Table III.

Particle types and its description about cause of toxicity

Particle type	Description
P10 and P2.5	The mass fraction of the particle with average diameter 10 and 2.5 μm, respectively
Ultrafine particles	The fraction of P10 in size ranges 0.1 μm and contains primary particle as well as agglomerate of size 100 nm
Coarse particles	The size of such particle is 2.5 μm and they are mass fraction of particle P10
PSP	Low specific toxicity and less soluble, it is fine or ultrafine particle
DEP	Diesel exhaust particles
CDNP	Diesel exhaust particles are combustion-derived nanoparticles

PSP: polyamide seeding particle