Daily mean PM2.5, PM10, ozone, NO2 and US AQI over a date range, plus the count ...

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{ "example": { "asOf": "2026-10-21T00:33:14.201Z", "concentrationUnit": "μg/m³", "daily": [ { "date": "2025-01-01", "hours": 24, "nitrogenDioxideMean": 57.4, "ozoneMean": 12.9, "pm10Mean": 30.5, "pm2_5Mean": 30.2, "usAqiMax": 97, "usAqiMean": 92.2 }, { "date": "2025-01-02", "hours": 24, "nitrogenDioxideMean": 66.5, "ozoneMean": 13.1, "pm10Mean": 33.6, "pm2_5Mean": 33.2, "usAqiMax": 96, "usAqiMean": 91.8 } ], "daysAboveThreshold": 7, "daysRequested": 31, "daysWithAnyHourAboveThreshold": 9, "daysWithData": 31, "degraded": false, "disclaimer": "Screening signal computed from the named public source. Not financial, legal or investment advice; provided as is. Verify at the source before acting.", "end": "2025-01-31", "meanNitrogenDioxide": 55.8, "meanOzone": 30.3, "meanPm10": 34.9, "meanPm2_5": 33.7, "meanUsAqi": 90.9, "notChecked": [ "real monitor readings: CAMS model output, smoothed at about 11 km", "EPA's 24-hour PM2.5 AQI method: the daily mean here is the mean of hourly Open-Meteo AQI values", "…1 more" ], "reasons": [ "7 of 31 days had a daily-mean US AQI above 100." ], "source": "Open-Meteo Air Quality API (CAMS model reanalysis and forecast)", "sourceUrl": "https://open-meteo.com/en/docs/air-quality-api", "start": "2025-01-01", "summary": "7 of 31 days had a daily-mean US AQI above 100; the worst hour reached 227 (Very Unhealthy) on 2025-01-11.", "threshold": 100, "verdict": "SOME_DAYS_ABOVE_THRESHOLD", "worstDay": { "date": "2025-01-11", "maxUsAqi": 227 } }, "type": "json" }