PM2.5 Design Values for 2002-2004 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 2002 to 2004.

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

A map of North Carolina PM2.5 "Daily Standard" design values from 20002 to 2004.

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 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 98th percentile 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.

CountyAverage valueAverage 98th Percentile
Alamance13.7 µg/m330 µg/m3
Buncombe12.9 µg/m329 µg/m3
Cabarrus14.5 µg/m332 µg/m3
Caswell13.1 µg/m330 µg/m3
Catawba(see Table 2)34 µg/m3
Chatham12.0 µg/m326 µg/m3
Cumberland13.8 µg/m332 µg/m3
Davidson(see Table 2)33 µg/m3
Duplin11.8 µg/m327 µg/m3
Durham13.6 µg/m333 µg/m3
Edgecombe11.6 µg/m3n/a
Forsyth14.3 µg/m333 µg/m3
Gaston14.1 µg/m330 µg/m3
Guilford13.7 µg/m331 µg/m3
Haywood12.9 µg/m327 µg/m3
Jackson11.9 µg/m326 µg/m3
Lenoir11.2 µg/m326 µg/m3
McDowell13.9 µg/m329 µg/m3
Martin11.3 µg/m3n/a
Mecklenburg14.9 µg/m332 µg/m3
Mitchell12.8 µg/m328 µg/m3
Montgomery12.1 µg/m326 µg/m3
New Hanover *9.9 µg/m323 µg/m3
Onslow11.2 µg/m324 µg/m3
Orange13.0 µg/m328 µg/m3
Pitt12.1 µg/m328 µg/m3
Robeson12.6 µg/m328 µg/m3
Swain12.4 µg/m326 µg/m3
Wake13.5 µg/m332 µg/m3
Watauga11.6 µg/m330 µg/m3
Wayne13.2 µg/m328 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.

Note:

  • Additional counties may be involved in emission reduction strategies
  • Nonattainment designations may not follow county boundaries
CountyAverage value
Catawba15.1 µg/m3
Davidson15.4 µg/m3