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Implementation of Regional Land Cover-specific Non-Methane Organic Gas Emission Factors and Speciation in NEI Wildland Fire Emissions Modeling Methods
Citation:
Beidler, J., K. Seltzer, H. Pye, K. Baker, J. Vukovich, G. Pouliot, AND V. Rao. Implementation of Regional Land Cover-specific Non-Methane Organic Gas Emission Factors and Speciation in NEI Wildland Fire Emissions Modeling Methods. Emissions Inventory Conference 2025, RTP, NC, September 15 - 18, 2025.
Impact/Purpose:
This presentation is to describe the work to improve the characterization of total reactive organic compounds in the national emissions inventory from a large source, wildland fires.
Description:
While anthropogenic emissions have declined in the conterminous United States, emissions from wildland fires have increased. Wildland fire emissions result in large emissions of particulate matter; and, they are also a significant source of many emissions in the gas-phase. Non-methane organic gases (NMOGs) include all non-methane gas phase organic compounds, which includes hazardous air pollutants. For many years, the National Emissions Inventory has shown that wildland fires are the second largest source of volatile organic compounds (VOCs) behind biogenic sources and above all anthropogenic sectors. Recent evaluations of modeled reactive organic carbon (ROC), including both the gas and particle phase, found that the total mass was lower than field measurements. We present the implementation of regional and land cover-specific NMOG emission factors into the EPA’s wildland fire emissions estimate method. This method update includes the addition of new source category codes to support regional and land-cover specific NMOG speciation and a general increase in emissions to account for previously neglected, unidentified mass.
