PM2.5 Design Values for 2005-2007 in NC Counties

There are two counties with a 3-year average of the annual mean PM2.5 above the annual standard, but no counties with a 3-year average of the 98thpercentile 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 29 counties with a 3-year average of the annual mean PM2.5 for each year and 31 counties with 3-year averages for the 98th percentile of PM2.5 concentrations below the established standards 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 13.8 µg/m3 32 µg/m3
Buncombe 12.6 µg/m3 30 µg/m3
Caswell 13.1 µg/m3 30 µg/m3
Catawba (see Table 2) 34 µg/m3
Chatham 12.0 µg/m3 27 µg/m3
Cumberland 13.6 µg/m3 30 µg/m3
Davidson (see Table 2) 31 µg/m3
Duplin 10.9 µg/m3 28 µg/m3
Durham 13.4 µg/m3 30 µg/m3
Edgecombe 12.4 µg/m3 27 µg/m3
Forsyth 14.1 µg/m3 32 µg/m3
Gaston 14.1 µg/m3 31 µg/m3
Guilford 13.9 µg/m3 30 µg/m3
Haywood 13.0 µg/m3 28 µg/m3
Jackson 12.4 µg/m3 27 µg/m3
Lenoir 10.9 µg/m3 25 µg/m3
Martin 10.6 µg/m3 23 µg/m3
McDowell 14.3 µg/m3 32 µg/m3
Mecklenburg 14.8 µg/m3 32 µg/m3
Mitchell 12.7 µg/m3 32 µg/m3
Montgomery 12.2 µg/m3 29 µg/m3
New Hanover 9.7 µg/m3 25 µg/m3
Onslow 10.5 µg/m3 25 µg/m3
Orange 12.9 µg/m3 29 µg/m3
Pitt 11.3 µg/m3 25 µg/m3
Robeson 12.8 µg/m3 30 µg/m3
Rowan 14.0 µg/m3 30 µg/m3
Swain 12.8 µg/m3 28 µg/m3
Wake 13.5 µg/m3 32 µg/m3
Watauga 11.9 µg/m3 30 µg/m3
Wayne 12.6 µg/m3 30 µg/m3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Table 2. The following table shows 2 counties with a 3-year average of the annual mean PM2.5 for each year above the established standard. The first column lists the county; the second lists the average value for that county (rounded to the specifications of the standard).

County Average value
Catawba 15.2 µg/m3
Davidson 15.1 µg/m3