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New Hampshire Department of Environmental Services

What Sources Need an Air Permit?

Sources of air emissions which require permits include point sources (major stationary commercial and industrial facilities), area sources (smaller stationary sources like dry cleaners and print shops), and devices (individual burners, furnaces, machines, etc.). The table below details the source/device threshold limits which trigger the requirement for obtaining an air permit from the Air Resources Division.

In addition to the specific sources/devices listed in the table, the Rules contain other conditions under which a source would be required to obtain a permit. Examples of these conditions include:

  • Sources choosing to limit their potential to emit by accepting enforceable permit conditions;
  • Sources at which documented and repeated violations occur of any of the applicable opacity or emission limits found in the Rules;
  • Sources at which documented and repeated violations of any NAAQS occur and the source is a significant contributor to the violation;
  • Sources subject to "New Source Review", a pollutant-specific program for new sources or modifications to sources which have emission levels above certain applicability thresholds;
  • Sources subject to National Emission Standards for Hazardous Air Pollutants (NESHAP) for source categories defined in federal regulations 40 CFR Parts 61 and 63;
  • Sources operating as treatment, storage or disposal facilities under the NH Hazardous Waste Rules;
  • Sources subject to the Rules governing Air Toxic Pollutants;
  • Sources subject to the Rules governing reasonably available control technology (RACT) for volatile organic compounds (VOCs) or nitrogen oxides (NOx);
  • Sources where a permit is required in order to achieve compliance with NAAQS;
  • Sources affected by or opting into the Acid Rain program under Title IV of the federal Clean Air Act Amendments of 1990; and
  • Sources defined in the Rules as "major sources", as determined by the type and amount of pollutant emitted from the source and the geographical location of the source (required by Title V of the federal Clean Air Act Amendments of 1990).
Devices and Sources Which Require Permits for Air Emissions
Device/Source Design Rating Fuel
Fuel Burning Device >= 10 million BTU/hr Natural Gas, LP Gas, #2 fuel oil
Fuel Burning Device >= 4 million BTU/hr #4 fuel oil
Fuel Burning Device >= 2 million BTU/hr coal, wood, #6 fuel oil, used oil
Internal Combustion Engine

(One or more at a source; design rating threshold is combined total of all engines)
>= 1.5 million BTU/hr liquid fuel oil
>= 10 million BTU/hr Natural Gas or LP Gas
Potential to emit > 25 tons per year of any single regulated air pollutant
Incinerator >= 1,000 lbs/hr Type 0, 1, 2, 3 waste
Incinerator >= 200 lbs/hr Type 4, 5, 6, 7 waste
Stationary Source, Area Source, or Device Total actual photochemically-reactive VOC emissions >= 10 tons per year
Aboveground, Vertical, VOC Storage Tank Capacity 40,000 gallons containing VOCs with a true vapor pressure >= 1.52 psia at 60EF
Device for loading tank trucks with gasoline at a gasoline terminal Design throughput >= 20,000 gal/day
Woodworking Device employing pneumatic transfer system, using a cyclone but no baghouse, for collecting any amount of sander dust Wood waste collection rate >= 20 tons/yr
Pneumatic dust transfer equipment used to convey materials, other than wood waste, into bins or silos, and not using a baghouse or filter for controlling dust
Fixed non-metallic mineral processing plant or coal crusher Design throughput >= 25 tons/hr
Portable sand and gravel or crushed stone plant or coal crusher Design throughput > 150 tons/hr

NH Department of Environmental Services | 29 Hazen Drive | PO Box 95 | Concord, NH 03302-0095
(603) 271-3503 | TDD Access: Relay NH 1-800-735-2964 | Hours: M-F, 8am-4pm

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