United States · America/Chicago
Chicago air quality
57
Moderate
CAMS model-based US AQI estimate
Highest pollutant sub-index: PM2.5
Model values for Oct 02 02:00 CDT · CAMS model estimate, may differ from monitoring stations and street-level conditions
Data may be delayed
AirNow by Skymory is an independent service; it is not affiliated with or endorsed by U.S. EPA or the official AirNow service.
Pollutants now (modeled)
- PM2.5Fine particles7.4 µg/m³
- PM10Coarse particles7.6 µg/m³
- O3Ozone33.1 µg/m³
- NO2Nitrogen dioxide18.2 µg/m³
- SO2Sulphur dioxide1.2 µg/m³
- COCarbon monoxide205.0 µg/m³
Weather in Chicago
See the temperature, rain and wind forecast for Chicago.
Chicago weather forecast on SkymoryNext 24 hours: PM2.5
Pollutant forecast
Hourly model samples in local time; no interpolation.
| Local time | PM2.5 µg/m³ | PM10 µg/m³ | O3 µg/m³ | NO2 µg/m³ | SO2 µg/m³ | CO µg/m³ |
|---|---|---|---|---|---|---|
| 6.2 | 6.4 | 37.1 | 14.8 | 1.1 | 198.3 | |
| 4.5 | 4.6 | 45.1 | 11.2 | 1.0 | 182.9 | |
| 3.1 | 3.2 | 53.5 | 8.4 | 1.0 | 167.5 | |
| 2.4 | 2.6 | 55.8 | 7.7 | 1.0 | 160.3 | |
| 2.7 | 2.9 | 52.5 | 10.1 | 1.2 | 162.8 | |
| 3.2 | 3.5 | 51.8 | 10.6 | 1.3 | 168.4 | |
| 3.5 | 3.9 | 56.1 | 8.5 | 1.4 | 169.1 | |
| 3.4 | 3.6 | 62.0 | 6.7 | 1.4 | 164.8 | |
| 3.4 | 3.6 | 67.3 | 5.4 | 1.3 | 161.2 | |
| 3.6 | 3.7 | 72.4 | 4.5 | 1.3 | 159.5 | |
| 3.7 | 3.8 | 77.7 | 3.9 | 1.2 | 158.6 | |
| 3.8 | 3.9 | 81.8 | 3.8 | 1.2 | 158.9 | |
| 3.8 | 4.0 | 84.4 | 3.9 | 1.2 | 159.5 | |
| 3.7 | 3.9 | 85.1 | 4.3 | 1.1 | 160.7 | |
| 3.7 | 3.8 | 83.5 | 5.2 | 1.1 | 163.7 | |
| 3.6 | 3.6 | 79.4 | 7.2 | 1.1 | 167.7 | |
| 3.9 | 4.0 | 70.6 | 11.9 | 1.1 | 175.7 | |
| 3.7 | 3.7 | 66.6 | 12.8 | 1.0 | 170.9 | |
| 3.2 | 3.3 | 64.2 | 12.4 | 0.9 | 167.1 | |
| 2.7 | 2.7 | 63.0 | 11.1 | 0.8 | 163.8 | |
| 2.1 | 2.2 | 62.9 | 9.0 | 0.7 | 161.7 | |
| 1.7 | 1.8 | 64.1 | 6.2 | 0.6 | 160.4 | |
| 1.4 | 1.5 | 64.3 | 4.3 | 0.6 | 159.8 | |
| 1.4 | 1.5 | 62.3 | 4.2 | 0.7 | 160.9 |
Data details: about this air quality estimate
Values are modeled by the Copernicus Atmosphere Monitoring Service (CAMS) global forecast, extracted and converted by Skymory for this city. They are model estimates on a coarse grid, not measurements from monitoring stations, and they do not resolve street-level exposure.
- Model initialization: 2026-10-01T12:00:00+00:00. Values valid: Oct 02 02:00 CDT. Retrieved: 2026-10-02T04:06:22.330698+00:00.
- Page generated from a snapshot with data state STALE_USABLE; model age 19.9 hours at generation.
- Nearest valid 0.4° model grid cell, about 17 km from the city point.
- Gases are converted with matching model-level 137 temperature, humidity, surface pressure (lnsp) and hybrid coefficients; particulate matter is read directly from the surface fields.
- AQI estimate completeness: COMPLETE (COMPLETE means all six pollutants have a complete model window).
The AQI estimate applies EPA breakpoints (May 2026) to explicit trailing model windows (PM 24 h, CO 8 h, NO2 1 h, SO2 and O3 per EPA rules). It is not a station observation, official daily maximum or NowCast, and the official AQI field remains unavailable.
Averaging windows used
- CO: 8h window
- NO2: 1h window
- O3: 1h, 8h window
- PM10: 24h window
- PM2.5: 24h window
- SO2: 1h, 24h window
Surface compatibility by pollutant
| Pollutant | Surface compatibility |
|---|---|
| PM2.5 | DIRECT_SURFACE |
| PM10 | DIRECT_SURFACE |
| O3 | DERIVABLE_SURFACE |
| NO2 | DERIVABLE_SURFACE |
| SO2 | DERIVABLE_SURFACE |
| CO | DERIVABLE_SURFACE |
Source and license
Contains modified Copernicus Atmosphere Monitoring Service information 2026; city extraction and concentration conversion. CAMS global atmospheric composition forecasts (ECMWF/CAMS). CC BY 4.0.
Provider times stay separate from page generation: collecting data or regenerating this page never resets the source time. Data sources and methodology
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