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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 bright particles are secondary salts that have grown in the filter during collection. They are primarily ammonium sulfate. The black particles are from coal dust, charred wood, natural minerals, and other combustion products.

Transmitted Circular Polarized Light Illumination


Significance in the Environment:

Characteristic Features:

Associated Particles: