AQI Detail Page
AQI 250: Berkeley Earth comparison and what to do next
Berkeley Earth's rough population health-impact comparison: ≈ 7.95 cigarette-equivalents if PM2.5 at AQI 250 persisted for 24 hours. This is risk communication, not particle mass, inhaled dose, cigarettes smoked, personal risk, or diagnosis.
AQI category
Very Unhealthy
PM2.5 estimate
174.9
µg/m³
Berkeley Earth comparison
7.95
Berkeley Earth cigarette-equivalents / 24h
30-day repeated comparison
238.5
Berkeley Earth cigarette-equivalents / 30 repeated days
What AQI 250 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.
Berkeley Earth risk-communication comparison
1 hour: Berkeley Earth comparison ≈ 0.33 cigarette-equivalents.
2 hours: Berkeley Earth comparison ≈ 0.66 cigarette-equivalents.
24 hours: Berkeley Earth comparison ≈ 7.95 cigarette-equivalents.
7 repeated days: Berkeley Earth comparison ≈ 55.6 cigarette-equivalents.
Scenario guidance at AQI 250
These are the kinds of day-to-day decisions users commonly make from this reading.
Commute or errands
Avoid2 hours at AQI 250: Berkeley Earth comparison ≈ 0.66 cigarette-equivalents.
Delay nonessential errands and consolidate unavoidable travel.
Outdoor exercise
Avoid1 hour at AQI 250: Berkeley Earth comparison ≈ 0.33 cigarette-equivalents.
Skip outdoor exercise and wait for cleaner air.
Kids, school, or playground time
Avoid3 hours at AQI 250: Berkeley Earth comparison ≈ 0.99 cigarette-equivalents.
Keep children inside and use the cleanest indoor space you can maintain.
Sleeping with windows open
Avoid8 hours at AQI 250: Berkeley Earth comparison ≈ 2.65 cigarette-equivalents.
Seal the room as much as possible and run filtration continuously.
Explore nearby readings
Related AQI Berkeley Earth comparisons
Open a nearby or commonly searched AQI value to see how estimated PM2.5 concentration, Berkeley Earth's rough population health-impact comparison, and action guidance change.
Why the estimate is credible
The site first converts a PM2.5 pollutant AQI into an estimated concentration, then applies Berkeley Earth's rough population health-impact comparison.
The result is for risk communication—not particle mass, inhaled dose, cigarettes actually smoked, personal risk, or diagnosis.
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