Factors affecting temporal variations in vapor intrusion-induced indoor air contaminant concentrations

Jonathan G.V. Ström, Yuanming Guo, Y. Yao, Eric M. Suuberg

Research output: Contribution to journalArticle

Abstract

Temporal variability in indoor air contaminant concentrations at vapor intrusion (VI) sites has been a concern for some time. We consider the source of the reported variability at VI sites located near Hill Air Force Base (AFB) in Utah, an EPA experimental house in Indiana, and Naval Air Station North Island in California. We focus in particular on how the indoor/outdoor pressure differences and air exchange rates affected indoor air contaminant concentrations at these sites. We investigate how these dynamics differ for a site that is characterized by a preferential pathway (like Hill AFB) and VI sites that are not influenced by such pathways, using three-dimensional fluid dynamics models and statistical analysis of the aforementioned sites. A preferential pathway can dramatically increase a VI site's sensitivity to build pressurization, provided there exist a medium allowing effective communication between a contaminant-delivering preferential pathway and the indoor air space, e.g. a permeable subslab space that may be provided by a gravel layer. Preferential pathways may also erroneously indicate the presence of indoor contaminant sources. At sites characterized by significant advective transport from the subslab to the indoor air space, much of the short-term variability in indoor air contaminant concentration can be explained by an impact of fluctuations in indoor/outdoor pressure differences. Meanwhile, air exchange rate variation drives most of the short-term variability at sites characterized by minor variations in advective transport.

Original languageEnglish (US)
Article number106196
JournalBuilding and Environment
Volume161
DOIs
StatePublished - Aug 15 2019

Fingerprint

indoor air
temporal variation
Vapors
air
Impurities
pollutant
Air
exchange rate
advection
air force
fluid dynamics
gravel
statistical analysis
communication
model analysis
Pressurization
fluctuation
Gravel
Fluid dynamics
Dynamic models

Keywords

  • Air exchange rate
  • Attenuation factor
  • Indoor/outdoor pressure difference
  • Preferential pathways
  • Temporal variability
  • Vapor intrusion

ASJC Scopus subject areas

  • Environmental Engineering
  • Civil and Structural Engineering
  • Geography, Planning and Development
  • Building and Construction

Cite this

Factors affecting temporal variations in vapor intrusion-induced indoor air contaminant concentrations. / Ström, Jonathan G.V.; Guo, Yuanming; Yao, Y.; Suuberg, Eric M.

In: Building and Environment, Vol. 161, 106196, 15.08.2019.

Research output: Contribution to journalArticle

@article{56888981a2cd45a59a27ed7857101c88,
title = "Factors affecting temporal variations in vapor intrusion-induced indoor air contaminant concentrations",
abstract = "Temporal variability in indoor air contaminant concentrations at vapor intrusion (VI) sites has been a concern for some time. We consider the source of the reported variability at VI sites located near Hill Air Force Base (AFB) in Utah, an EPA experimental house in Indiana, and Naval Air Station North Island in California. We focus in particular on how the indoor/outdoor pressure differences and air exchange rates affected indoor air contaminant concentrations at these sites. We investigate how these dynamics differ for a site that is characterized by a preferential pathway (like Hill AFB) and VI sites that are not influenced by such pathways, using three-dimensional fluid dynamics models and statistical analysis of the aforementioned sites. A preferential pathway can dramatically increase a VI site's sensitivity to build pressurization, provided there exist a medium allowing effective communication between a contaminant-delivering preferential pathway and the indoor air space, e.g. a permeable subslab space that may be provided by a gravel layer. Preferential pathways may also erroneously indicate the presence of indoor contaminant sources. At sites characterized by significant advective transport from the subslab to the indoor air space, much of the short-term variability in indoor air contaminant concentration can be explained by an impact of fluctuations in indoor/outdoor pressure differences. Meanwhile, air exchange rate variation drives most of the short-term variability at sites characterized by minor variations in advective transport.",
keywords = "Air exchange rate, Attenuation factor, Indoor/outdoor pressure difference, Preferential pathways, Temporal variability, Vapor intrusion",
author = "Str{\"o}m, {Jonathan G.V.} and Yuanming Guo and Y. Yao and Suuberg, {Eric M.}",
year = "2019",
month = "8",
day = "15",
doi = "10.1016/j.buildenv.2019.106196",
language = "English (US)",
volume = "161",
journal = "Building and Environment",
issn = "0360-1323",
publisher = "Elsevier BV",

}

TY - JOUR

T1 - Factors affecting temporal variations in vapor intrusion-induced indoor air contaminant concentrations

AU - Ström, Jonathan G.V.

AU - Guo, Yuanming

AU - Yao, Y.

AU - Suuberg, Eric M.

PY - 2019/8/15

Y1 - 2019/8/15

N2 - Temporal variability in indoor air contaminant concentrations at vapor intrusion (VI) sites has been a concern for some time. We consider the source of the reported variability at VI sites located near Hill Air Force Base (AFB) in Utah, an EPA experimental house in Indiana, and Naval Air Station North Island in California. We focus in particular on how the indoor/outdoor pressure differences and air exchange rates affected indoor air contaminant concentrations at these sites. We investigate how these dynamics differ for a site that is characterized by a preferential pathway (like Hill AFB) and VI sites that are not influenced by such pathways, using three-dimensional fluid dynamics models and statistical analysis of the aforementioned sites. A preferential pathway can dramatically increase a VI site's sensitivity to build pressurization, provided there exist a medium allowing effective communication between a contaminant-delivering preferential pathway and the indoor air space, e.g. a permeable subslab space that may be provided by a gravel layer. Preferential pathways may also erroneously indicate the presence of indoor contaminant sources. At sites characterized by significant advective transport from the subslab to the indoor air space, much of the short-term variability in indoor air contaminant concentration can be explained by an impact of fluctuations in indoor/outdoor pressure differences. Meanwhile, air exchange rate variation drives most of the short-term variability at sites characterized by minor variations in advective transport.

AB - Temporal variability in indoor air contaminant concentrations at vapor intrusion (VI) sites has been a concern for some time. We consider the source of the reported variability at VI sites located near Hill Air Force Base (AFB) in Utah, an EPA experimental house in Indiana, and Naval Air Station North Island in California. We focus in particular on how the indoor/outdoor pressure differences and air exchange rates affected indoor air contaminant concentrations at these sites. We investigate how these dynamics differ for a site that is characterized by a preferential pathway (like Hill AFB) and VI sites that are not influenced by such pathways, using three-dimensional fluid dynamics models and statistical analysis of the aforementioned sites. A preferential pathway can dramatically increase a VI site's sensitivity to build pressurization, provided there exist a medium allowing effective communication between a contaminant-delivering preferential pathway and the indoor air space, e.g. a permeable subslab space that may be provided by a gravel layer. Preferential pathways may also erroneously indicate the presence of indoor contaminant sources. At sites characterized by significant advective transport from the subslab to the indoor air space, much of the short-term variability in indoor air contaminant concentration can be explained by an impact of fluctuations in indoor/outdoor pressure differences. Meanwhile, air exchange rate variation drives most of the short-term variability at sites characterized by minor variations in advective transport.

KW - Air exchange rate

KW - Attenuation factor

KW - Indoor/outdoor pressure difference

KW - Preferential pathways

KW - Temporal variability

KW - Vapor intrusion

UR - http://www.scopus.com/inward/record.url?scp=85068440258&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85068440258&partnerID=8YFLogxK

U2 - 10.1016/j.buildenv.2019.106196

DO - 10.1016/j.buildenv.2019.106196

M3 - Article

VL - 161

JO - Building and Environment

JF - Building and Environment

SN - 0360-1323

M1 - 106196

ER -