for >1 is enough for "ascertainment" of asbestosis (i.e. >5.0 fibre/mL-year). Estimates of cumulative asbestos exposures required for induction of asbestosis have diminished during the years. The threshold cumulative dose of asbestos necessary for clinical manifestations of asbestosis 20-200 fibre/mL-year with a few cases of 2-20 US Department RMA ID: Summary 28 sites - 3 groups who sites that Not reported Not reported Report. Author’s of Health and 067997 Report. experienced the most exfoliated conclusion: Fibre levels Services, Exposure to significant exposure to Vermiculite from inside the exfoliation ATSDR & asbestos former Libby: facilities ranged from Disease employees at below detection levels Registry Vermiculite exfoliation facilities, fibre/mL. Before Division of From Libby, household contacts of 1980, measured fibre Health Montana, at 28 these former levels ranged from 1-10 Assessment & Processing employees, and some fibre/mL, which is above Consultation Sites in the community members the current acceptable (2008) United States level of 0.1 fibre/mL for occupational exposure to asbestos. Libby indicated airborne fibre levels were as high as 245 fibre/mL in an unloading area. sampling results indicated airborne fibre
for >1 is enough for "ascertainment" of asbestosis (i.e. >5.0 fibre/mL-year). Estimates of cumulative asbestos exposures required for induction of asbestosis have diminished during the years. The threshold cumulative dose of asbestos necessary for clinical manifestations of asbestosis 20-200 fibre/mL-year with a few cases of 2-20 US Department of Health and Services, ATSDR & Disease Registry Division of Health Assessment & Consultation (2008) RMA ID: 067997 Summary Report. Exposure to Vermiculite From Libby, Montana, at 28 Processing Sites in the United States 28 sites - 3 groups who experienced the most significant exposure to asbestos former employees at exfoliation facilities, household contacts of these former employees, and some community members sites that exfoliated Vermiculite from Libby: Not reported Not reported Report. Author’s conclusion: Fibre levels inside the exfoliation facilities ranged from below detection levels fibre/mL. Before 1980, measured fibre levels ranged from 1-10 fibre/mL, which is above the current acceptable level of 0.1 fibre/mL for occupational exposure to asbestos. Libby indicated airborne fibre levels were as high as 245 fibre/mL in an unloading area. sampling results indicated airborne fibre
asb_reasons10.12.2015.docx