Evidence-backed facts
- AirNow web services expose current observations, forecasts, reporting areas, and historical files for air-quality index and pollutant information. informative
- Requests use a registered API key that must remain outside public artifacts; access does not grant monitor operation, forecast publication, emergency, or regulatory authority. informative
- Clients must bind geographic or station scope, distance, date and time, pollutant, format, and documented request limits and distinguish observation from forecast products. informative
- AirNow data can be preliminary, spatially sparse, revised, or unsuitable for regulatory determination and does not replace local health advice, emergency alerts, or certified monitoring records. informative