PM2.5 observation snapshot
5.3 µg/m³ · 12 sensors
Prepared:
Values refer to the stated observation times. Open the map for the latest readings.
Open mapSeattle Air Quality — PM2.5 & Sensors
United States
Sensors and observation times
| Sensor | PM2.5 (µg/m³) | UTC |
|---|---|---|
| 201 Elliott Ave W | 4.0 | |
| Jon & Leska’s | 2.5 | |
| Salmon Bay Park | 6.0 | |
| MT-Co-op | 8.5 | |
| Greenwood | 0.0 | |
| Seattle Duwamish #1 | 3.0 | |
| Crown Hill | 8.7 | |
| holmdell | 8.2 | |
| Alaska Junction | 7.8 | |
| Maple Leaf, Seattle, WA | 6.0 | |
| Wedgwood, Seattle | 0.0 | |
| W Olympic Pl, Seattle | 9.0 |
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