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Table 1 Summary of concentrations and characteristics of the diesel exhaust particles and gases within the animal exposure chambers.a

From: Role of oxidative stress on diesel-enhanced influenza infection in mice

Constituent Units Exposure
Particle mass concentration (TEOM) μg/m3 500 ± 9
Particle mass concentration (filter)b μg/m3 701 ± 16
Particle number concentrationc #/cm3 1.0 × 108
± 4.7 × 106
Oxygen (O2) % 19.7 ± 0.5
Carbon monoxide (CO) ppm 12.0 ± 1.0
Nitrogen oxides (NOx) ppm 17.6 ± 0.7
Sulfur dioxide (SO2) ppm >3.0
Number median Dpd nm 53 ± 2
Volume median Dpd nm 194 ± 2
OC/ECe wt ratio 1.1 ± 0.1
  1. aThese data represent averaged results from the two repeat studies performed from 8/1-13/06 (13 days), 10/2-14/07 (13 days), and NAC study 2/11-19/08 (9 days). Tapered element oscillating microbalance (TEOM), O2, CO, and NOx data represent mean values from continuous measurements taken over all 35 exposure days ± SE.
  2. bFilter data represent mean values from one measurement per day taken over 34 days of exposure ± SE.
  3. cParticle number concentration data represent a mean value from 13 days of exposure ± SE.
  4. dDp indicates particle geometric number and volume median diameters for 13 days of particle size distribution measurements ± geometric standard deviation. Note that volume information is calculated from number based mobility diameters and assume spherical particles.
  5. eOC/EC (organic carbon to elemental carbon ratio) data represent mean values from one measurement per day taken over 13 days of exposure ± SE.