Table 3:

Anthropogenic emissions of trace metals over North America in the standard simulation with halved anthropogenic fugitive dust (AFD) emissions for crustal elements in the U.S. and a fivefold increase in As and Pb emissions as discussed in the main text.

	Anthropogenic emissions		U.S. sectoral fractions in anthropogenic emissions (%)
	US (Gg)	Canada (Gg)	AFD	Industry	Transportation	Power plants	Residential combustion	Agricultural fires
Si	124	51	63	24	2	12	< 1	< 1
K	45	7	17	59	< 1	2	7	14
Al	42	17	65	12	1	22	< 1	< 1
Ca	35	10	59	19	4	18	< 1	< 1
Fe	32	13	62	14	9	14	< 1	< 1
Mg	4.8	0.6	33	22	41	2	1	2
Ti	4.1	0.8	43	37	2	17	< 1	< 1
Mn	0.9	0.2	56	36	3	5	< 1	< 1
Pb	1.7	3.6E-02	-	-	-	-	-	-
As	0.31	1.6E-03	-	-	-	-	-	-
Ni	0.27	2.0E-03	-	-	-	-	-	-
Cd	0.016	6.4E-04	-	-	-	-	-	-