Developing a Periodic Emissions Inventory for Ozone Precursors. PAG Air Quality Forum June 23, 2015

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1 Developing a Periodic Emissions Inventory for Ozone Precursors PAG Air Quality Forum June 23, 2015

2 Developing a Periodic Emissions Inventory for Ozone Precursors What is an emission inventory? A current, comprehensive listing, by source type, of air pollutant emissions for a specific geographic area a specific time period well-defined set of uses Maricopa County Air Quality Department

3 Maricopa County Nonattainment Areas

4 Source Categories Nonpoint (Area) Nonroad Mobile Onroad Mobile Biogenic Point

5 Developing a Periodic Emissions Inventory for Ozone Precursors EIs use a variety of calculation methods Collect and analyze data from sources Collect and analyze data from other entities Apply specialized emission modeling tools Use national, regional or state-based data Rely on US EPA emission methods/estimates Develop new approaches Maricopa County Air Quality Department

6 Developing a Periodic Emissions Inventory for Ozone Precursors EIs use a variety of calculation methods "Bottom-up" vs. "top-down" Source-specific Requires detailed data Higher accuracy but is resourceintensive More general Uses national, regional or statebased data May be less accurate, but requires fewer resources

7 Developing a Periodic Emissions Inventory for Ozone Precursors Collect, analyze data from sources Conduct comprehensive sitespecific surveys of several hundred large industrial facilities Maricopa County Air Quality Department Survey annual activity for key source categories like natural gas distribution, structure/vehicle fires, locomotive diesel use, etc.

8 Developing a Periodic Emissions Inventory for Ozone Precursors Collect, analyze data from other entities MCAQD: Permits for earthmoving, open-burn activity, stationary sources ADEQ: State-permitted portable sources, prescribed burning activity Maricopa County Air Quality Department ADOT: Vehicle miles traveled, gasoline sales taxes US Census County Business Patterns, AZ Ag. Statistics, State Forestry Div. MAG: Data on land use, economic growth, demographics

9 Developing a Periodic Emissions Inventory for Ozone Precursors Use specialized emission modeling tools MOVES (onroad mobile sources) NONROAD (offroad engines) EDMS (aircraft) MEGAN (biogenic emissions)

10 Developing a Periodic Emissions Inventory for Ozone Precursors Use national, regional, state-based data Architectural coatings Consumer solvent use Biological human processes Maricopa County Air Quality Department

11 Developing a Periodic Emissions Inventory for Ozone Precursors Use US EPA default emissions estimates Agricultural pesticide use Residential wood burning Portable fuel containers Maricopa County Air Quality Department Or develop new approaches: Windblown dust

12 Data analysis, QA/QC, review cycle(s)...

13 2011 VOC Emissions (8-Hour Ozone Nonattainment Area Total =129,129 tons/yr) 2% 1% Source Categories Point/area sources 22% Fuel combustion & fires Solvent use 43% VOC storage/transport 4% Nonroad mobile sources Onroad mobile sources 9% Biogenics (d MCAQD, EI Unit, Jan. 2014

14 160, ,000 Annual VOC Emissions by Source Category 148,211 TPY 129,129 TPY (8-hr Ozone NAA, tons/yr) Source Category Point and area sources 120,000 Fuel combustion and fires 100,000 Solvent use 80,000 VOC storage/transport 60,000 Nonroad mobile sources 40,000 20, Onroad mobile sources Biogenic sources dummy MCAQD, EI Unit, Jan. 2014

15 2011 NO x Emissions (8-Hour Ozone NAA Total = 85,928 tons/yr) 1% 2% 6% Source Categories Point/area sources 25% Fuel combustion and fires Nonroad mobile sources Onroad mobile sources Biogenics 66% (d MCAQD, EI Unit, Jan. 2014

16 Annual NOx Emissions by Source Category (8-hr Ozone NAA, in tons/year) 100,000 90,000 89,479 TPY 85,928 TPY Source Category 80,000 Point and area sources 70,000 Fuel combustion and fires 60,000 50,000 Nonroad mobile sources 40,000 Onroad mobile sources 30,000 20,000 Biogenics sources 10,000 dummy MCAQD, EI Unit, Feb. 2014

17 Maricopa County Air Quality Department Developing a Periodic Emissions Inventory for Ozone Precursors Written Reports (> 200-page. cookbook ) Detailed documentation including: Procedures used to collect (or estimate) input data, Calculation methods used, Any simplifying assumptions made, and Documentation of reference materials; full citations. Electronic Data Sets to EPA. Reporting results Suite of standardized, detailed descriptions of emission calculation methods and results NEI.

18 Developing a Periodic Emissions Inventory for Ozone Precursors For additional information. Bob Downing MCAQD Emissions Inventory Unit Manager Web: (Select Emissions Inventory from nav menu) Maricopa County Air Quality Department

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