An emissions inventory is an accounting of all air pollutant emissions emitted into the atmosphere. This accounting forms the basis for air quality planning that occurs at county, state and national levels.

Pursuant to Arizona Administrative Code, Title 18, Chapter 2, Section 327 (R18-2-327) , any source that is subject to a permit requirement should complete and submit to ADEQ an annual emissions inventory questionnaire. A current air pollutant emissions inventory of both permitted and non-permitted sources within the state is necessary to properly evaluate air quality program effectiveness, and to asses emission fees.

ADEQ is responsible for preparing and submitting an emissions inventory report to the EPA for sources and emission points prescribed in Code of Federal Regulations, Part 40, Section 51.322 (40 CFR 51.322) and for sources that require a permit under Arizona Revised Statute 49-426 for the following criteria pollutants: oxides of nitrogen (NO2), oxides of sulfur (SOx), volatile organic compounds (VOCs) which are precursors to ozone (O3), carbon monoxide (CO), lead (Pb), total particulate matter (PT), and particulate matter 10 microns or less in diameter (PM10).

ADEQ assesses fees based on the actual emissions submitted in the emission inventory for all sources under ADEQ jurisdiction pursuant to A.A.C. R18-2-326 . This inventory encompasses those sources under state jurisdiction emitting 1 ton/year or more of any individual regulated air pollutant, or 2.5 tons/year or more of any combination of regulated air pollutants as defined in A.A.C. R18-2-101.92 .

The Air Quality Division conducts annual workshops on the development and compilation of an emissions inventory. Training on the use of the emissions inventory reporting software is also provided. These workshops are held during February and March in Flagstaff, Kingman, Tucson, and Yuma. Information regarding the exact dates and locations is usually available in January.

Emissions Inventory Reporting Forms, Instructions and Software