This paper presents the first National Emissions Inventory (NEI) of fine particulate matter (PM 2.5 ) that includes the full suite of PM 2.5 trace elements (atomic number >10) measured at ambient monitoring sites across the U.S. PM 2.5 emissions in the NEI were organized and aggregated into a set of 84 source categories for which chemical speciation profiles are available (e.g., Unpaved Road Dust, Agricultural Soil, Wildfires). Emission estimates for ten metals classified as Hazardous Air Pollutants (HAP) were refined using data from a recent HAP NEI. All emissions were spatially gridded, and U.S. emissions maps for dozens of trace elements (e.g., Fe, Ti) are presented for the first time. Nationally, the trace elements emitted in the highest quantities are silicon (3.8 × 10 5 ton/yr), aluminum (1.4 × 10 5 ton/yr), and calcium (1.3 × 10 5 ton/yr). Our chemical characterization of the PM 2.5 inventory shows that most of the previously unspeciated emissions are comprised of crustal elements, potassium, sodium, chlorine, and metalbound oxygen. This work also reveals that the largest PM 2.5 sources lacking specific speciation data are off-road dieselpoweredmobileequipment,roadconstructiondust,marinevessels, gasoline-powered boats, and railroad locomotives.

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