Table 2.
Geometric means, GSDs, and numbers of measurements for underground area air measurements of selected DE components, by mining facility
| Mining facility | Type | REC (μg m−3) | ROC (μg m−3) | NO (ppm) | NO2 (ppm) | CO (ppm) | CO2 (ppm) | SCD (mg m−3) | TD (mg m−3) |
| GM (GSD), n | GM (GSD), n | GM (GSD), n | GM (GSD), n | GM (GSD), n | GM (GSD), n | GM (GSD), n | GM (GSD), n | ||
| A | Limestone | 459 (2.12), 26 | 97 (1.83), 26 | 1.06 (5.19), 26 | 0.92 (4.52), 26 | 2.70 (4.38), 23 | 1031 (1.30), 26 | 0.16 (11.03), 22 | 2.07 (2.71), 26 |
| B | Potash | 105 (3.77), 24 | 83 (1.48), 24 | 1.48 (2.96), 24 | 0.26 (1.71), 24 | 1.83 (2.93), 23 | 1301 (1.48), 17 | 0.03 (8.79), 24 | 1.34 (4.91), 23 |
| D | Potash | 55 (3.51), 19 | 62 (2.03), 20 | 1.15 (3.85), 20 | 0.49 (2.02), 20 | 1.72 (2.34), 20 | 571 (1.26), 14 | 0.05 (4.81), 20 | 0.99 (1.82), 20 |
| E | Salt | 76 (3.22), 26 | 100 (1.95), 26 | 1.61 (2.90), 26 | 0.59 (2.31), 26 | 2.71 (1.73), 26 | 733 (1.34), 26 | 0.08 (5.28), 26 | 1.01 (3.15), 26 |
| G | Trona | 30 (2.49), 26 | 54 (1.28), 26 | 0.20 (3.23), 26 | 0.10 (1.05), 26 | 0.44 (2.12), 23 | 534 (1.08), 24 | 0.04 (1.97), 23 | 2.92 (4.21), 26 |
| H | Trona | 48 (5.82), 26 | 107 (1.63), 26 | 0.57 (4.98), 27 | 0.08 (1.54), 27 | 0.96 (3.81), 26 | 653 (1.26), 27 | 0.04 (9.19), 21 | 1.38 (4.24), 27 |
| I | Trona | 21 (3.65), 29 | 58 (2.07), 29 | 0.26 (4.37), 30 | 0.10 (1.44), 30 | 2.29 (3.13), 30 | 647 (1.29), 30 | 0.04 (1.94), 28 | 0.98 (4.77), 30 |
GM = geometric mean; n = number of measurements; REC = Respirable elemental carbon; ROC = Respirable organic carbon; NO = Nitric oxide; NO2 = Nitrogen dioxide; CO = Carbon monoxide; CO2 = Carbon dioxide; SCD = Submicrometer combustible dust; TD = Total dust.