close-up of a dirty air filter covered in dust and debris, needs cleaning and maintenance.

dust filter dirty closeup debris air maintenance cleaning pollution contamination hvac allergy particles health equipment dustmites interior ventilation unclean dusting environment texture hygiene buildup airquality dirt mold protection filtermaintenance macro system mesh airvent repair household freshness grime fabric unhealthy indoor clogged filtration purify dustcontrol filterclean airflow detail ai generated