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PM10-2.5 Distribution Statistics for 2009


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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 112 0.0 4.02 5.20 6.82 10.78 5.55
Mecklenburg / Montclaire 1 110 0.0 4.20 5.85 8.30 16.93 6.96
Mecklenburg / Montclaire 2 54 0.0 3.65 6.20 8.75 16.67 6.67
Wake / Millbrook 101 3.0 2.78 4.96 7.05 13.64 5.26
Catawba / Hickory* 58 5.2 3.13 6.03 9.36 16.11 6.59
Guilford / Greensboro* 54 11.1 1.69 4.47 5.62 11.32 3.89
Cumberland / Fayetteville* 53 15.1 1.82 3.76 7.04 10.52 4.08

* Computed using nonmatching PM10 and PM2.5 monitor methods.