PM2.5 Design Values for 2008-2010 in NC Counties

There are no counties with a 3-year average of the annual mean PM_2.5 for each year above the annual standard and no counties with a 3-year average of the 98^th percentile above the daily standard.

Figure 1 Annual Design Values (Mean) (click for larger image)

Figure 2 Daily Design Values (98^th %) (click for larger image)

Table 1. The following table shows 28 counties with a 3-year average of the annual mean PM_2.5 for each year below the established standard and 3-year averages for the 98^th percentile of PM_2.5 concentrations. The first column lists the county; the second lists the average value for that county (rounded to the specifications of the annual standard); the third lists the average value for that county (rounded to the specifications of the daily standard). In Counties with more than one PM_2.5 monitoring site, the value reported is the highest 3-year average among the inclusive sites.

County	Average value	Average 98^th Percentile
Alamance	10.9 µg/m³	22 µg/m3
Buncombe	9.2 µg/m³	20 µg/m3
Caswell	9.9 µg/m³	19 µg/m3
Catawba	11.4 µg/m³	23 µg/m3
Chatham	9.3 µg/m³	20 µg/m3
Cumberland	11.1 µg/m³	23 µg/m3
Davidson	12.1 µg/m³	23 µg/m3
Duplin	9.3 µg/m³	19 µg/m3
Durham	10.4 µg/m³	21 µg/m3
Edgecombe	9.8 µg/m³	21 µg/m3
Forsyth	10.9 µg/m³	23 µg/m3
Gaston	11.1 µg/m³	22 µg/m3
Guilford	10.8 µg/m³	22 µg/m3
Haywood	10.6 µg/m³	23 µg/m3
Jackson	9.6 µg/m³	20 µg/m3
Lenoir	9.4 µg/m³	20 µg/m3
Martin	9.2 µg/m³	21 µg/m3
McDowell	10.3 µg/m³	21 µg/m3
Mecklenburg	11.9 µg/m³	24 µg/m3
Mitchell	9.6 µg/m³	19 µg/m3
Montgomery	9.9 µg/m³	21 µg/m3
Pitt	10.1 µg/m³	21 µg/m3
Robeson	10.4 µg/m³	22 µg/m3
Rowan	11.4 µg/m³	22 µg/m3
Swain	9.9 µg/m³	20 µg/m3
Wake	10.2 µg/m³	22 µg/m3
Watauga	8.6 µg/m³	17 µg/m3
Wayne	10.8 µg/m³	22 µg/m3