Emissions inventory of PM2.5 trace elements across the United States.
This paper presents the first National Emissions Inventory (NEI) of fine particulate matter (PM2.5) that includes the full suite of PM2.5 trace elements (atomic number > 10) measured at ambient monitoring sites across the U.S. PM2.5 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 x 10(5) ton/yr), aluminum (1.4 x 10(5) ton/yr), and calcium (1.3 x 10(5) ton/yr). Our chemical characterization of the PM2.5 inventory shows that most of the previously unspeciated emissions are comprised of crustal elements, potassium, sodium, chlorine, and metal-bound oxygen. This work also reveals that the largest PM2.5 sources lacking specific speciation data are off-road diesel-powered mobile equipment, road construction dust, marine vessels, gasoline-powered boats, and railroad locomotives.
Reff
Adam
A
U.S. Environmental Protection Agency, Research Triangle Park, North Carolina 27711, USA. reff.adam@epa.gov
Bhave
Prakash V
PV
Simon
Heather
H
Pace
Thompson G
TG
Pouliot
George A
GA
Mobley
J David
JD
Houyoux
Marc
M
D000393:Air Pollutants; D000535:Aluminum / Q000032:analysis; D002118:Calcium / Q000032:analysis; D004391:Dust; D004784:Environmental Monitoring / Q000379:methods*; D010316:Particle Size; D052638:Particulate Matter; D012825:Silicon / Q000032:analysis; D014131:Trace Elements / Q000032:analysis*; D014481:United States
D000393:Air Pollutants; D004391:Dust; D052638:Particulate Matter; D014131:Trace Elements; D000535:Aluminum; D002118:Calcium; D012825:Silicon