Table 3.
Mann–Whitney rank sum tests for the 25th, 50th, and 75th percentiles of 24-hr average PM2.5 concentration (µg m−3) for the collocated Partisol FRM, SHARP, and TEOM40 measurements at the AMS 6 site for the period of June 2011 to May 2013.
| Season | Group | N (size) | 25% | 50% | 75% |
|---|---|---|---|---|---|
| Warm | FRM | 31 | 2.3 | 3.6 | 6.7 |
| SHARP | 31 | 3.3 | 4.3 | 5.6 | |
| TEOM40 | 31 | 1.3 | 2.5 | 4.6 | |
| p = 0.33 between SHARP and FRM; p = 0.08 between TEOM40 and FRM; p < 0.01 between SHARP and TEOM40. | |||||
| Cold | FRM | 56 | 2.9 | 4.5 | 6.2 |
| SHARP | 56 | 3.5 | 4.3 | 6.1 | |
| TEOM40 | 56 | 1.5 | 2.4 | 3.7 | |
| p = 0.82 between SHARP and FRM; p < 0.01 between TEOM40 and FRM; p < 0.01 between SHARP and TEOM40. | |||||
| All | FRM | 87 | 2.7 | 4.4 | 6.2 |
| SHARP | 87 | 3.3 | 4.3 | 5.8 | |
| TEOM40 | 87 | 1.5 | 2.4 | 3.8 | |
| p = 0.44 between SHARP and FRM; p < 0.01 between TEOM40 and FRM; p < 0.01 between SHARP and TEOM40. | |||||