United States Department of Transportation
i
Effective control measures at high particulate pollution areas : analysis of data from the 2000 Phoenix Greenwood study
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2005-02-01
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TRIS Online Accession Number:1001278
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OCLC Number:60641266
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Edition:Final report; 04/2000 to 10/2004
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NTL Classification:NTL-ENERGY AND ENVIRONMENT-ENERGY AND ENVIRONMENT;NTL-ENERGY AND ENVIRONMENT-Air Quality;NTL-ENERGY AND ENVIRONMENT-Environment Impacts;NTL-REFERENCES AND DIRECTORIES-Statistics;
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Abstract:Annual average PM10 concentrations at the Greenwood monitoring station in western Phoenix have
exceeded EPA’s annual average air quality standard and are higher on average than values observed at the
West Phoenix monitor, which is located just 2.2 miles (3.5 km) to the northwest. While the West Phoenix
site is in a residential area away from any major thoroughfares, the Greenwood monitor is located just 330
feet (0.10 km) south of I-10 and within a half mile of the heavily traveled I-10/I-17 interchange. Data
collected during a field measurement program conducted in the spring of 2000 were analyzed to determine
the extent to which the nearby roadways influence PM10 levels at Greenwood. Analyses of the field data
showed evidence of stronger on-road mobile source impacts at Greenwood than at other nearby sites,
including West Phoenix. Dispersion modeling of mobile source emissions showed that on-road sources
contribute 3.6 to 4.2 times as much PM10 at Greenwood as at three nearby sites (West Phoenix, Autoyard,
and the Phoenix Supersite). These results were combined with monitoring data, a recent PM2.5 emissions
inventory for Phoenix, and results of a receptor modeling study at Supersite to estimate that the average onroad
mobile source PM10 impact at Greenwood is approximately 30 μg/m3,which represents 54% of the total
observed PM10. Local traffic sources within roughly a half-mile radius of Greenwood are estimated to
account for 66% of the total mobile source impact or approximately 20 μg/m3 or 36% of the total observed
PM10.
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