Is it water or the air, that turned this napkin red?

FictionalCharacter
So I live in a apartment building. That lately during sleep, my mouth is dry and my eyes burn. I keep thinking is dust or dry air or something. To which I’ve been cleaning 🧽 my room and furniture. Washing my curtains, and adding a humidifier.
Is it water or the air, that turned this napkin red?
I also put a glass container full of water under my bed. To add more moisture in the air. That I still had trouble sleeping with burning eyes and dry mouth.

I was changing the water from the glass container. I noticed mold or film dust particles in the water. I drained it and wiped the glass, that the napkin got red/pink stains.

Why?
What should I do?
Is it the air or AC or the water?
Updates:
8 d
Thanks for the answers. I have a list to go to the hardware store to buy a new allergy free air filter and air purifier.
Is it water or the air, that turned this napkin red?
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