AQI Detail Page
AQI 280: cigarette equivalent, interpretation, and what to do next
At AQI 280, a full day of exposure is roughly equivalent to smoking 9.33 cigarettes.
AQI category
Very Unhealthy
PM2.5 estimate
205.2
µg/m³
Daily equivalent
9.33
cigarettes / 24h
If repeated daily
279.9
cigarettes / 30 days
What AQI 280 means
Even brief exposure can be irritating, and repeated exposure adds up quickly.
People with cardiopulmonary disease may need a much stricter stay-inside plan.
Exposure framing
1 hour: about 0.39 cigarettes.
2 hours: about 0.78 cigarettes.
24 hours: about 9.33 cigarettes.
7 repeated days: about 65.3 cigarettes.
Scenario guidance at AQI 280
These are the kinds of day-to-day decisions users commonly make from this reading.
Commute or errands
Avoid2 hours equals 0.78 cigarettes at AQI 280.
Delay nonessential errands and consolidate unavoidable travel.
Outdoor exercise
Avoid1 hour equals 0.39 cigarettes at AQI 280.
Skip outdoor exercise and wait for cleaner air.
Kids, school, or playground time
Avoid3 hours equals 1.17 cigarettes at AQI 280.
Keep children inside and use the cleanest indoor space you can maintain.
Sleeping with windows open
Avoid8 hours equals 3.11 cigarettes at AQI 280.
Seal the room as much as possible and run filtration continuously.
Explore nearby readings
Related AQI cigarette equivalents
Open a nearby or commonly searched AQI value to see how particle dose, cigarette-equivalent exposure, and action guidance change.
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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