PM2.5 Particles

This is one view of PM2.5 particles on a glass transfer slide. This filter section was washed with water/isopropyl alcohol 9:1 so the secondary salts have been washed away. The wet filter was placed on a microscope coverslip and as it dried some of the particles were transfered to the coverslip. These art the transfered particles away from the Teflon filter. With off crossed polarized light the flyash particles appear as circular particles. The irregular particles are natural minerals.