Air Permitting 101: Common Pitfalls & Realistic Timelines

Air permitting is often one of the most misunderstood aspects of environmental compliance. Companies frequently expect the permitting process to be straightforward or quick, only to encounter unexpected delays, additional regulatory requirements, or costly project delays. By understanding the process - and the common pitfalls - companies can anticipate problems and keep projects on schedule.

Air Permit Basics

Air permits regulate emissions from equipment and process operations that release air pollutants which include primary air pollutants (e.g., volatile organic compounds [VOCs] or particulate matter [PM]), hazardous air pollutants (HAPs), or state level air toxics. Depending on the type of operation, emissions levels, and regulatory thresholds, a facility may be required to maintain documentation of exemption status, obtain registration or permit by rule, a construction permit, operating permit, or synthetic minor permit.

Permitting requirements may be triggered by:

• Installation of new process or air emissions control equipment
• Process modifications
• Increases in production or production hours
• Changes in materials (e.g., coatings, solvents, fuels)
• Small changes can alter a facility’s potential to emit and trigger additional regulatory requirements.

Common Air Permitting Pitfalls

Common pitfalls to air permitting include:

• Waiting Too Late to Evaluate Permitting Needs - One of the most common issues occurs when permitting is considered after equipment has already been purchased or installation is underway. Air permits often must be obtained before construction or modification begins, and failure to do so can result in violations, project delays, or enforcement actions.
• Confusing Actual vs. Potential Emissions - Facilities often focus on actual emissions based on typical production levels. Regulators, however, frequently evaluate potential emissions, or the maximum emissions a facility could generate if equipment operates at full capacity. This distinction can significantly change the permitting outcome.
• Underestimating Air Toxics or Control Requirements - Even when criteria pollutant emissions appear low, air toxics or hazardous air pollutants may trigger additional requirements such as control technologies, stack parameters, or modeling.
• Overlooking Recordkeeping and Compliance Requirements - Permits rarely just limit emissions - they also establish ongoing monitoring, recordkeeping, and reporting obligations. Facilities that do not plan for these requirements may struggle to maintain compliance after a permit is issued.
• Not Accounting for Future Expansion - Permitting decisions made for today’s production levels may unintentionally limit future growth. Taking a strategic approach to permit limits and operational flexibility can prevent the need for another permit revision later.

Typical Air Permitting Timelines

Permitting timelines vary widely by state, permit type, and the complexity of emissions - with typical timelines for permit levels below:

Additional time may be required for agency questions, public notice periods, or revisions to the application.

Summary

Air permitting does not need to be a barrier to operational growth, but it does require careful planning and a clear understanding of regulatory expectations. Facilities that address permitting early in the project lifecycle are far more likely to avoid delays, enforcement issues, and costly redesigns. Aeterra works with our clients to provide clear permitting strategy to reduce project risk.