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11. Evaluation of the use of Diffusive air samplers for determining temporal and spatial variation of volatile organic compounds in the ambient air of urban communities

Author

Stock, Thomas H., Morandi, Maria T., Afshar, Masoud, and Chung, Kuenja C.

Subjects
Volatile organic compounds -- Environmental aspects -- Methods, Health risk assessment -- Methods -- Environmental aspects, Air pollution -- Evaluation -- Methods -- Environmental aspects, Metropolitan areas -- Environmental aspects -- Methods, Environmental services industry, Environmental issues, Science and technology
Abstract

ABSTRACT The Houston-Galveston metropolitan area has a relatively high density of point and mobile sources of air toxics, and determining and understanding the relationship between emissions and ambient air concentrations [...]

Published
2008

15. Evaluation of a passive sampler for volatile organic compounds at ppb concentrations, varying temperatures, and humidities with 24-h exposures: 2. sampler performance

Author

Chung, Chih-Wen, Morandi, Maria T., Stock, Thomas H., and Afshar, Masoud

Subjects
Volatile organic compounds -- Research, Atmospheric research -- Environmental aspects, Air sampling apparatus -- Research, Environmental issues, Science and technology
Abstract

The performance of an air sampler is evaluated using controlled test atmospheres. The sampler monitors ppb (parts per billion) concentrations in volatile organic compounds in nonoccupational community environments.

Published
1999

16. Evaluation of a passive sampler for volatile organic compounds at ppb concentrations, varying temperatures, and humidities with 24-h exposures: 1. description and characterization of exposure chamber system

Author

Chung, Chih-Wen, Morandi, Maria T, Stock, Thomas H., and Afshar, Masoud

Subjects
Volatile organic compounds -- Research, Air sampling apparatus -- Usage, Environmental issues, Science and technology
Abstract

A dynamic exposure test system, that measures low-level concentrations of volatile organic compounds over a spectrum of environmental conditions, is described.

Published
1999

27. Feasibility of using low-cost portable particle monitors for measurement of fine and coarse particulate matter in urban ambient air.

Author

Han, Inkyu, Symanski, Elaine, and Stock, Thomas H.

Subjects
PARTICULATE matter, CARDIOPULMONARY system, DISEASES, MORTALITY risk factors, REGRESSION analysis, HUMIDITY, PHYSIOLOGY
Abstract

Exposure to ambient particulate matter (PM) is known as a significant risk factor for mortality and morbidity due to cardiorespiratory causes. Owing to increased interest in assessing personal and community exposures to PM, we evaluated the feasibility of employing a low-cost portable direct-reading instrument for measurement of ambient air PM exposure. A Dylos DC 1700 PM sensor was collocated with a Grimm 11-R in an urban residential area of Houston Texas. The 1-min averages of particle number concentrations for sizes between 0.5 and 2.5 µm (small size) and sizes larger than 2.5 µm (large size) from a DC 1700 were compared with the 1-min averages of PM2.5(aerodynamic size less than 2.5 µm) and coarse PM (aerodynamic size between 2.5 and 10 µm) concentrations from a Grimm 11-R. We used a linear regression equation to convert DC 1700 number concentrations to mass concentrations, utilizing measurements from the Grimm 11-R. The estimated average DC 1700 PM2.5concentration (13.2 ± 13.7 µg/m3) was similar to the average measured Grimm 11-R PM2.5concentration (11.3 ± 15.1 µg/m3). The overall correlation (r2) for PM2.5between the DC 1700 and Grimm 11-R was 0.778. The estimated average coarse PM concentration from the DC 1700 (5.6 ± 12.1 µg/m3) was also similar to that measured with the Grimm 11-R (4.8 ± 16.5 µg/m3) with anr2of 0.481. The effects of relative humidity and particle size on the association between the DC 1700 and the Grimm 11-R results were also examined. The calculated PM mass concentrations from the DC 1700 were close to those measured with the Grimm 11-R when relative humidity was less than 60% for both PM2.5and coarse PM. Particle size distribution was more important for the association of coarse PM between the DC 1700 and Grimm 11-R than it was for PM2.5. Implications: The performance of a low-cost particulate matter (PM) sensor was evaluated in an urban residential area. Both PM2.5and coarse PM (PM10-2.5) mass concentrations were estimated using a DC1700 PM sensor. The calculated PM mass concentrations from the number concentrations of DC 1700 were close to those measured with the Grimm 11-R when relative humidity was less than 60% for both PM2.5and coarse PM. Particle size distribution was more important for the association of coarse PM between the DC 1700 and Grimm 11-R than it was for PM2.5. [ABSTRACT FROM AUTHOR]

Published
2017
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38. Relationship of Indoor, Outdoor and Personal Air (RIOPA) study: study design, methods and quality assurance/control results

Author

Weisel, Clifford P, primary, Zhang, Junfeng, additional, Turpin, Barbara J, additional, Morandi, Maria T, additional, Colome, Steven, additional, Stock, Thomas H, additional, Spektor, Dalia M, additional, Korn, Leo, additional, Winer, Arthur, additional, Alimokhtari, Shahnaz, additional, Kwon, Jaymin, additional, Mohan, Krishnan, additional, Harrington, Robert, additional, Giovanetti, Robert, additional, Cui, William, additional, Afshar, Masoud, additional, Maberti, Silvia, additional, and Shendell, Derek, additional

Published
2004
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44. Polycyclic Aromatic Hydrocarbons in the Indoor and Outdoor Air of Three Cities in the U.S.

Author

Naumova, Yelena Y., primary, Eisenreich, Steven J., additional, Turpin, Barbara J., additional, Weisel, Clifford P., additional, Morandi, Maria T., additional, Colome, Steven D., additional, Totten, Lisa A., additional, Stock, Thomas H., additional, Winer, Arthur M., additional, Alimokhtari, Shahnaz, additional, Kwon, Jaymin, additional, Shendell, Derek, additional, Jones, Jennifer, additional, Maberti, Silvia, additional, and Wall, Steven J., additional

Published
2002
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