AQI Detail Page
AQI 500: cigarette equivalent, interpretation, and what to do next
At AQI 500, a full day of exposure is roughly equivalent to smoking 22.75 cigarettes.
AQI category
Hazardous
PM2.5 estimate
500.5
µg/m³
Daily equivalent
22.75
cigarettes / 24h
If repeated daily
682.5
cigarettes / 30 days
What AQI 500 means
Avoid outdoor exposure unless it is essential, and use layered indoor protection.
People with breathing or heart problems may need professional medical advice if symptoms worsen.
Exposure framing
1 hour: about 0.95 cigarettes.
2 hours: about 1.9 cigarettes.
24 hours: about 22.75 cigarettes.
7 repeated days: about 159.3 cigarettes.
Scenario guidance at AQI 500
These are the kinds of day-to-day decisions users commonly make from this reading.
Commute or errands
Avoid2 hours equals 1.9 cigarettes at AQI 500.
Delay nonessential errands and consolidate unavoidable travel.
Outdoor exercise
Avoid1 hour equals 0.95 cigarettes at AQI 500.
Skip outdoor exercise and wait for cleaner air.
Kids, school, or playground time
Avoid3 hours equals 2.84 cigarettes at AQI 500.
Keep children inside and use the cleanest indoor space you can maintain.
Sleeping with windows open
Avoid8 hours equals 7.58 cigarettes at AQI 500.
Seal the room as much as possible and run filtration continuously.
Why the estimate is credible
The site first converts AQI into an estimated PM2.5 concentration and then applies Berkeley Earth's cigarette-equivalence framing.
The estimate is most useful for comparing air-quality dose across times, situations, and repeated days. It should not be treated as a literal smoking-equivalence medical claim.
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