Daily exposure planner
Build your day from the air you actually breathed
Add the places and activities that made up your day. The planner combines AQI and PM2.5 readings without pretending the result is a medical dose.
Map the places in your day
Use a PM2.5-specific AQI or a direct PM2.5 reading for every segment.
Your recorded day
Recorded time
23 h
Time-weighted PM2.5
17.4 µg/m³
Particulate comparison
≈ 0.76 cigarettes
Largest contributor
Work or school
Contribution breakdown
Where a change matters most
Work or school contributes the largest share. Improving that segment first would have the biggest effect on this recorded-day comparison.
This is an ambient particulate comparison, not cigarettes actually smoked, an inhaled dose, or medical advice.
How the daily comparison works
- AQI entries are first converted to estimated PM2.5 with the site’s reviewed EPA breakpoint logic.
- Each concentration is multiplied by time, then combined into a time-weighted PM2.5 average.
- The particulate comparison uses the same Berkeley Earth framing as the main calculator.
- The result describes the hours entered; it is not an inhaled dose or a medical risk prediction.
Trust Signals
How to interpret a multi-place day
Review policy
July 20, 2026. We update supporting pages when calculator logic, live data behavior, or source framing changes.
Primary sources
AQI uses EPA / AirNow breakpoint logic. Cigarette-equivalent framing follows Berkeley Earth’s PM2.5 interpretation.
Live data layer
City pages use EPA AirNow where supported, with cached fallbacks and planning baselines if the API fails or coverage is unavailable.
Daily exposure planner questions
Can I mix AQI and PM2.5 readings?
Yes. AQI entries must specifically represent PM2.5; the tool converts them before combining every segment in one particle-hour calculation.
Why can the total be less than 24 hours?
You may only know part of your day. Results cover the recorded hours and do not invent values for missing time.
Is this my inhaled dose?
No. Actual dose depends on breathing rate, building filtration, masks and personal physiology. This is an ambient-exposure comparison.