Atmospheric Nanoparticles - Environmental and Human Health Impacts of Nanotechnology - page 198

for the reconciliation of the variability encountered between measurements from
various laboratories for both exhaust and non-exhaust nanoparticle emissions. A
better knowledge of atmospheric NPs will also help the understanding of their
health effects and their atmospheric fate.
Because of very small size and the fact that the smallest mainly comprise semi-
volatile material, atmospheric NPs behave differently to larger atmospheric parti-
cles. They have a shorter lifetime and measurements show strong spatial and
temporal variability of their concentrations. Their formation in the atmosphere may
depend on meteorological parameters and this leads to diffi culty in quantifying
emission sources. They may be involved partially or totally in gas- particle equilibria
depending on atmospheric characteristics (concentration, temperature, etc.) and
this may have implications for human exposure.

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