Set up your profile

Weight

kg

Enter 30 to 200 kg.

Sex (for breathing model)

Male Female

Age

Under 60 60+

Conditions Asthma COPD Heart condition

Location

Air purifier at home

Yes No

Stored only on this phone.

µg/m³ PM2.5

Indoor air estimated without a purifier.

µg/m³

Indoor estimate

Forecast, not a live reading. Not medical advice.

How we calculate

Air: Hourly PM2.5 forecasts from Google. Forecasts are estimates.
Breathing: Estimated from the exercise's MET value, your weight and sex, using a US EPA breathing model.
Dose: PM2.5 × air breathed × minutes.
Limit: Based on published risk-benefit research, stricter for 60+ and listed conditions.

These are estimates for planning, not medical advice.