PM2.5 Design Values for 2009-2011 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 30 counties with a 3-year average of the annual mean PM2.5 for each year below the established annual standard and 29 counties with 3-year averages 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 10.1 µg/m3 20 µg/m3
Buncombe 9.3 µg/m3 19 µg/m3
Caswell 8.9 µg/m3 18 µg/m3
Catawba 10.6 µg/m3 22 µg/m3
Chatham 8.5 µg/m3 19 µg/m3
Cumberland 10.3 µg/m3 22 µg/m3
Davidson 11.1 µg/m3 21 µg/m3
Duplin 8.9 µg/m3 19 µg/m3
Durham 9.7 µg/m3 19 µg/m3
Edgecombe 9.1 µg/m3 20 µg/m3
Forsyth 10.0 µg/m3 21 µg/m3
Gaston 10.4 µg/m3 23 µg/m3
Guilford 9.8 µg/m3 21 µg/m3
Haywood 10.0 µg/m3 22 µg/m3
Jackson 9.4 µg/m3 19 µg/m3
Johnston 9.2 µg/m3 19 µg/m3
Lenoir 9.3 µg/m3 22 µg/m3
Martin 8.7 µg/m3 23 µg/m3
McDowell 9.8 µg/m3 19 µg/m3
Mecklenburg 11.2 µg/m3 23 µg/m3
Mitchell 9.3 µg/m3 19 µg/m3
Montgomery 9.3 µg/m3 20 µg/m3
New Hanover 8.3 µg/m3  
Pitt 8.7 µg/m3 21 µg/m3
Robeson 10.0 µg/m3 22 µg/m3
Rowan 10.5 µg/m3 20 µg/m3
Swain 9.7 µg/m3 20 µg/m3
Wake 9.9 µg/m3 21 µg/m3
Watauga 8.3 µg/m3 18 µg/m3
Wayne 9.9 µg/m3 21 µg/m3