Morphology of deposited particles
Morphology and chemical composition of particle can help
to know their sources. Micrographs of the different particles
deposited on the filters are shown in Fig. 5 along with
their sizes. From Fig. 5a–i, it can be inferred that the
particles are rectangle, cubes, capsule, rough rectangle and
spherical and an agglomerates types. In general, according
to morphology it can be divided in two categories; particles
of natural origin (soil dust or minerals) and anthropogenic
origin. Morphology of natural origin are solid and having
irregular shapes (Buseck et al. 2000) and mostly dependent
on mineral habits, its composition, lifetime and transportation
in atmosphere. Particles produced from the combustion
processes are both solid and liquid particles with
the variable morphologies; in general, particles with
spherical shape are the result of the secondary reactions (Li
and Shao 2009b) while irregular particles in the fine range
result from coagulation processes (Breed et al. 2002). This
type of particles occurs as individual particle as well as in
aggregated form numerously in the current study.