indoor air quality 4

https://astro-wiki.win/index.php/Key_Factors_to_Consider_Before_a_Furnace_Installation

Indoor air quality is something I never thought about until I started waking up with a stuffy nose and headaches. After getting a monitor, I realized the CO2 levels in my home office were through the roof during the day. Opening a window for just five minutes made a huge difference, and now I pay attention to humidity and dust more than ever.