PM2.5 observation snapshot
5.6 µg/m³ · 8 sensors
Prepared:
Values refer to the stated observation times. Open the map for the latest readings.
Open mapChicago Air Quality — PM2.5 & Sensors
United States
Sensors and observation times
| Sensor | PM2.5 (µg/m³) | UTC |
|---|---|---|
| Jeff Park | 2.3 | |
| South Loop | 8.5 | |
| Wells & Ontario Bus Station | 3.2 | |
| Avalon Park | 0.0 | |
| West Albany Park, Chicago | 11.3 | |
| Nettelhorst | 3.0 | |
| Portage Park - Chicago | 11.0 | |
| Chicago-Logan Square | 5.2 |
Methodology and limitations
The value is the arithmetic mean of the latest available individual sensor observations, each at most one hour old when the snapshot was prepared. It is neither a 24-hour average nor an AQI index.
Duplicate sensor records do not increase their weight. Missing, negative and PM2.5 readings above 500 µg/m³ are excluded under the Atmy quality rule. Pilot cities require at least three qualifying sensors. Sensor count does not guarantee uniform coverage or laboratory accuracy.
Source: public Atmy monitoring data. Data terms