HIGH DENSITY AIR FILTERATION (HEPA & CARBON) – DO I NEED IT?

After an exchange about hydroxyl air purifiers , Mike asks another question: "What is your opinion on purification units with HEPA and carbon filters versus the hydroxyl technology. I am reading a lot about fine particle pollution I.E dust and I notice that this (hydroxyl) technology does not eliminate the particles although it does appear to neutralize particles. Can you speak to this issue?"…