Country Site -------------- PM2.5 (mg m-3) ----------------     32km h-1 48km h-1 64km h-1 Mexico Bolson1 8.40z 12.4 18.0 Mexico La Teja2 5.37 12.4 17.8 Mexico Palomas3 22.7 23.9 37.1 USA Anthony4 1.87 2.37 5.03 USA Columbus5 3.05 3.56 6.71 USA Deming6 13.9 13.1 23.3 USA Leyendecker7 1.11 1.66 2.17 zn=300, difference between vehicle speeds: 1(e.g., 12.4-8.4 = 4; 4, 5.6); 2(7.03, 5.4); 3(1.2, 13.2), 4(0.5, 2.66); 5(0.51, 3.15), 6(-0.8,10.2), and 7(0.55, 0.51)

Table 4: Maximum concentrations of PM2.5 detected by the DustTrak for different vehicle speeds at seven experiment sites in the US and Mexico.