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Concentration of RCS and RD during chipping tasks ‘with’ and ‘without’ the air curtain.
| Task/control used | n a | Sampling duration (hours) | Respirable silica conc. (µg/m3) | Respirable dust conc. (µg/m3) | % of samples with RCS conc. > OSHA PEL of 50 µg/m3 | ||
|---|---|---|---|---|---|---|---|
| GM (GSD) | Range | GM (GSD) | Range | ||||
| Chipping/without air curtain | 19 | 72–318 | 590 (2.02) | 152–1553 | 5980 (1.55) | 240–17,511 | 100% |
| Chipping/with air curtain | 12 | 54–168 | 440 (1.55) | 101–1343 | 330 (2.54) | 470–19,525 | 100% |
a n = Number of samples collected.
