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Table 1 Results from transmission electron microscopy. The semi quantitative amounts of carbon aggregates and mineral particles (see text) and mean values with standard deviations for the geometric diameters of primary particles.

From: Physicochemical characterisation of combustion particles from vehicle exhaust and residential wood smoke

Sample Carbon aggregates Mineral particles Mean diameter (nm)
Tunnel St+ + ++ 25 ± 7
Tunnel St- ++ + 24 ± 6
Wood +++ - 31 ± 7 *
Diesel +++ - 24 ± 7
  1. * Significantly higher mean value