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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. The black particles are from coal dust, charred wood, natural minerals, and other combustion products. The other particles don't show up well with this type of illumination.

Transmitted Oblique Illumination


Significance in the Environment:

Characteristic Features:

Associated Particles: