Arizona Department of Environmental Quality (ADEQ) - Phoenix – Mesa Nonattainment Area
The Arizona Department of Environmental Quality (ADEQ) oversees the Phoenix-Mesa area (Maricopa County and parts of Pinal County)
and is classified as a Moderate nonattainment area under the 2015 ozone NAAQS.
Under federal nonattainment New Source Review (NSR) regulations, new or modified major stationary sources in these ozone nonattainment areas must obtain Emission Reduction Credits (ERCs) to offset proposed emissions of ozone precursors—nitrogen oxides (NOx) and volatile organic compounds (VOC). For a Moderate nonattainment classification, the required offset ratio is 1.15 to 1. For example, a facility proposing 100 tons per year (tpy) of VOCs must secure 115 tpy of VOC ERCs.
| Pollutant | New Major Source Emission Rates | Major Modification to existing Source |
|---|---|---|
| Nitrogen oxides (NOx) | ≥100 tons/year | ≥40 tons/year |
| Volatile Organic compounds (VOC) | ≥100 tons/year | ≥40 tons/year |
| Particulate Matter (PM10) | ||
| Sulfur Oxides (SOx) |
Facilities that were emitting NOx, VOC, PM10 or SOx may be eligible to generate Emission Reduction Credits (ERCs) with a permanent reduction of those emissions generating from a shutdown or installation of control technology or process change.
If your company has a new project that exceeds thresholds or had a facility with permanent reduction of emissions at any level, please reach out to see how Emissions Experts can assist.