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The following table shows 24 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. Some entries have an additional comment indicating the design value given is based on incomplete data.
| County |
Average value |
Additional comment |
| Alamance | 14.5 µg/m3 |
at least one calendar quarter was not valid |
| Buncombe | 14.6 µg/m3 |
|
| Caswell | 14.0 µg/m3 |
|
| Chatham | 12.8 µg/m3 |
|
| Cumberland | 14.7 µg/m3 |
|
| Duplin | 12.6 µg/m3 |
|
| Edgecombe | 14.1 µg/m3 |
at least one calendar quarter was not valid |
| Gaston | 14.7 µg/m3 |
|
| Haywood | 14.6 µg/m3 |
|
| Jackson | 13.3 µg/m3 |
at least one calendar quarter was not valid |
| Lenoir | 12.1 µg/m3 |
|
| Mitchell | 14.0 µg/m3 |
|
| Montgomery | 13.0 µg/m3 |
|
| New Hanover | 11.5 µg/m3 |
|
| Onslow | 11.6 µg/m3 |
|
| Orange | 13.6 µg/m3 |
|
| Pasquotank | 12.0 µg/m3 |
|
| Pitt | 13.0 µg/m3 |
|
| Robeson | 12.8 µg/m3 |
at least one calendar quarter was not valid |
| Swain | 13.4 µg/m3 |
|
| Wake | 14.6 µg/m3 |
|
| Watauga | 11.7 µg/m3 |
at least one calendar quarter was not valid |
| Wayne | 14.6 µg/m3 |
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The following table shows 7 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.
Note: Nonattainment designations may not follow county boundaries and will be based on later data than are shown in this table.
| County |
Average value |
| Cabarrus | 15.1 µg/m3 |
| Catawba | 16.4 µg/m3 |
| Davidson | 16.8 µg/m3 |
| Forsyth | 15.6 µg/m3 |
| Guilford | 15.2 µg/m3 |
| McDowell | 15.6 µg/m3 |
| Mecklenburg | 15.8 µg/m3 |
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