Comparison of concurrent direct reading and active air sampling data for the same exposure category
| Date (separate days) | Predicted TWA from direct reading instrument (μg Hg/m3air) |
Active personal sampler (μg Hg/m3 air) |
| April 1988 | 9 | 44 |
| April 1988 | 29 | 30 |
| April 1988 | 33 | 45 |
| April 1988 | 45 | 57 |
| September 1988 | 53 | 223 |
| September 1988 | 61 | 165 |
| September 1988 | 97 | 140 |
| September 1988 | 97 | 234 |