Simi Valley, Bakersfield, Fresno, San Jose, and Sacramento. Between five to nine
sources of fine PM were identified at each sampling site, several of which were common …