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. Author manuscript; available in PMC: 2016 Feb 4.
Published in final edited form as: J Air Waste Manag Assoc. 2015 Mar;65(3):287–297. doi: 10.1080/10962247.2014.982307

Table 1.

Source contributions to fine particle mass and elemental concentrations (ng/m3) at Harvard Supersite.

Regional Pollution Motor Vehicles Sea Salt Crustal/Road Dust Oil Combustion Wood Burning Estimate Measured %MRE
BC 105 350 1 3 81 43 583 658 12
Na 69 0 18 5 30 21 174 195 11
Al 9 7 0 29 1 1 47 47 1
Si 3 12 0 52 0 0 67 67 0
S 729 151 2 10 66 12 971 980 1
Cl 0 1 14 0 0 0 15 15 2
K 6 0 1 7 0 23 37 37 0
Ca 1 9 1 13 4 1 28 29 3
Ti 0 1 0 1 0 0 3 3 0
V 0 0 0 0 3 0 3 3 1
Fe 0 37 0 17 6 0 61 61 1
Ni 0 0 0 0 2 0 2 3 2
Cu 0 2 0 1 0 1 3 4 8
Zn 0 5 0 0 2 3 10 11 9
Pb 1 1 0 1 1 1 5 5 9
PM2.5 4,220 1,836 48 383 663 1,648 8,798 9,353 6