PM2.5 Design Values for 2007-2009 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 standard and 3-year averages for the 98th percentile of PM2.5 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 PM2.5 monitoring site, the value reported is the highest 3-year average among the inclusive sites.

County Average value Average 98th Percentile
Alamance 11.6 µg/m3 25 µg/m3
Buncombe 9.9 µg/m3 23 µg/m3
Caswell 10.7 µg/m3 23 µg/m3
Catawba 12.5 µg/m3 26 µg/m3
Chatham 10.2 µg/m3 22 µg/m3
Cumberland 11.7 µg/m3 24 µg/m3
Davidson 13.0 µg/m3 25 µg/m3
Duplin 9.6 µg/m3 21 µg/m3
Durham 10.8 µg/m3 22 µg/m3
Edgecombe 10.4 µg/m3 22 µg/m3
Forsyth 11.8 µg/m3 26 µg/m3
Gaston 12.0 µg/m3 24 µg/m3
Guilford 11.3 µg/m3 24 µg/m3
Haywood 10.6 µg/m3 23 µg/m3
Jackson 10.4 µg/m3 23 µg/m3
Lenoir 9.7 µg/m3 21 µg/m3
Martin 9.5 µg/m3 20 µg/m3
McDowell 11.5 µg/m3 24 µg/m3
Mecklenburg 12.6 µg/m3 26 µg/m3
Mitchell 10.8 µg/m3 23 µg/m3
Montgomery 10.6 µg/m3 22 µg/m3
Pitt 9.5 µg/m3 21 µg/m3
Robeson 11.2 µg/m3 24 µg/m3
Rowan 12.3 µg/m3 24 µg/m3
Swain 11.0 µg/m3 23 µg/m3
Wake 11.2 µg/m3 26 µg/m3
Watauga 9.6 µg/m3 21 µg/m3
Wayne 11.1 µg/m3 23 µg/m3