Air quality permits are complex, we make it easier.

Emissions into the ambient air from equipment or operations that include criteria air pollutants (NOx, SOx, CO, Pb, Ozone, PM), volatile organic compounds (VOC), hazardous air pollutants (HAP), or greenhouse gases (e.g., CO2, CH4, N2O, fluorinated gases) require permitting and compliance with regulations.
Permit Applicability
We complete air emission calculations and review the air quality regulations to evaluate if your equipment/source requires an air permit in your location. Regulatory Review and Applicability includes (New Source Review (NSR, BACT, RACT, PSD). If exempt from permitting we provide you with that documentation.


Air Permits
FOURSES prepares air quality permit applications and renewals. They may be called plan approvals, construction, operation, minor source, or Title V (major source) permits. We have experience with all of them.
Compliance and Reporting
Once you have an air permit you have to comply with the permit requirements. We help you comply by completing annual emission inventories, greenhouse gas reporting and compliance certifications.

FOURSES was great at speaking the air quality language and working with the regulatory agency to get our air construction and operation permit approved.
— Manufacturing Client
FOURSES work on composting and regulation development helped with understanding our anerobic digestion process and the emission sources.
— Biogas Client