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Markov modeling of contaminant concentrations in indoor air.

Authors
Nicas-M
Source
Am Ind Hyg Assoc J 2000 Jul/Aug; 61(4):484-491
NIOSHTIC No.
20029856
Abstract
Most models for contaminant dispersion in indoor air are deterministic and do not account for the probabilistic nature of the pollutant concentration at a given room position and time. Such variability can be important when estimating concentrations involving small numbers of contaminant particles. This article describes the use of probabilistic models termed Markov chains to account for a portion of this variability. The deterministic and Markov models are related in that the former provide the expected concentration values. To explain this relationship, a single-zone (well-mixed room) scenario is described as a Markov chain. Subsequently, a two-zone room is cast as a Markov model, and the latter is applied to assessing a health care worker's risk of tuberculosis infection. Airborne particles carrying Mycobacterium tuberculosis bacilli are usually present in small numbers in a room occupied by an infectious tuberculosis patient. For a given scenario, the Markov model permits estimates of variability in exposure intensity and the resulting variability in infection risk.
Keywords
Infectious-diseases; Infection-control; Aerosol-particles; Aerosol-sampling; Disease-transmission; Disease-incidence; Disease-control; Risk-analysis; Risk-factors; Health-care-facilities; Health-care-personnel; Simulation-methods; Analytical-models; Infection-control; Air-contamination; Air-quality; Air-quality-monitoring; Air-sampling; Airborne-particles
Contact
Center for Occupational and Environmental Health, School of Public Health, University of California, Berkeley, CA 94720
CODEN
AIHAAP
Publication Date
20000701
Document Type
Journal Article
Funding Amount
161775
Funding Type
Grant
Fiscal Year
2000
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-K01-OH-000155
Issue of Publication
4
ISSN
0002-8894
Priority Area
Research Tools and Approaches: Risk Assessment Methods
Source Name
American Industrial Hygiene Association Journal
State
CA
Performing Organization
University of California-Berkeley, School of Public Health, Center for Occupational and Environmental Health, Berkeley, CA 94720
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