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There are no counties with a 3-year average of the annual mean PM2.5 for each year above the established standard.
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. 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 |
12.9 µg/m3 |
| Buncombe |
11.2 µg/m3 |
| Caswell |
12.4 µg/m3 |
| Catawba |
14.2 µg/m3 |
| Chatham |
11.6 µg/m3 |
| Cumberland |
13.0 µg/m3 |
| Davidson |
14.5 µg/m3 |
| Duplin |
10.5 µg/m3 |
| Durham |
11.6 µg/m3 |
| Edgecombe |
11.8 µg/m3 |
| Forsyth |
13.3 µg/m3 |
| Gaston |
13.4 µg/m3 |
| Guilford |
12.8 µg/m3 |
| Haywood |
12.4 µg/m3 |
| Jackson |
11.3 µg/m3 |
| Lenoir |
10.4 µg/m3 |
| Martin |
10.4 µg/m3 |
| McDowell |
13.0 µg/m3 |
| Mecklenburg |
13.7 µg/m3 |
| Mitchell |
11.6 µg/m3 |
| Montgomery |
11.7 µg/m3 |
| Pitt |
11.4 µg/m3 |
| Robeson |
12.2 µg/m3 |
| Rowan |
13.6 µg/m3 |
| Swain |
11.9 µg/m3 |
| Wake |
12.5 µg/m3 |
| Watauga |
10.7 µg/m3 |
| Wayne |
12.2 µg/m3 |
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