Emissions inventory workshops to provide assistance in completing the 2012 reports have concluded for the 2013 calendar year.
A new schedule of workshops will be posted in January 2014 for help in completing the 2014 reports. If you have questions regarding emissions inventories please call (602) 506-6790 for assistance.
This updated emission inventory report (revised June 2011) includes
emissions of 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 nonattainment area. Annual totals as well as
typical daily emissions are provided for each source category included in the report. This report includes
revisions made in 2011, to reflect changes resulting from (1) refined windblown dust estimation methods, (2)
updated estimates of rule effectiveness for certain source categories, and (3) revised estimates for onroad
mobile sources using EPA's new MOVES2010a model vs. earlier results using MOBILE6.2.
The Maricopa County Air Quality Department's (MCAQD) Emissions Inventory (EI)
Section collects, reviews, stores and manages stationary source air pollution emissions data for sources in Maricopa County.
The EI Section also collects emission fees from Title V sources and provides data to county, state and federal agencies.
A point source emissions inventory shows annual air pollutant emissions for
one specific business location. An emissions inventory may be requested by MCAQD of any facility with an air quality permit
in Maricopa County. Each January, the EI Unit distributes reporting forms and instructions to those businesses that have been
requested to submit an emissions report for the prior calendar year.
Annual emissions inventories serve a number of purposes:
- They help determine a source's compliance with its air quality permit conditions as well as Maricopa County rules and regulations.
- They help identify pollutant sources that may need new or additional controls, and thus provide a basis for improved air pollution control strategies.
- They also provide a means of assessing progress in achieving reductions from existing controls.
- They provide the basis for determining annual emission fees from Title V sources.
- Inventory data are used as input for air quality modeling to demonstrate attainment of national ambient air quality standards (NAAQS).