PM2.5 Design Values for 2004-2006 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 28 counties with a 3-year average of the annual mean PM2.5 for each year below the established annual standard and 30 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. Averages for the counties marked with an asterisk are "unofficial estimates", because a sample size requirement ("data completeness") was not satisfied.

County Average value Average 98th Percentile
Alamance 14.0 µg/m3 31 µg/m3
Buncombe 12.6 µg/m3 30 µg/m3
Caswell 13.4 µg/m3 29 µg/m3
Catawba (see Table 2) 35 µg/m3
Chatham 12.2 µg/m3 27 µg/m3
Cumberland 13.9 µg/m3 31 µg/m3
Davidson (see Table 2) 31 µg/m3
Duplin 11.6 µg/m3 30 µg/m3
Durham 13.7 µg/m3 31 µg/m3
Edgecombe 12.4 µg/m3 27 µg/m3
Forsyth 14.4 µg/m3 32 µg/m3
Gaston 14.4 µg/m3 31 µg/m3
Guilford * 14.0 µg/m3 31 µg/m3
Haywood 13.0 µg/m3 28 µg/m3
Jackson 12.0 µg/m3 25 µg/m3
Lenoir 11.2 µg/m3 25 µg/m3
Martin 11.10 µg/m3 26 µg/m3
McDowell 14.4 µg/m3 32 µg/m3
Mecklenburg 14.8 µg/m3 32 µg/m3
Mitchell 12.7 µg/m3 31 µg/m3
Montgomery 12.4 µg/m3 29 µg/m3
New Hanover * 10.2 µg/m3 25 µg/m3
Onslow 11.2 µg/m3 25 µg/m3
Orange 13.2 µg/m3 30 µg/m3
Pitt 11.6 µg/m3 26 µg/m3
Robeson 12.8 µg/m3 30 µg/m3
Rowan * 14.2 µg/m3 n/a
Swain 12.4 µg/m3 26 µg/m3
Wake 13.6 µg/m3 31 µg/m3
Watauga 11.9 µg/m3 30 µg/m3
Wayne 13.1 µg/m3 30 µg/m3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

County Average value
Catawba 15.4 µg/m3
Davidson 15.2 µg/m3