Air Quality

Air Quality Impact Evaluation

An Air Quality Impact Evaluation (AQIE) is an evaluation, using approved computer models, of the ambient air quality impacts that the public may be expected to be exposed to due to air pollution emissions from one or more facilities.  The pollutants emitted by the facility, the emission rates, stack parameters (e.g. heights, flow rates, temperature), building parameters, terrain, and meteorology are all taken into account to predict potential ambient impacts caused by the facility.  An AQIE may be conducted for criteria pollutants (e.g. CO, NOx, PM, SO2) or hazardous air contaminants (e.g.

State Implementation Plans

The federal Clean Air Act requires states to submit plans to ensure the attainment and maintenance of national ambient air quality standards (NAAQS). The common term used to refer to these federally enforceable plans is "State Implementation Plans" or SIPs. The six criteria pollutants as defined by the U.S. Environmental Protection Agency (EPA) are carbon monoxide, lead, nitrogen dioxide, ozone, particulate matter, and sulfur dioxide. SIPs are also prepared to protect visibility at federal Class I areas consisting of national parks and wilderness areas.

Point Source Registration

Air Consultants Directory

The Air Quality and Climate Division maintains two consulant lists.  One contains  consultants who offer Air Permit Application services; the second holds those who offer Stack Emission Testing services.  These lists are meant to provide services to facilities seeking assistance in preparation of applications or conducting stack emission testing.

Transfer of Permit Ownership

Transfer of Permit Ownership Procedures

The Air Quality & Climate Division  requires an amendment of an existing Air Pollution Control Permit whenever there is a change in ownership of a facility. The procedures that must be followed in amending the Permit depend on the degree of changes that will occur at the facility as a result of the change in ownership.

Permit Fees

The Air Permitting & Engineering Section of the Air Quality & Climate Division currently assesses permit application fees for issuance of Permits to Construct and Transfers of Permit Ownership.  No permit application fees are assessed for issuance of Permits to Operate unless modifications to the facility are proposed that require a Permit to Construct in which case the Permit to Construct fees then apply.  These fees are set forth in 3 V.S.A. 2822(j)(1)(A).

Source Categories

These pages are intended to provide overviews on regulatory concerns and requirements for specific source categories. They are not intended to provide a complete, detailed review for each category. Those seeking more specific information  are encouraged to contact the  AQCD Permits & Engineering Section.


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