ATMOSPHERIC AEROSOL SOURCE-RECEPTOR RELATIONSHIPS: THE ROLE OF COAL-FIRED POWER PLANTS Page: 3 of 38
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This report describes the technical progress made on the Pittsburgh Air Quality Study
(PAQS) during the period of August 2001 through January of 2002. The major activity
during this project period was the continuation of the ambient monitoring effort. Work
also progressed on organizing the upcoming source characterization effort, and there was
continued development of several three-dimensional air quality models. The first PAQS
data analysis workshop for the project was held at Carnegie Mellon in December 2001.
Two new instruments were added to site during this project period: a single particle
mass spectrometer and an in situ VOC instrument. The single particle mass spectrometer
has been deployed since the middle of September and has collected more than 150 days
of data. The VOC instrument was only deployed during the intensive sampling period.
Several instruments experienced operational issues during this project period. The
overall data recovery rate for the project has been high.
The average daily concentration of PM2.5 was 17.4 [g/m3 during this period. The data
indicate a strong seasonal variation in both PM2.5 levels and composition. PM2.5 levels
are higher in the summer, with an average level of 21.3 [g/m3 during July, August and
September. Levels were lower in the fall and winter, with an average level of 12.6 [g/m3
during October, November and December. The major chemical components of the PM2.5
are sulfate and organic material throughout the year, with nitrate making a significant
contribution during the winter. For the period of July through November, the mass
measured with the FRM was greater than the sum of chemical components. We are
currently investigating whether or not this "extra mass" measured by the FRM is water
retained on the Teflon filters.
Comparison of data collected at satellite sites and the central site indicate that there
was relatively little spatial variation in the PM2.5 levels around Pittsburgh during July
2001. This suggests that PM2.5 was determined mostly by the same sources, namely
regional sources upwind of the study area. The total particle number concentration and
ultrafine particle levels at the central monitoring site appear dominated by nucleation
bursts. Evidence of nucleation bursts can be seen on approximately 50% of the days.
The frequency and intensity of these nucleation bursts make them the single biggest factor
in determining the number concentration of particles at the sampling site in Schenley
Park, followed by traffic intensity, other local combustion, and regional transport as
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Robinson, Allen L.; Pandis, Spyros N. & Davidson, Cliff I. ATMOSPHERIC AEROSOL SOURCE-RECEPTOR RELATIONSHIPS: THE ROLE OF COAL-FIRED POWER PLANTS, report, March 1, 2002; Pittsburgh, Pennsylvania. (digital.library.unt.edu/ark:/67531/metadc743019/m1/3/: accessed November 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.