All4 Inc.

Air Quality Permitting


Obtaining a permit to construct for a new major source or for a major modification at an existing major source is arguably one of the most challenging tasks facing environmental managers today.  Increasingly stringent national ambient air quality standards (NAAQS), changes in attainment designations, nuances in State air permitting programs, revised U.S. EPA interpretations and guidance, rule revisions (e.g., tailoring rule,) and regulation by litigation (i.e., precedence) have made an already complex program even more complicated.  The two new source review (NSR) permitting programs that apply to major sources, prevention of significant deterioration (PSD) and/or nonattainment new source review (NNSR) are often viewed by sources as “dead-end” options to be avoided at all cost.

ALL4 is equipped to assist facilities address the entire spectrum of air quality permitting challenges from the completion of “general” permit applications to complex, multi-pollutant NSR projects.  ALL4 applies the collective knowledge and understanding of the engineering principles, air quality regulations, technical disciplines, air pollution control technologies, and experience to address our client’s air quality permitting needs.  We specialize in the more complicated air permitting projects that typically involve teaming closely with client staff across multiple organizational levels.  Our seasoned air quality staff works closely with a variety of our clients' technical departments, as well as senior-level management, while developing applications. We have found that successful air quality permitting projects occur as a direct result of effective project planning and strategy.  A successful air quality permitting strategy entails anticipating potential project pitfalls in advance and having contingency plans in place to respond to unanticipated events. ALL4 utilizes a proven air quality project planning system to ensure that there are no surprises.

ALL4 has extensive experience with a broad range of industries that encompasses air quality permitting projects involving both major and minor NSR including:

Permitting Experience:

  • PSD
  • NNSR
  • Plantwide Applicability Limits (PAL)
  • Title V
  • Synthetic Minor Operating Permits (SMOP)

Permitting-Related Expertise:

  • Emission Inventories
  • Emission Factor Development and Analysis
  • Best Available Control Technology (BACT) Determinations
  • Lowest Achievable Control Technology (LAER) Determinations
  • Reasonable Available Control Technology (RACT) Determinations
  • Best Available Retrofit Technology (BART) Determinations
  • Emission Offsets and Emission Trading
  • Air Quality Dispersion Modeling

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