PM2.5 Design Values for 1999-2001 in NC Counties

A map of estimated annual mean PM2.5 in 24 hour concentrations for January 1999 through December 2001.

Figure 1 Annual Design Values (Mean) (click for larger image)

Table 1. The following table shows 11 counties with a 3-year average of the annual mean PM_2.5 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	14.6 µg/m3
Buncombe	14.4 µg/m3	at least one calendar quarter was not valid
Caswell	14.5 µg/m3	at least one calendar quarter was not valid
Chatham	13.4 µg/m3	at least one calendar quarter was not valid
Duplin	12.6 µg/m3
Lenoir	12.3 µg/m3
New Hanover	12.2 µg/m3
Onslow	12.1 µg/m3
Orange	14.3 µg/m3
Pitt	13.7 µg/m3	at least one calendar quarter was not valid
Swain	14.1 µg/m3

Table 2. The following table shows 14 counties with a 3-year average of the annual mean PM_2.5 for each year above 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.

Note: Nonattainment designations may not follow county boundaries and will be based on later data than are shown in this table.

County	Average value	Additional comment
Cabarrus	15.6 µg/m3
Catawba	17.0 µg/m3	at least one calendar quarter was not valid
Cumberland	15.4 µg/m3
Davidson	17.3 µg/m3	at least one calendar quarter was not valid
Durham	15.3 µg/m3
Forsyth	16.1 µg/m3
Gaston	15.3 µg/m3
Guilford	16.3 µg/m3
Haywood	15.2 µg/m3
McDowell	15.8 µg/m3
Mecklenburg	16.6 µg/m3
Mitchell	15.3 µg/m3
Wake	15.3 µg/m3
Wayne	15.3 µg/m3

Table 3. The following table shows 6 counties that were monitored in 2001 but did not have enough historical data to calculate a valid 3-year average of the annual mean PM_2.5 that could be compared to the established standard.

County	Average value
Edgecombe	N/A µg/m3
Jackson	N/A µg/m3
Montgomery	N/A µg/m3
Pasquotank	N/A µg/m3
Robeson	N/A µg/m3
Watauga	N/A µg/m3