RE: SPAM-LOW: Re: microbial testing of automobile a/c air

[Guest guest]

Does someone want ot track down this article, read it, and give the team a report?

Vinh

-----Original Message-----From: iequality [mailto:iequality ]On Behalf Of Carl E. GrimesSent: Friday, January 27, 2006 10:49 PMTo: iequality Subject: SPAM-LOW: Re: microbial testing of automobile a/c airRe: My question about comparison of outdoor mold levels to indoor levels and the need to include transfer rates. I found tow studies:1. FACTORS AFFECTING THE CONCENTRATION OF OUTDOORPARTICLES INDOORSfrom Lawrence Berkely Lab at lbl.gov. Study LBNL-49570.pdfMcKone, Thatcher, et alABSTRACTAccurate characterization of particle concentrations indoors is critical to exposure assessments. It is estimated that indoor particle concentrations depend strongly on outdoor concentrations. For health scientists, knowledge of the factors that control the relationship of indoor particle concentrations to outdoor levels is particularly important. In this paper, we identify and evaluate sources of data for those factors that affect the transport to andconcentration of outdoor particles indoors. [snip]DISCUSSIONThe concentration of outdoor particles in the indoor environment is a balance between several competing processes: particle entry, particle removal, and particle re-emission. [snip]CONCLUSION AND IMPLICATIONSOur review and evaluation affirms that understanding the processes affecting the concentration of outdoor particle indoors is essential for improving assessments of human exposure to particles of outdoor origin. This is particularly important for assessors who need to consider the spatial and temporal variation of indoor exposures to outdoor particles. Based on a detailed review and evaluation of data available and needed to link indoor concentration of particles to outdoor concentrations, we have determined that the most critical missing information includes the following: -measured particle penetration factors, -measured particle deposition rates in commercial and institutional buildings, -infiltration rates in commercial buildings, -the types of filters used in all buildings (except large offices), -window opening behaviors, and -rates of indoor resuspension of particles transferred indoors from outdoors. [snip]2. Also, EETD Newsletter, Summer 2003, pg. 1 Understanding the Indoor Concentrations of Outdoor Aerosols in ResidencesCONCLUSION: ...an exposure assessment based on total particle mass measured outdoors may not accurately represent actual human exposures to indoor particles of outdoor origin and may obscure the causal relationships involved. http://eetd.lbl.gov/newsletter/nl14/ResidenceAerosols.htmlIf these are to believed, then how can we rely on comparisons of indoor mold to outdoor mold without adjusting for transfer factors?Carl GrimesHealthy Habitats LLC