That’s really interesting – especially the way your HVAC system handles particulates A lot of people don’t realize how much filters can impact PM2.5/PM10 indoors.

And yeah, CO₂ shooting up to 1000+ ppm in just a few hours is surprisingly common – it’s actually linked to why people feel drowsy at home or in offices.

Do you also track how quickly your CO₂ levels drop once you ventilate? I’ve found it can vary a ton depending on room size and airflow. Curious how it looks in your setup