Every three years the Maricopa County Air Quality Department (MCAQD) prepares periodic emissions inventory reports for pollutants.
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 nonattainment areas. Annual and season-day emissions are provided for all source categories.
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 nonattainment area. Annual and typical daily emissions are provided for all source categories.
This inventory includes emissions of carbon monoxide (CO) for both Maricopa County and the CO maintenance area. Annual and season-day emissions are provided for all source categories. Periodic emissions inventories for CO were not prepared in 2011, 2014, or 2017 because Maricopa County has been redesignated as attainment for CO.