PM10-2.5 Distribution Statistics for 2010
Table 1. The following table shows summary statistics for PM10-2.5. The first column identifies the county and site name; the second column shows the number of valid samples; the third column shows the percentage of these samples for which negative concentration values were computed; the 4th through 7th columns show indicated percentile statistics, 25%, 50%, 75% and 98%; and the 8th column shows the arithmetic mean value.
| County / Site | No. Obs. | % neg. | 25th % | 50th % | 75th % | 98th % | Arith. Mean |
|---|---|---|---|---|---|---|---|
| Mecklenburg / Garinger | 113 | 0.0 | 3.70 | 5.60 | 7.80 | 16.32 | 6.20 |
| Mecklenburg / Montclaire 1 | 105 | 0.0 | 3.50 | 5.80 | 9.10 | 23.66 | 7.28 |
| Mecklenburg / Montclaire 2 | 55 | 0.0 | 3.40 | 6.20 | 9.65 | 21.24 | 7.69 |
| Wake / Millbrook | 108 | 0.0 | 3.63 | 6.08 | 7.93 | 22.16 | 6.98 |
| Catawba / Hickory* | 54 | 16.7 | 1.35 | 4.12 | 9.30 | 14.92 | 5.01 |
| Guilford / Greensboro* | 56 | 26.8 | -0.12 | 3.55 | 8.55 | 14.70 | 5.01 |
| Cumberland / Fayetteville* | 57 | 15.8 | 1.07 | 3.70 | 7.67 | 20.84 | 4.63 |
* Computed using nonmatching PM10 and PM2.5 monitor methods.
Last Modified: Thu August 22 16:43:00 2013