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2019-2020 Annual Monitoring Network Plan for North Carolina Air Quality

The North Carolina Division of Air Quality, DAQ, operates a network of air quality monitors across the state. The network:

  • Includes 75 monitors at multiple sites
  • Measures the concentration of regulated pollutants in the ambient or outdoor air (including ozone, lead, fine particles, nitrogen oxides, sulfur dioxide and carbon monoxide)
  • Compares concentrations to the national ambient air quality standards, NAAQS, as set by the United States Environmental Protection Agency (EPA)
  • Reports any violations and takes regulatory action to return the ambient air quality to acceptable levels.

Every year the monitoring network is re-evaluated and adjusted to ensure it is providing adequate coverage. In most years these adjustments include starting new monitors, shutting down others, or simply relocating established monitors.

The proposed annual network plan is subject to a 30-day public review period prior to being submitted to EPA for approval. A summary of significant network changes is below:


The North Carolina Network currently consists of fifty (50) Monitoring Sites.  Thirty-eight (38) are operated by DAQ; four (4) are operated by Mecklenburg County Air Quality, MCAQ; three (3) are operated by Western North Carolina Regional Air Quality Agency; three (3) are operated by Forsyth County and two (2) are operated by Duke Progress Energy.

The Ozone, O3, Network

  • No significant changes are proposed.

Particulate Matter, PM2.5 & PM10, Network

  • No significant changes are proposed.

Sulfur Dioxide, SO2, Network

  • The DAQ proposes shutting down the two Duke Progress Energy sites sometime in 2020.

Nitrogen Dioxide, NO2, Network

  • No significant changes are proposed.

Carbon Monoxide, CO, Network

  • No significant changes are proposed.

2019-2020 Annual Monitoring Network Plan