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Acidic sulfate aerosols: characterization and exposure.

Exposures to acidic aerosol in the atmosphere are calculated from data reported in the scientific literature. The majority of date was not derived from studies necessarily designed to examine human exposures. Most of the studies were designed to investigate the characteristics of the atmosphere. How...

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Detalles Bibliográficos
Autores principales: Lioy, P J, Waldman, J M
Formato: Texto
Lenguaje:English
Publicado: 1989
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1567580/
https://www.ncbi.nlm.nih.gov/pubmed/2651103
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author Lioy, P J
Waldman, J M
author_facet Lioy, P J
Waldman, J M
author_sort Lioy, P J
collection PubMed
description Exposures to acidic aerosol in the atmosphere are calculated from data reported in the scientific literature. The majority of date was not derived from studies necessarily designed to examine human exposures. Most of the studies were designed to investigate the characteristics of the atmosphere. However, the measurements were useful in defining two potential exposure situations: regional stagnation and transport conditions and local plume impacts. Levels of acidic aerosol in excess of 20 to 40 micrograms/m3 (as H2SO4) have been observed for time durations ranging from 1 to 12 hr. These were associated with high, but not necessarily the highest, atmospheric SO4(2)- levels. Exposures of 100 to 900 micrograms/m3/hr were calculated for the acid events that were monitored. In contrast, earlier London studies indicated that apparent acidity in excess of 100 micrograms/m3 (as H2SO4) was present in the atmosphere, and exposures less than 2000 micrograms/m3/hr were possible. Our present knowledge about the frequency, magnitude, and duration of acidic sulfate aerosol events and episodes is insufficient. Efforts must be made to gather more data, but these should be done in such a way that evaluation of human exposure is the focus of the research. In addition, further data are required on the mechanisms of formation of H2SO4 and on what factors can be used to predict acidic sulfate episodes.
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spelling pubmed-15675802006-09-18 Acidic sulfate aerosols: characterization and exposure. Lioy, P J Waldman, J M Environ Health Perspect Research Article Exposures to acidic aerosol in the atmosphere are calculated from data reported in the scientific literature. The majority of date was not derived from studies necessarily designed to examine human exposures. Most of the studies were designed to investigate the characteristics of the atmosphere. However, the measurements were useful in defining two potential exposure situations: regional stagnation and transport conditions and local plume impacts. Levels of acidic aerosol in excess of 20 to 40 micrograms/m3 (as H2SO4) have been observed for time durations ranging from 1 to 12 hr. These were associated with high, but not necessarily the highest, atmospheric SO4(2)- levels. Exposures of 100 to 900 micrograms/m3/hr were calculated for the acid events that were monitored. In contrast, earlier London studies indicated that apparent acidity in excess of 100 micrograms/m3 (as H2SO4) was present in the atmosphere, and exposures less than 2000 micrograms/m3/hr were possible. Our present knowledge about the frequency, magnitude, and duration of acidic sulfate aerosol events and episodes is insufficient. Efforts must be made to gather more data, but these should be done in such a way that evaluation of human exposure is the focus of the research. In addition, further data are required on the mechanisms of formation of H2SO4 and on what factors can be used to predict acidic sulfate episodes. 1989-02 /pmc/articles/PMC1567580/ /pubmed/2651103 Text en
spellingShingle Research Article
Lioy, P J
Waldman, J M
Acidic sulfate aerosols: characterization and exposure.
title Acidic sulfate aerosols: characterization and exposure.
title_full Acidic sulfate aerosols: characterization and exposure.
title_fullStr Acidic sulfate aerosols: characterization and exposure.
title_full_unstemmed Acidic sulfate aerosols: characterization and exposure.
title_short Acidic sulfate aerosols: characterization and exposure.
title_sort acidic sulfate aerosols: characterization and exposure.
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1567580/
https://www.ncbi.nlm.nih.gov/pubmed/2651103
work_keys_str_mv AT lioypj acidicsulfateaerosolscharacterizationandexposure
AT waldmanjm acidicsulfateaerosolscharacterizationandexposure