Air Quality Index - Current
Current AQI from the nearest US air quality monitoring station within 75 miles.
Current AQI from the nearest US air quality monitoring station within 75 miles. Real-time observations only, not a forecast. Observations are preliminary, unvalidated data; see Data credits.
AQI categories: 1=Good #00E400, 2=Moderate #FFFF00, 3=Unhealthy for Sensitive Groups #FF7E00,
4=Unhealthy #FF0000, 5=Very Unhealthy #8F3F97, 6=Hazardous #7E0023
aqi reflects the worst-pollutant reading. All available pollutants are in pollutants.
observed_at uses the monitoring station's local time.
Token-based authentication with required prefix "Token"
In: header
Query Parameters
Latitude in decimal degrees (Northern Hemisphere only).
floatLongitude in decimal degrees.
floatResponse Body
application/json
application/json
application/json
application/json
curl -X GET "https://example.com/observations/aqi/?lat=32.78&lon=-96.8"{ "aqi": 78, "category": "Moderate", "category_number": 2, "color": "#FFFF00", "pollutants": [ { "pollutant": "PM2.5", "aqi": 78, "category_number": 2, "category": "Moderate", "color": "#FFFF00" }, { "pollutant": "OZONE", "aqi": 52, "category_number": 1, "category": "Good", "color": "#00E400" } ], "reporting_area": "Dallas", "observed_at": "2026-05-15 14:00 CDT", "location": { "lat": 32.78, "lon": -96.8 }, "source": "EPA AirNow", "response_ms": 142.3}