AirNow city lookup
Live city AQI with a Berkeley Earth PM2.5 comparison
Select a supported city to inspect the reporting-area reading and forecast. Static baselines, partial responses, and non-PM2.5 readings are never presented as a live Berkeley Earth comparison.
Data status
Planning baseline only
The live API was unavailable, rate-limited, or returned no usable data. The planning baseline is shown separately and is not a current reading.
Static planning baseline
AQI 105
The number below is a city planning baseline, not a current observation. No live Berkeley Earth comparison is calculated from it.
Berkeley Earth comparison (if this PM2.5 level persisted for 24 hours)
The number below is a city planning baseline, not a current observation. No live Berkeley Earth comparison is calculated from it.
Forecast
No live forecast is available for this request.
API adapter details
The default AirNow latitude/longitude endpoints are scheduled for retirement in fall 2026. The server adapter supports replacement URLs through AIRNOW_OBSERVATION_ENDPOINT and AIRNOW_FORECAST_ENDPOINT.
Request generated: Oct 22, 2026, 8:06 PM UTC
What “live” means here
AirNow current values are reporting-area NowCast readings, not a sensor at your exact GPS point.
The API returns pollutant-specific observations. A comparison is shown only when the selected current observation is PM2.5.
The 24-hour result is Berkeley Earth's rough population health-impact comparison under a persistence assumption; it is not particle mass, inhaled dose, cigarettes smoked, personal risk, or diagnosis.
Observation and forecast requests fail independently, so one useful result remains visible when the other source is unavailable.
Trust Signals
Live-data limitations and sources
Review policy
August 8, 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.
Live AQI questions
Why do I see a planning baseline instead of live data?
AirNow may not cover the country, the server key may not be configured, or the API may be unavailable. Baselines are labeled and are not used as current readings.
Why is the Berkeley Earth comparison disabled for ozone?
The comparison starts from confirmed PM2.5 mass concentration. Ozone is a gas, so the Berkeley Earth PM2.5 framework does not apply.
Is the reading exactly at my location?
No. The AirNow current endpoint returns a reporting-area NowCast selected near the city coordinates.