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Table 4 Elemental carbon (EC) and organic carbon (OC) levels, 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 OC (Hg/mg PM) EC (Hg/mg PM)
Marienborg, dry conditions Coarse 104 ± 13 0.3 ± 0.6
Fine 441 ± 110 4.3 ± 9.6
Ultrafine 431 ± 107 1.8 ± 1.3
Marienborg, humid conditions Coarse 157 ± 42 0.7 ± 0.8
Fine 575 ± 60 0.0 ± 0.0
Ultrafine 527 ± 38 119.8 ± 112.2
Hell, dry conditions Coarse 28 ± 10 0.0 ± 0.0
Fine 94 ± 37 0.0 ± 0.0
Ultrafine 131 ± 29 0.0 ± 0.0
Hell, humid conditions Coarse 98 ± 19 0.3 ± 0.5
Fine 485 ± 14 0.0 ± 0.0
Ultrafine 434 ± 32 3.2 ± 5.5
Marienborg, after cleaning humid conditions Coarse 144 ± 17 0.7 ± 0.6
Fine 483 ± 73 0.0 ± 0.0
Ultrafine 69 ± 23 0.3 ± 0.5
Hell, after cleaning dry conditions Coarse 55 ± 7 0.0 ± 0.0
Fine 76 ± 6 0.4 ± 0.6
Ultrafine 151 ± 29 2.6 ± 3.5
  1. The table includes the coarse, fine and ultrafine PM sampled from two road tunnels during both humid and dry road surface conditions, and after road surface cleaning. EC and OC levels were determined by thermal optical analysis as described in “Materials and methods”, and presented as µg/mg PM. The data represent the mean ± SEM of 3 analyses