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Table 1. The following table shows 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 standard). In Counties with more than one PM2.5 monitoring site, the value reported is the highest 3-year average among the inclusive sites. All counties are attaining the national standard.
| County |
Average 98th Percentile |
| Alamance |
22 µg/m3 |
| Buncombe |
20 µg/m3 |
| Caswell |
19 µg/m3 |
| Catawba |
23 µg/m3 |
| Chatham |
20 µg/m3 |
| Cumberland |
23 µg/m3 |
| Davidson |
23 µg/m3 |
| Duplin |
19 µg/m3 |
| Durham |
21 µg/m3 |
| Edgecombe |
21 µg/m3 |
| Forsyth |
23 µg/m3 |
| Gaston |
22 µg/m3 |
| Guilford |
22 µg/m3 |
| Haywood |
23 µg/m3 |
| Jackson |
20 µg/m3 |
| Lenoir |
20 µg/m3 |
| Martin |
21 µg/m3 |
| McDowell |
21 µg/m3 |
| Mecklenburg |
24 µg/m3 |
| Mitchell |
19 µg/m3 |
| Montgomery |
21 µg/m3 |
| Pitt |
21 µg/m3 |
| Robeson |
22 µg/m3 |
| Rowan |
22 µg/m3 |
| Swain |
20 µg/m3 |
| Wake |
22 µg/m3 |
| Watauga |
17 µg/m3 |
| Wayne |
22 µg/m3 |
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