Use this simple tool to determine how often you need to replace or your air purifier’s HEPA filter. It just takes 3 simple steps:
How this Calculator Works
This calculator uses air pollution data from the World Health Organization to calculate the approximate time a HEPA filter will last in a specific country or region [source]. A HEPA filter is deemed in need of replacing once the its effectiveness at providing clean air has dropped to 50% of its initial value.