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Photographic gallery.  Thousands of particles under the microscope.
PM2.5 Particles

PM2.5 Particles

This is one view of PM2.5 particles on a Teflon air filter. With the red plate the crystals can be seen to have a positive sign of elongation.

Transmitted Linear Polarized Light with the Red Plate


Significance in the Environment:

Characteristic Features:

Associated Particles: