Potential to emit (PTE) is used for determining new source review and operating permit requirements, unless there are requirements based on industry source category.
The tables below contain the PTE thresholds used for determining the applicable operating permitting level. For example, the Registration Thresholds Table shows that a registration may be required for carbon monoxide emissions between 25 and 100 tons per year. A source with PTE less than the minimum Registration Thresholds is typically exempt from permit regulations.
As shown in the Title V Thresholds Table for Major Sources, there are lower thresholds for certain nonattainment areas so a source’s location may be a factor.
Applicants should refer to rules for permitting purposes, and contact IDEM for permitting assistance.
Note: PTE is calculated for use in permit determinations. PTE is different than actual emissions, which are based on the actual operating schedule and production levels and take into account air pollution controls that may be in place. Actual emissions are used for reporting purposes and evaluating compliance.
| Registration Thresholds Table | ||
|---|---|---|
| Type of Pollutant | Minimum Threshold (PTE Equal to or Greater Than) in Tons Per Year | Maximum Threshold (but Less Than) in Tons Per Year |
| Volatile organic compounds (VOCs) for sources not required to use air pollution control equipment to comply with the VOC emission rules | 10 | 25 |
| VOCs for sources that are required to use air pollution control equipment to comply with the VOC emission rules | 5 | 25 |
| Nitrogen dioxide and oxides of nitrogen (NOX) | 10 | 25 |
| Carbon monoxide (CO) | 25 | 100 |
| Sulfur dioxide (SO2) | 10 | 25 |
| Particulate matter (PM) | 5 | 25 |
| Particulate matter less than 10 microns (PM-10) | 5 | 25 |
| Lead | 0.2 (400 pounds) | 5 |
| Fluorides | 5 | 25 |
| Hydrogen sulfide | 5 | 25 |
| Total reduced sulfur | 5 | 25 |
| Reduced sulfur compounds | 5 | 25 |
| Title V Thresholds for Major Sources | |
|---|---|
| Type of Pollutant | PTE threshold in tons per year |
| VOCs (related to ozone formation) | 100 TPY in attainment areas 100 TPY in marginal nonattainment areas 100 TPY in moderate nonattainment areas 50 TPY in serious nonattainment areas 25 TPY in severe nonattainment areas 10 TPY in extreme nonattainment areas |
| NOX (related to ozone formation) | 100 TPY in attainment areas 100 TPY in marginal nonattainment areas 100 TPY in moderate nonattainment areas 50 TPY in serious nonattainment areas 25 TPY in severe nonattainment areas 10 TPY in extreme nonattainment areas |
| SO2 | 100 TPY |
| CO | 100 TPY |
| PM-10 | 100 TPY |
| Particulate matter smaller than 2.5 microns (PM-2.5) | 100 TPY |
| Lead | 100 TPY |
| A single hazardous air pollutant (HAP) | 10 TPY |
| A combination of HAPs | 25 TPY |
Note: Secondary lead smelters are required to have a Title V permit by 40 CFR 63 Subpart X.