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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 and 31 counties with 3-year averages for the 98th percentile of PM2.5 concentrations below the established standards 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 |
13.8 µg/m3 |
32 µg/m3 |
| Buncombe |
12.6 µg/m3 |
30 µg/m3 |
| Caswell |
13.1 µg/m3 |
30 µg/m3 |
| Catawba |
(see Table 2) |
34 µg/m3 |
| Chatham |
12.0 µg/m3 |
27 µg/m3 |
| Cumberland |
13.6 µg/m3 |
30 µg/m3 |
| Davidson |
(see Table 2) |
31 µg/m3 |
| Duplin |
10.9 µg/m3 |
28 µg/m3 |
| Durham |
13.4 µg/m3 |
30 µg/m3 |
| Edgecombe |
12.4 µg/m3 |
27 µg/m3 |
| Forsyth |
14.1 µg/m3 |
32 µg/m3 |
| Gaston |
14.1 µg/m3 |
31 µg/m3 |
| Guilford |
13.9 µg/m3 |
30 µg/m3 |
| Haywood |
13.0 µg/m3 |
28 µg/m3 |
| Jackson |
12.4 µg/m3 |
27 µg/m3 |
| Lenoir |
10.9 µg/m3 |
25 µg/m3 |
| Martin |
10.6 µg/m3 |
23 µg/m3 |
| McDowell |
14.3 µg/m3 |
32 µg/m3 |
| Mecklenburg |
14.8 µg/m3 |
32 µg/m3 |
| Mitchell |
12.7 µg/m3 |
32 µg/m3 |
| Montgomery |
12.2 µg/m3 |
29 µg/m3 |
| New Hanover |
9.7 µg/m3 |
25 µg/m3 |
| Onslow |
10.5 µg/m3 |
25 µg/m3 |
| Orange |
12.9 µg/m3 |
29 µg/m3 |
| Pitt |
11.3 µg/m3 |
25 µg/m3 |
| Robeson |
12.8 µg/m3 |
30 µg/m3 |
| Rowan |
14.0 µg/m3 |
30 µg/m3 |
| Swain |
12.8 µg/m3 |
28 µg/m3 |
| Wake |
13.5 µg/m3 |
32 µg/m3 |
| Watauga |
11.9 µg/m3 |
30 µg/m3 |
| Wayne |
12.6 µg/m3 |
30 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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