How does outdoor air quality impact indoor air quality?

Outdoor air quality significantly impacts indoor air quality because pollutants from the outdoor environment can infiltrate indoor spaces, leading to increased levels of harmful substances inside buildings. Various factors contribute to this infiltration, such as open windows, doors, and ventilation systems that draw in outside air. When outdoor air quality is poor, particularly during events like smog, wildfires, or construction activities, the concentration of pollutants, such as particulate matter, volatile organic compounds, and other contaminants, can rise indoors.

While fresh outdoor air can help dilute indoor pollutants, an increase in outdoor contaminants can exacerbate indoor air quality issues, particularly in areas where ventilation systems are not designed to filter out such pollutants effectively. This dynamic illustrates why maintaining good outdoor air quality is crucial for ensuring healthier indoor environments for occupants.