Determining When to Change Your HEPA Filter

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:


    Nerd Corner

    Dive into what factors affect your HEPA filter’s lifespan and the details on how often you should change your HEPA filter.

    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.

    Smart Air is a social enterprise that creates simple, no-nonsense air purifiers and provides free education to protect people’s health from the effects of air pollution. We are proud to be the only certified B-Corp dedicated to fighting air pollution.