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Table 1. The following table shows 28 counties with a 3-year average of the annual mean PM2.5 below the established standard. The first column lists the county; the second lists the average value for that county.
| County |
Average value |
| Alamance |
14.00 µg/m3 |
| Buncombe |
12.60 µg/m3 |
| Caswell |
13.40 µg/m3 |
| Chatham |
12.20 µg/m3 |
| Cumberland |
13.90 µg/m3 |
| Duplin |
11.60 µg/m3 |
| Durham |
13.70 µg/m3 |
| Edgecombe |
12.40 µg/m3 |
| Forsyth |
14.40 µg/m3 |
| Gaston |
14.40 µg/m3 |
| Haywood |
13.00 µg/m3 |
| Jackson |
12.00 µg/m3 |
| Lenoir |
11.20 µg/m3 |
| Martin |
11.10 µg/m3 |
| McDowell |
14.40 µg/m3 |
| Mecklenburg |
14.80 µg/m3 |
| Mitchell |
12.70 µg/m3 |
| Montgomery |
12.40 µg/m3 |
| New Hanover |
10.20 µg/m3 |
| Onslow |
11.20 µg/m3 |
| Orange |
13.20 µg/m3 |
| Pitt |
11.60 µg/m3 |
| Robeson |
12.80 µg/m3 |
| Rowan |
14.20 µg/m3 |
| Swain |
12.40 µg/m3 |
| Wake |
13.60 µg/m3 |
| Watauga |
11.90 µg/m3 |
| Wayne |
13.10 µg/m3 |
Table 2 The following table shows 2 counties with a 3-year average of the annual mean PM2.5 above the established standard. The first column lists the county; the second lists the average value for that county.
| County |
Average value |
| Catawba |
15.40 µg/m3 |
| Davidson |
15.20 µg/m3 |
Table 3 The following table shows the estimated 3-year average of the
annual mean PM2.5 for 1 county that did not have a complete and valid average of PM2.5 concentrations in 2006. In lieu of measured concentrations we used the statistical relationships between this monitor's data and 4 well-correlated surrounding monitors to impute a good representation of the missing samples that were needed to complete the historical average.
| County |
Average value |
| Guilford |
14.00 µg/m3 |
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