Wyoming Department of Environmental Quality (WDEQ) – Upper Green River Basin Area (UGRB)
EPA has classified Upper Green River Basin Area (UGRB), WY as Marginal Nonattainment for Ozone under the 2008 NAAQS Standard and includes Sublette County as well as portions of Lincoln and Sweetwater County.
To satisfy offset requirements, new or modified major facilities in nonattainment areas must obtain ERCs to satisfy the offset ratio requirements for proposed emission increases. The offset ratio for Marginal nonattainment area for ozone is 1.1 to 1. That means if 100 tpy of VOCs are emitted from a proposed new or modified major facility in the UGRB the facility must obtain 110 tpy of ERCs to offset the increase in VOC emissions.
| 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 |
Facilities that were emitting NOx and VOC 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.