2011 Periodic Emissions Inventory

Ozone Precursors


This inventory includes emission estimates for volatile organic compounds (VOC), nitrogen oxides (NOx) and carbon monoxide (CO). Emissions are calculated for both Maricopa County and the 8-Hour Ozone Non-attainment Area. Annual totals as well as season-day emissions are provided for all source categories.

An addendum for Ozone Precursors for the Maricopa County, Arizona, 8-Hour Ozone Non-attainment Area, originally published in February 2014, was published in August 2015.

  • It adds a facility to the list of available Emission Reduction Credits (ERCs) in the Arizona Emissions Bank.
  • In response to inquiries from Environmental Protection Agency (EPA) staff, it provides a "recasting" of the emissions calculations to develop an ozone season-day inventory reflecting the June-August 2011 period (versus the July-September addressed in the original PEI report).
  • It provides further details on facility-specific emissions levels from County-permitted sources that are reflected in the original PEI report as area-source (nonpoint) emissions in Chapter 3.

Particulate Matter 10 (PM10)


This inventory includes emissions estimates for coarse particulate matter <10 µm in diameter (PM10), fine particulate matter <2.5 µm (PM2.5), nitrogen oxides (NOx), sulfur oxides (SOx), and ammonia (NH3). Emissions are calculated for both Maricopa County and the PM10 non-attainment area. Annual totals as well as typical daily emissions are provided for all source categories.