1. Your home has too much moisture
2. You’re vacuuming without a HEPA filter
3. You’re forgetting to change the vacuum filter
4. You’re not cleaning vents and ducts
5. Your bathroom has poor ventilation
6. You’re using the wrong household cleaners
7. You’re not dusting correctly
8. You’re ignoring your gutters
9. Your bedroom is musty
10. You wear your shoes inside the house
11. You’re surrounded by wind-pollinated plants
12. You have too much stuff
13. You let your pet sleep in your bed

For more details: https://www.rd.com/home/cleaning-organizing/signs-home-unhealthy/