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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. Averages for the counties marked with an
asterisk are "unofficial estimates", because a sample size requirement ("data
completeness") was not satisfied.
| County |
Average 98th Percentile |
| Alamance | 31 µg/m3 |
| Buncombe | 30 µg/m3 |
| Caswell | 29 µg/m3 |
| Catawba | 35 µg/m3 |
| Chatham | 27 µg/m3 |
| Cumberland | 31 µg/m3 |
| Davidson | 31 µg/m3 |
| Duplin | 30 µg/m3 |
| Durham | 31 µg/m3 |
| Edgecombe | 27 µg/m3 |
| Forsyth | 32 µg/m3 |
| Gaston | 31 µg/m3 |
| Guilford* | 31 µg/m3 |
| Haywood | 28 µg/m3 |
| Jackson | 25 µg/m3 |
| Lenoir | 25 µg/m3 |
| Martin | 26 µg/m3 |
| Mc Dowell | 32 µg/m3 |
| Mecklenburg | 32 µg/m3 |
| Mitchell | 31 µg/m3 |
| Montgomery | 29 µg/m3 |
| New Hanover* | 25 µg/m3 |
| Onslow | 25 µg/m3 |
| Orange | 30 µg/m3 |
| Pitt | 26 µg/m3 |
| Robeson | 30 µg/m3 |
| Swain | 26 µg/m3 |
| Wake | 31 µg/m3 |
| Watauga | 30 µg/m3 |
| Wayne | 30 µg/m3 |
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