Temporal and spatial characteristics of particle mass in metropolitan Philadelphia
Conference
·
OSTI ID:197436
- Harvard Univ., Boston, MA (United States). School of Public Health
- Environmental Protection Agency, Research Triangle Park, NC (United States). Atmospheric Research and Exposure Assessment Lab.
Particle mass concentrations (PM{sub 2.5} and PM{sub 10}) were measured daily or every other day at seven residentially oriented sites in Philadelphia, PA during the summers of 1992 and 1993. Samples were collected for 24-h periods using 10 L-min{sup {minus}1} Harvard Impacts for mass. Coarse mass concentrations (2.5 < d{sub a} < 10 {micro}m) were determined by subtraction of PM{sub 2.5} from PM{sub 10}. To allow improved temporal characterization during periods of elevated particle mass concentration, continuous or semi-continuous methods for mass, sulfate, and black carbon were also used at one site for the first summer. Concentrations of PM{sub 10} and PM{sub 2.5} were reasonably uniform across the urban area, reflecting the regional nature of summertime transported secondary aerosols typical of summer months in the northeast US. Temporal variation in 24 h concentrations of PM{sub 2.5} and coarse particle mass are compared and contrasted for a 12 week period at the two sites. Fine mass is shown to dominate the daily and short term (6 to 12 h) temporal variation of PM{sub 10} concentrations. The relative contribution of elemental carbon and sulfate to the total fine particle mass concentration is contrasted for short term periods of high fine mass concentrations relative to similar periods of non-episodic concentrations, as well as for the 24 h duration samples.
- OSTI ID:
- 197436
- Report Number(s):
- CONF-9405167--
- Country of Publication:
- United States
- Language:
- English
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