Emissions Inventory

2011 Emission Inventory Surveys Distributed,
Annual Series of Workshops Announced

February 21, 2012 – Annual emission survey forms for reporting calendar year 2011 emissions are now being distributed via mail this week. These reports are due on Wednesday, May 23, 2012. Workshops to provide assistance in completing 2011 reports will be conducted on the following dates and times:

All emissions inventory workshops are held in the 9th-floor classroom at the Department’s offices, located at : 1001 N. Central Avenue in Phoenix. Space is limited, so RSVP’s are encouraged. Please email us at EmisInv@mail.maricopa.gov or call (602) 506-6790 to reserve a place for the specific workshop you plan to attend.

Revised PM₁₀ Emission Inventory for 2008 Released

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 (PM_2.5), nitrogen oxides (NO_X), sulfur oxides (SO_X), 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.

Background

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).