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Table 2 Mean Day 1 pollutant physicochemical parameters during the four exposure scenarios

From: Diesel exhaust modulates ozone-induced lung function decrements in healthy human volunteers

Parameter Air O3 DE DE + O3
PM (μg/m 3 ) a 1.0 ± 1.5 1.0 ± 1.1 297. 1 ± 20.8 294.3 ± 20.1
PM # (x10 3 /cc) <1 <1 731 ± 90b (11) 734 ± 50b (11)
    977 ± 55c (4) 903 ± 306c (4)
Median PM size     
Volume (μm) ----- ----- 0.200 ± 0.007 0.200 ± 0.007
Number (μm) d ----- ----- 0.064 ± 0.006 0.066 ± 0.003
O 3 ppm 0.00 ± 0.00 0.30 ± 0.00 0.01 ± 0.00 0.30 ± 0.00
CO (ppm) 0.09 ± 0.10 0.09 ± 0.10 2.58 ± 0.25 2.51 ± 0.32
NO (ppm) 0.00 ± 0.01 0.01 ± 0.03 1.58 ± 0.26 0.03 ± 0.04
NO2 (ppm) 0.00 ± 0.00 0.00 ± 0.00 0.16 ± 0.05 1.72 ± 0.22
THC (ppm) 2.05 ± 0.10 1.98 ± 0.10 2.35 ± 0.14 2.24 ± 0.19
SO2 (ppm) <0.010 <0.010 0.013 <0.010
  1. mean ± Std Dev except for Median PM size; n = 15, except for PM# where n is indicated.
  2. aGravimetric weight; average of two teflon filters.
  3. bCPC Model TSI 3022A.
  4. cCPC Model TSI 3775.
  5. dparticle size (μm) bin where the median of the particle counts occurred.