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Full shift average exposure to welding fume particulates measured in air samples collected among 44 randomly selected welders in 1987 in comparison with estimated exposures based upon the welding exposure matrix.
| Measurements in 1987 | Estimated exposures | |||
| n | Geometric mean mg/m3 | n | Geometric mean mg/m3 | |
| Mild steel manual metal arc (MMA) | 14 | 3.5 | 20 | 3.5 |
| Mild steel metal active gas (MAG) | 15 | 3.0 | 12 | 3.2 |
| Stainless steel, inert tungsten gas (TIG) | 15 | 1.1 | 15 | 1.3 |
