Free Tools

Interactive calculators and guides to help you breathe cleaner air

Clean Air Challenge

Arcade game — dodge pollution, catch clean air particles. How long can you survive?

Type any AQI number and see what it means for your health in plain English.

Interactive timer with 4-7-8, Box Breathing, and Coherent Breathing modes.

Calculate the minimum CADR your air purifier needs based on room size.

Calculate the real cost of an air purifier including filters and electricity.

How long does your filter last? Calculate lifespan, replacement cost, and find the best deals. 65+ models.

Estimate how often you need to clean your air purifier based on usage.

Compare air purifier noise levels to everyday sounds you know.

Enter room dimensions and get the minimum CADR you need based on AHAM standards.

Answer a few questions to find the perfect air purifier for your needs.