Skip to main content

Table 1 Pollutant concentrations in the exposure chamber during exposure to filtered air, as well as filtered and unfiltered diesel exhaust challenges

From: Assessment of the capacity of vehicle cabin air inlet filters to reduce diesel exhaust-induced symptoms in human volunteers

Exhaust component Filtered air (n = 30) Unfiltered DE (28) Diesel exhaust filter A (n = 29) Diesel exhaust filter B (n = 28)
PM1 (μg/m3) 4.6 ± 1.7 350 ± 72 183 ± 18*** 93 ± 16***
Particle number x 105/cm3 n/a 54 ± 10 30 ± 6* 15 ± 3**
NO (ppm) 0.00 ± 0.00 2.49 ± 1.01 2.21 ± 0.66 1.77 ± 0.55**
NO2 (ppm) 0.00 ± 0.00 0.68 ± 0.29 0.58 ± 0.20 0.10 ± 0.04***
Hydrocarbons (ppm) 0.00 ± 0.00 2.41 ± 0.81 1.85 ± 0.60* 1.02 ± 0.11***
  1. Data are given as mean ± SD. T-tests were performed to analyze differences in pollutant concentrations between unfiltered DE and DE exhaust after the use of the cabin filters. P values of < 0.05 were considered significant: *P < 0.05, **P < 0.01, ***P < 0.001.