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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 |
11.6 µg/m3 |
| Buncombe |
9.9 µg/m3 |
| Caswell |
10.7 µg/m3 |
| Catawba |
12.5 µg/m3 |
| Chatham |
10.2 µg/m3 |
| Cumberland |
11.7 µg/m3 |
| Davidson |
13.0 µg/m3 |
| Duplin |
9.6 µg/m3 |
| Durham |
10.8 µg/m3 |
| Edgecombe |
10.4 µg/m3 |
| Forsyth |
11.8 µg/m3 |
| Gaston |
12.0 µg/m3 |
| Guilford |
11.3 µg/m3 |
| Haywood |
10.6 µg/m3 |
| Jackson |
10.4 µg/m3 |
| Lenoir |
9.7 µg/m3 |
| Martin |
9.5 µg/m3 |
| McDowell |
11.5 µg/m3 |
| Mecklenburg |
12.6 µg/m3 |
| Mitchell |
10.8 µg/m3 |
| Montgomery |
10.6 µg/m3 |
| Pitt |
9.5 µg/m3 |
| Robeson |
11.2 µg/m3 |
| Rowan |
12.3 µg/m3 |
| Swain |
11.0 µg/m3 |
| Wake |
11.2 µg/m3 |
| Watauga |
9.6 µg/m3 |
| Wayne |
11.1 µg/m3 |
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