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. 2005 Mar 16;113(8):947–955. doi: 10.1289/ehp.7939

Figure 2.

Figure 2

Correlation between traffic density and measured total PN concentration, corrected for wind velocity, 30 m downwind from the freeway. Reprinted with permission from Zhu et al. (2002b). Copyright 2002 Air and Waste Management Association.