- Always use gloves when handling filters.
- Place filter in sampler with the ID side facing down.
- After sampling, fold filter with the deposit side facing in.
Quartz filters have a front and back side. The back side is the side that looks like it has a grid on it. The ID is always stamped on the back side. The deposit should be collected on the “rough” side.
You can find more information in the EPA Quality Assurance Handbook, Vol. II, Part II 2.11–PM10 High Volume.