ATMOSPHERIC AEROSOL SOURCE-RECEPTOR RELATIONSHIPS: THE ROLE OF COAL-FIRED POWER PLANTS Page: 4 of 12
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Executive Summary
This report describes the technical progress made on the Pittsburgh Air Quality Study
during the period of February through July of 2001. The major effort during this period
involved the set-up and initiation of the ambient monitoring campaign. The central
sampling station next to the Carnegie Mellon University in Scheleny Park was completed.
Baseline measurements began on June 1, 2001, and the first intensive sampling period
occurred between June 30, 2001 and August 3, 2001. Data were collected at both the
central site and a set of satellite sites surrounding Pittsburgh.
Preliminary examination of the data has been initiated. This report presents results of
PM-2.5 mass and chemical composition measured on a 24-hr basis for the July intensive
period. The average PM-2.5 concentration at the central monitoring site for the July
intensive was 23 [g/m3. The variation in PM-2.5 levels indicates that a wide range of
atmospheric conditions occurred during the month of July, and, therefore, the data will be
useful for evaluating the performance of air quality models over a range of conditions.
During July, the major chemical components of the PM-2.5 mass are sulfate and organic
material. Elemental carbon and nitrate only contribute a small part of the PM-2.5 mass
on a 24-hr average basis.
Comparing the measured PM-2.5 mass and the sum of the chemical components
indicates problems with the mass balance. The total measured mass tends to be larger
than the sum of the major chemical components at high PM levels, and smaller than the
sum of the components at low PM levels. There are many potential explanations for the
observed discrepancies; however, preliminary data suggests that water may be source of
the mass balance discrepancy at high PM levels.4
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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, September 1, 2001; Pittsburgh, Pennsylvania. (https://digital.library.unt.edu/ark:/67531/metadc742458/m1/4/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.