Is Indoor Air Quality Worse Than Outdoor Air?

Indoor Air Quality | Orange County, CA

Expert answer to "Is Indoor Air Quality Worse Than Outdoor Air?" — backed by EPA, DOE, and ASHRAE data. From Breezy Air Services, Orange County's diagnostic-first HVAC company.

## Is Indoor Air Quality Worse Than Outdoor Air? Yes. According to the EPA, indoor air is typically 2 to 5 times more polluted than outdoor air — and in some cases up to 100 times worse. This is because modern homes are sealed tightly for energy efficiency, trapping pollutants from cooking, cleaning products, building materials, and your HVAC system itself. The average American spends approximately 90% of their time indoors, making indoor air quality a more significant health factor than most p...

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