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PM10-2.5 Distribution Statistics for 2011


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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 116 0.0 3.70 5.50 7.52 12.37 5.83
Mecklenburg / Montclaire 1 114 0.0 3.25 5.65 8.10 19.02 6.48
Mecklenburg / Montclaire 2 57 0.0 3.00 5.70 7.80 21.32 6.76
Durham / Durham 110 0.9 3.93 5.60 6.88 11.84 5.74
Wake / Millbrook 115 0.0 3.64 5.29 6.73 11.61 5.34
Catawba / Hickory* 60 8.3 2.21 4.31 5.65 8.28 3.93
Forsyth / Winston-Salem* 381 2.8 2.90 5.28 7.35 11.61 5.31
Guilford / Greensboro* 52 30.8 -1.09 1.59 3.78 8.28 1.73
McDowell / Marion*# 57 10.5 2.03 3.91 5.70 8.33 3.68
Cumberland / Fayetteville* 61 4.9 1.88 3.03 4.52 15.89 3.62
Montgomery / Candor*# 58 6.9 2.29 3.59 4.80 7.75 3.41

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

# Coverage is from March, 2011 through February, 2012.

Last Modified: Thu August 22 16:43:01 2013