Indoor air quality means different things to different people. There are so many chemicals and particles that qualify as air 'pollution' that I find it helpful

Indoor air quality means different things to different people. There are so many chemicals and particles that qualify as air 'pollution' that I find it helpful to rank how important they are. This article does a good job of quantifying the damage by pollutant, using a metric called 'Disability Adjusted Life Years': https://www.energyvanguard.com/blog/which-indoor-air-pollutants-matter-most https://www.energyvanguard.com/blog/which-indoor-air-polluta... You can see that while there are a lot of things to consider, PM2.5 is by far the most dangerous. Surprisingly to me, mold is actually the next most dangerous, implying that indoor humidity control is also very important.