Ventilation

Ventilation is the movement of outdoor air into a building or space through open windows, doors, air moving systems or by infiltration.

 

This is important since indoor air is usually more polluted than outdoor air.

Ventilation is one of the three best ways to enhance or protect indoor air quality:

• The first is to capture contaminants at the source before they become airborne.
  
  
• The second is ventilation.
  
  
• The third is cleaning the air.

 

Reference: U.S. Environmental Protection Agency