Originally Posted by
CVividasku
You are certainly more than right. At my airline, a group of pilots, cabin crew, joined together and created a whatsapp group to share all technical information regarding cabin air quality.
They noticed that the filters were not changed regularly enough at all, and removed some panels to see them on many planes, they generally saw them completely obstructed by dust.
Cleaning the filters should be part of the Maintenance Schedule and called up on a regular basis, it certainly was on the airline I worked for. Plus, what are pilots and cabin crew doing removing panels and did you record your actions in the appropriate log.