PM2.5 Design Values for 2007-2009 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 28 counties with a 3-year average of the annual mean PM2.5 for each year below the established standard 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 | 11.6 µg/m3 | 25 µg/m3 |
| Buncombe | 9.9 µg/m3 | 23 µg/m3 |
| Caswell | 10.7 µg/m3 | 23 µg/m3 |
| Catawba | 12.5 µg/m3 | 26 µg/m3 |
| Chatham | 10.2 µg/m3 | 22 µg/m3 |
| Cumberland | 11.7 µg/m3 | 24 µg/m3 |
| Davidson | 13.0 µg/m3 | 25 µg/m3 |
| Duplin | 9.6 µg/m3 | 21 µg/m3 |
| Durham | 10.8 µg/m3 | 22 µg/m3 |
| Edgecombe | 10.4 µg/m3 | 22 µg/m3 |
| Forsyth | 11.8 µg/m3 | 26 µg/m3 |
| Gaston | 12.0 µg/m3 | 24 µg/m3 |
| Guilford | 11.3 µg/m3 | 24 µg/m3 |
| Haywood | 10.6 µg/m3 | 23 µg/m3 |
| Jackson | 10.4 µg/m3 | 23 µg/m3 |
| Lenoir | 9.7 µg/m3 | 21 µg/m3 |
| Martin | 9.5 µg/m3 | 20 µg/m3 |
| McDowell | 11.5 µg/m3 | 24 µg/m3 |
| Mecklenburg | 12.6 µg/m3 | 26 µg/m3 |
| Mitchell | 10.8 µg/m3 | 23 µg/m3 |
| Montgomery | 10.6 µg/m3 | 22 µg/m3 |
| Pitt | 9.5 µg/m3 | 21 µg/m3 |
| Robeson | 11.2 µg/m3 | 24 µg/m3 |
| Rowan | 12.3 µg/m3 | 24 µg/m3 |
| Swain | 11.0 µg/m3 | 23 µg/m3 |
| Wake | 11.2 µg/m3 | 26 µg/m3 |
| Watauga | 9.6 µg/m3 | 21 µg/m3 |
| Wayne | 11.1 µg/m3 | 23 µg/m3 |