Table 5 Statistical analysis of all representative workday samples for airborne fiber concentrations at nine different U. S. Steel Departments (1972–2006).
From: Occupational exposure to asbestos in the steel industry (1972–2006)
Fiber Concentration by PCM (fibers/cc) | |||||||
|---|---|---|---|---|---|---|---|
Department | Time Period | n | Mean | SD | 95th Percentile | Max | PEL |
Blast Furnace | 1972–1975 | 1 | 2.92 | – | – | 2.92 | 5 |
1976–1985 | 6 | 0.12 | 0.08 | – | 0.23 | 2 | |
Boiler House | 1976–1985 | 12 | 0.06 | 0.10 | – | 0.36 | 2 |
1986–1993 | 37 | 0.01 | 0.02 | 0.08 | 0.10 | 0.2 | |
1994–2006 | 31 | 0.02 | 0.03 | 0.09 | 0.17 | 0.1 | |
Central Maintenance | 1972–1975 | 15 | 0.41 | 0.29 | – | 1.10 | 5 |
1976–1985 | 6 | 0.05 | 0.04 | – | 0.09 | 2 | |
1986–1993 | 10 | 0.01 | 0.01 | – | 0.03 | 0.2 | |
1994–2006 | 1 | 0.01 | – | – | 0.01 | 0.1 | |
Coke | 1976–1985 | 6 | 0.07 | 0.05 | – | 0.17 | 2 |
1986–1993 | 46 | 0.03 | 0.04 | 0.13 | 0.16 | 0.2 | |
Finishing | 1972–1975 | 2 | 0.51 | – | – | 0.87 | 5 |
1976–1985 | 51 | 0.16 | 0.35 | 1.20 | 1.28 | 2 | |
1986–1993 | 42 | 0.02 | 0.04 | 0.13 | 0.13 | 0.2 | |
Foundry | 1972–1975 | 10 | 0.07 | 0.03 | – | 0.13 | 5 |
Masonry | 1972–1975 | 5 | 0.23 | 0.42 | – | 0.98 | 5 |
1976–1985 | 6 | 0.07 | 0.11 | – | 0.22 | 2 | |
Melt Shop | 1972–1975 | 12 | 3.10 | 3.08 | – | 10.00 | 5 |
1976–1985 | 12 | 0.25 | 0.45 | – | 1.36 | 2 | |
1986–1993 | 5 | 0.01 | 0.01 | – | 0.02 | 0.2 | |
1994–2006 | 3 | 0.05 | – | – | 0.06 | 0.1 | |
Research Labs | 1976–1985 | 6 | 0.004 | 0.01 | – | 0.02 | 2 |
1986–1993 | 12 | 0.01 | 0.004 | – | 0.01 | 0.2 | |
Total | 337 | ||||||
