AQI Detail Page

AQI 25: Berkeley Earth comparison and what to do next

Berkeley Earth's rough population health-impact comparison: ≈ 0.2 cigarette-equivalents if PM2.5 at AQI 25 persisted for 24 hours. This is risk communication, not particle mass, inhaled dose, cigarettes smoked, personal risk, or diagnosis.

Open AQI 25 in the calculatorCompare with AQI 150

AQI category

Good

PM2.5 estimate

4.5

µg/m³

Berkeley Earth comparison

0.2

Berkeley Earth cigarette-equivalents / 24h

30-day repeated comparison

6

Berkeley Earth cigarette-equivalents / 30 repeated days

What AQI 25 means

Short outdoor activity is generally low risk when AQI stays in this range.

People with asthma or smoke sensitivity should still watch for symptoms if the air smells smoky.

Proceed with normal outdoor activity.
Use the day to ventilate and prepare before worse conditions arrive.
Check tomorrow's forecast if wildfire smoke or inversion is developing.

Berkeley Earth risk-communication comparison

1 hour: Berkeley Earth comparison ≈ 0.01 cigarette-equivalents.

2 hours: Berkeley Earth comparison ≈ 0.02 cigarette-equivalents.

24 hours: Berkeley Earth comparison ≈ 0.2 cigarette-equivalents.

7 repeated days: Berkeley Earth comparison ≈ 1.4 cigarette-equivalents.

Scenario guidance at AQI 25

These are the kinds of day-to-day decisions users commonly make from this reading.

Browse all scenarios

Commute or errands

Good to go

2 hours at AQI 25: Berkeley Earth comparison ≈ 0.02 cigarette-equivalents.

A short outdoor trip is usually manageable, but keep an eye on trends.

Outdoor exercise

Good to go

1 hour at AQI 25: Berkeley Earth comparison ≈ 0.01 cigarette-equivalents.

Most people can train outdoors normally.

Kids, school, or playground time

Good to go

3 hours at AQI 25: Berkeley Earth comparison ≈ 0.03 cigarette-equivalents.

Normal play is usually fine if children are not symptomatic.

Sleeping with windows open

Good to go

8 hours at AQI 25: Berkeley Earth comparison ≈ 0.07 cigarette-equivalents.

Ventilation is usually acceptable if the air stays in this range.

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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.

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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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