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Risk from exposure [to asbestos] within buildings:There have been various attempts to estimate the risk from exposure within buildings and summaries of two of these are given below:- D.O.E. (U.K.)usually < 0.0005 f ml-1 (> background, regulated fibres). 40 hrs/week for 20 years = attributable Life-time risk of death of ~ 1 = 100,000. +Ontario Royal Commissionassume 0.001 f ml-1 , work exposure for 10 years = attributable risk of death risk 20:1,000,000.** about 1/50 of death risk of 10mile drive/working day for same time + about 1/100 of death risk for non-smokers from passive exposure to smoke ( ~ 1/10 cigarette/day) NB: Chrysotile - building exposure - all UK population- attributable risk 1 p.a. Therefore, provided the asbestos is well contained in structural elements such as tiles or cement, well sealed and left undisturbed (no drilling, sawing, or unscrupulous demolition), the risk of asbestos related disease should be negligibly small - arguably smaller than the risk of removing it.