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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 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 |
| Alamance |
13.8 µg/m3 |
| Buncombe |
12.6 µg/m3 |
| Caswell |
13.1 µg/m3 |
| Chatham |
12.0 µg/m3 |
| Cumberland |
13.6 µg/m3 |
| Duplin |
10.9 µg/m3 |
| Durham |
13.4 µg/m3 |
| Edgecombe |
12.4 µg/m3 |
| Forsyth |
14.1 µg/m3 |
| Gaston |
14.1 µg/m3 |
| Guilford |
13.9 µg/m3 |
| Haywood |
13.0 µg/m3 |
| Jackson |
12.4 µg/m3 |
| Lenoir |
10.9 µg/m3 |
| Martin |
10.6 µg/m3 |
| McDowell |
14.3 µg/m3 |
| Mecklenburg |
14.8 µg/m3 |
| Mitchell |
12.7 µg/m3 |
| Montgomery |
12.2 µg/m3 |
| New Hanover |
9.7 µg/m3 |
| Onslow |
10.5 µg/m3 |
| Orange |
12.9 µg/m3 |
| Pitt |
11.3 µg/m3 |
| Robeson |
12.8 µg/m3 |
| Rowan |
14.0 µg/m3 |
| Swain |
12.8 µg/m3 |
| Wake |
13.5 µg/m3 |
| Watauga |
11.9 µg/m3 |
| Wayne |
12.6 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 |
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