North Carolina Counties with 8-Hour Ozone Violations 2011-2013

Table 1. One county, Mecklenburg, had a 3-year average of the annual 4th high value for each year equaling 0.076 ppm level or higher (violation of the 8-hour standard established in 2008). The first column lists the county; the second lists the average value for that county. On the 2011-2013 Design Value Map, Mecklenburg County is colored orange. Note: Violations occur when the annual 4th highest value averaged over a three year period equals 0.076 ppm or higher. Violating counties are colored orange in the map.

Counties Violating the 2008 8-hour Ozone Standard
County 2011-2013 Average Value
Mecklenburg 0.078 ppm

 

 

 

 

Table 2. Thirty-two monitored counties are attaining the 0.076 ppm standard that was established in 2008. The first column lists the county; the second lists the average value for that county. On the 2011-2013 Design Value Map, these counties are colored green.

Counties Attaining the 2008 8-Hour Ozone Standard
County 2011-2013 Average Value
Alexander 0.065 ppm
Avery 0.063 ppm
Buncombe 0.065 ppm
Caldwell 0.064 ppm
Carteret 0.061 ppm
Caswell 0.069 ppm
Chatham 0.061 ppm
Cumberland 0.069 ppm
Davie 0.069 ppm
Durham 0.068 ppm
Edgecombe 0.069 ppm
Forsyth 0.073 ppm
Franklin 0.068 ppm
Graham 0.068 ppm
Granville 0.069 ppm
Guilford 0.072 ppm
Haywood 0.069 ppm
Johnston 0.070 ppm
Lenoir 0.067 ppm
Lincoln 0.072 ppm
Macon 0.063 ppm
Martin 0.066 ppm
Montgomery 0.066 ppm
New Hanover 0.064 ppm
Person 0.069 ppm
Pitt 0.069 ppm
Rockingham 0.069 ppm
Rowan 0.073 ppm
Swain 0.058 ppm
Union 0.070 ppm
Wake 0.071 ppm
Yancey 0.068 ppm

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Note:

  1. 2008 Ozone Standard = 0.075 parts per milion (ppm).
  2. Not all counties are required to monitor.
  3. Additional counties may be involved in emission reduction strategies.
  4. Nonattainment designation may differ from county boundaries.
  5. Attaining counties are colored green in the map.
  6. Final data validation is not yet complete.