system
A chat on subreddit /r/pcmasterrace
human
You should be ashamed. 

For the love of god, get an air purifier or something. Or a dehumidifier. Anything. Your air is disgustingly filthy

All of that brown and black shit means there are high amounts of dirt and contaminants in your air. 

Normal dust accumulation should be grey-light grey.
gpt
I live in the desert and it gets extremely dusty in my room. I have to clean out my PC's every two to three weeks to keep it from building up.

I recently ordered an air purifier to help with the white dust particles so hopefully it will help keep it under control.