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PM10-2.5 Distribution Statistics for 2010


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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 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