Variable Experiment Site   Leyendecker Columbus Deming Anthony Bolson La Teja Palomas PM2.5 T1 0.978dz 2.195d 8.329b 1.768d 5.584c 7.617b 15.615a PM2.5 T5 0.435de 0.124e 2.373cd 0.506de 4.499b 4.27bc 12.189a PM2.5 T10 0.277b 0.073b 0.848b 0.250b 1.041b 0.744b 6.063a PM2.5 T15 0.139b 0.047b 0.346b 0.154b 0.269b 0.459b 3.215a PM2.5 T20 0.099b 0.033b 0.201b 0.103b 0.125b 0.549b 1.998a PM2.5 T25 0.059b 0.026b 0.123b 0.074b 0.124b 0.275b 1.265a PM2.5 T30 0.063a 0.023a 0.085a 0.069a 0.058a 0.264a 0.00a PM2.5 Total 2.052c 2.522c 12.31b 1.925c 11.7b 13.86b 40.34a zMeans with the same letter are not significantly different (LSD mean) at the 0.05 level of significance

Table 7: Average particulate matter (PM2.5) (mg/m3) detected by the DustTrak at 1 to 30 seconds after 10 passes of the vehicle in front of the instrument.