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.
 

A map of North Carolina PM2.5 design values from 2005 to 2007.

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

A map of North Carolina PM2.5 "daily standard" design values from 2005 to 2007.

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.

CountyAverage valueAverage 98th Percentile
Alamance13.8 µg/m332 µg/m3
Buncombe12.6 µg/m330 µg/m3
Caswell13.1 µg/m330 µg/m3
Catawba(see Table 2)34 µg/m3
Chatham12.0 µg/m327 µg/m3
Cumberland13.6 µg/m330 µg/m3
Davidson(see Table 2)31 µg/m3
Duplin10.9 µg/m328 µg/m3
Durham13.4 µg/m330 µg/m3
Edgecombe12.4 µg/m327 µg/m3
Forsyth14.1 µg/m332 µg/m3
Gaston14.1 µg/m331 µg/m3
Guilford13.9 µg/m330 µg/m3
Haywood13.0 µg/m328 µg/m3
Jackson12.4 µg/m327 µg/m3
Lenoir10.9 µg/m325 µg/m3
Martin10.6 µg/m323 µg/m3
McDowell14.3 µg/m332 µg/m3
Mecklenburg14.8 µg/m332 µg/m3
Mitchell12.7 µg/m332 µg/m3
Montgomery12.2 µg/m329 µg/m3
New Hanover9.7 µg/m325 µg/m3
Onslow10.5 µg/m325 µg/m3
Orange12.9 µg/m329 µg/m3
Pitt11.3 µg/m325 µg/m3
Robeson12.8 µg/m330 µg/m3
Rowan14.0 µg/m330 µg/m3
Swain12.8 µg/m328 µg/m3
Wake13.5 µg/m332 µg/m3
Watauga11.9 µg/m330 µg/m3
Wayne12.6 µg/m330 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).

CountyAverage value
Catawba15.2 µg/m3
Davidson15.1 µg/m3