PM2.5 Design Values for 2006-2008 in NC Counties

There are no counties with a 3-year average of the annual mean PM2.5 for each year above the annual standard and no counties with a 3-year average of the 98th percentile above the daily standard.

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

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

 

Table 1. The following table shows 28 counties with a 3-year average of the annual mean PM2.5 for each year below the established annual standard and a 3-year average for the 98th percentile of PM2.5 concentrations below the established daily standard. 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 PM2.5 monitoring site, the value reported is the highest 3-year average among the inclusive sites.

County Average value Average 98th Percentile
Alamance 12.9 µg/m3 28 µg/m3
Buncombe 11.2 µg/m3 27 µg/m3
Caswell 12.4 µg/m3 27 µg/m3
Catawba 14.2 µg/m3 30 µg/m3
Chatham 11.6 µg/m3 26 µg/m3
Cumberland 13.0 µg/m3 28 µg/m3
Davidson 14.5 µg/m3 29 µg/m3
Duplin 10.5 µg/m3 24 µg/m3
Durham 11.6 µg/m3 27 µg/m3
Edgecombe 11.8 µg/m3 25 µg/m3
Forsyth 13.3 µg/m3 29 µg/m3
Gaston 13.4 µg/m3 27 µg/m3
Guilford 12.8 µg/m3 29 µg/m3
Haywood 12.4 µg/m3 27 µg/m3
Jackson 11.3 µg/m3 26 µg/m3
Lenoir 10.4 µg/m3 23 µg/m3
Martin 10.4 µg/m3 23 µg/m3
McDowell 13.0 µg/m3 29 µg/m3
Mecklenburg 13.7 µg/m3 29 µg/m3
Mitchell 11.6 µg/m3 27 µg/m3
Montgomery 11.7 µg/m3 26 µg/m3
Pitt 11.4 µg/m3 24 µg/m3
Robeson 12.2 µg/m3 27 µg/m3
Rowan 13.6 µg/m3 28 µg/m3
Swain 11.9 µg/m3 27 µg/m3
Wake 12.5 µg/m3 27 µg/m3
Watauga 10.7 µg/m3 25 µg/m3
Wayne 12.2 µg/m3 29 µg/m3