Air concentration fibres/ml | Cumulative exposure fibresml/ years | Computed relative risk | Predicted exposed population needed for one extra lung cancer death (millions)* | Exposure |
Assuming b = 0.0006 (equation [1]) | ||||
0.5 | 0.008 | 1.0000049 | 3 | I |
0.25 | 0.004 | 1.0000025 | 6 | II |
0.1 | 0.002 | 1.0000010 | 14 | |
0.04 | 0.0003 | 1.0000004 | 36 | III |
0.001 | 0.00002 | 1.00000001 | 1450 | IV |
Assuming b = 0.01 (equation [1]) | ||||
0.5 | 0.008 | 1.000082 | 0.17 | I |
0.25 | 0.004 | 1.000041 | 0.35 | II |
0.1 | 0.002 | 1.000016 | 0.87 | |
0.04 | 0.0003 | 1.000007 | 2 | III |
0.001 | 0.00002 | 1.0000002 | 86 | IV |
United Kingdom industrial control limit.33 Average exposure level if the United Kingdom industrial control limit is enforced.33 Upper limit of asbestos concentration indoors in a building with friable sprayed asbestos.25 Lower limit of asbestos concentration indoors in a building with friable sprayed asbestos, and a median level for residential air in a large city or a road crossing with heavy traffic.25 *See method above under chrysotile and lung cancer risk model.