Particulate matter components and subclinical atherosclerosis: common approaches to estimating exposure in a Multi-Ethnic Study of Atherosclerosis cross-sectional study

Table 2 PM _2.5 and PM _2.5 component annual average concentrations (μg/m ³ ) by area and MESA Air monitor

City	Monitor*	Type	PM_2.5**	EC**	OC**	Silicon	Sulfur
LA County	L001	non-roadside	16.3	2.0	2.6	0.15	1.18
	L002	roadside	16.8	2.1	2.4	0.16	1.22
	LC001	non-roadside	13.4	1.5	1.6	0.13	1.20
	LC002	non-roadside	15.3	1.6	2.2	0.14	1.23
	LC003	roadside	13.3	1.4	1.4	0.12	1.18
Chicago	C001	non-roadside	12.2	1.2	1.7	0.10	1.13
	C002	non-roadside	13.7	1.3	1.8	0.13	1.19
	C004	non-roadside	14.6	1.6	2.0	0.10	1.31
	C006	non-roadside	13.8	1.3	1.8	0.12	1.26
	C007	roadside	15.5	1.7	2.1	0.12	1.30
Baltimore	B001	roadside	15.6	2.1	2.4	0.11	1.69
	B003	non-roadside	14.7	1.4	2.3	0.09	1.69
	B004	non-roadside	13.9	1.4	2.1	0.08	1.67
	B005	non-roadside	12.7	1.0	1.9	0.07	1.53
St. Paul	S001	roadside	11.0	1.1	1.9	0.12	0.87
	S002	non-roadside	10.2	0.7	1.6	0.11	0.85
	S003	non-roadside	10.5	0.8	1.7	0.11	0.83
NY	N001	non-roadside	13.2	2.3	1.9	0.11	1.46
	N002	roadside	15.4	3.0	1.9	0.15	1.36
Forsyth County	W001	non-roadside	13.2	1.5	2.6	0.09	1.62
(Winston-Salem)	W002	non-roadside	13.2	1.1	2.5	0.10	1.59
	W003	roadside	13.9	1.2	2.6	0.10	1.66
	W004	non-roadside	13.0	1.0	2.4	0.09	1.67

* May 2, 2007 – Apr 16, 2008, see Figure 1.
**PM_2.5, particulate matter less than or equal to 2.5 μm in aerodynamic diameter; EC, elemental carbon; OC, organic carbon.

ISSN: 1476-069X