Periodic Emission Inventory Reports

Every three years the Maricopa County Air Quality Department (MCAQD) prepares periodic emissions inventory reports for nonattainment pollutants.

Ozone Precursors

The ozone periodic emissions inventories include emission estimates for volatile organic compounds (VOC), nitrogen oxides (NOX) and carbon monoxide (CO), which are all precursors to ozone formation. Emissions are calculated for Maricopa County and both 8-hour ozone non-attainment areas. Annual and season-day emissions are provided for all source categories.

Particulate Matter 10 (PM10)

The particulate matter emissions inventories include emissions estimates for particulate matter less than 10 microns in diameter (PM10), particulate matter less than 2.5 microns in diameter (PM2.5), NOX, sulfur oxides (SOX), and ammonia (NH3). Emissions are calculated for Maricopa County and the PM10 non-attainment area. Annual and season-day emissions are provided for all source categories.

Carbon Monoxide

This inventory includes emissions of CO for both Maricopa County and the CO maintenance area. Annual and season-day emissions are provided for all source categories. CO emissions inventories were not prepared in 2011, 2014, or 2017 because Maricopa County has been redesignated as attainment for carbon monoxide.

For past periodic emissions inventory reports, submit a Public Records Request to MCAQD.
Page reviewed 23 April 2020