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Table 3 Oxidative potential (OP) of road tunnel PM

From: Road tunnel-derived coarse, fine and ultrafine particulate matter: physical and chemical characterization and pro-inflammatory responses in human bronchial epithelial cells

Sample name (PM) Size fraction OPDTT (nmol DTT/ng*min) OPESR (arbitrary units)
Marienborg dry conditions Coarse 0.063 63,823
Fine 0.068 78,288
Ultrafine 0.007 24,389
Marienborg humid conditions Coarse 0.070 73,555
Fine 0.060 76,634
Ultrafine 0.011 24,409
Hell dry conditions Coarse 0.038 30,161
Fine 0.043 37,216
Ultrafine 0.013 13,035
Hell humid conditions Coarse 0.026 32,764
Fine 0.054 56,771
Ultrafine 0.005 9330
Marienborg after cleaning humid conditions Coarse 0.071 68,176
Fine 0.062 69,284
Ultrafine 0.010 26,630
Hell after cleaning dry conditions Coarse 0.015 16,979
Fine 0.043 39,594
Ultrafine 0.026 24,184
  1. Acellular ROS formation was determined by the dithiothreitol (DTT)-method and electron spin resonance (ESR)-method for the coarse, fine and ultrafine PM sampled from two tunnels during both humid and dry road surface conditions, and after road surface cleaning. For the DTT method the positive control was 0.1 and for the ESR the negative control was 2954, and the positive control was 54,119. The results are presented as the mean of three (OPERS) and two (OPDTT) measurements