Air quality
Air quality in Walla Walla today
Updated
Good (US AQI 15) Air quality is satisfactory and poses little or no risk; a good time for outdoor activity. Model estimate for Sun, Oct 25, 11:00 am (18:00 UTC).
Live AQI, PM2.5, PM10 and ozone for Walla Walla, Washington, United States, with a 48-hour forecast and the best time to be outside.
- US AQI now
- 15 Good
- PM2.5
- 1.1 µg/m³ 0.1× WHO 24-h guideline
- PM10
- 1.2 µg/m³
- Ozone
- 50 µg/m³
- Dominant pollutant
- ozone sub-index 15
- Best hour today
- 11:00 am AQI 15
- European AQI
- 17
Air quality in Walla Walla right now
Right now the modelled US Air Quality Index for Walla Walla, Washington, United States is 15, which falls in the "Good" band (up to 50). Air quality is satisfactory and poses little or no risk; a good time for outdoor activity.
The index is driven mainly by ozone, whose own sub-index is 15. Ozone usually peaks in the afternoon on sunny days and falls back after sunset.
PM2.5 is 1.1 µg/m³, within the WHO 24-hour guideline of 15 µg/m³; PM10 is 1.2 µg/m³ against a guideline of 45; ozone is 50 µg/m³ (below the WHO 8-hour level of 100); nitrogen dioxide is 2.5 µg/m³ (below the 24-hour guideline of 25).
Also this hour: UV index 2, carbon monoxide 180 µg/m³.
NASA FIRMS shows 24 fire hotspots within 300 km in the last day (nearest about 144 km), but particle levels are not elevated enough to point to smoke right now.
Walla Walla AQI forecast: next 48 hours
Over the next 24 hours the AQI is forecast to range from 14 around Mon 4:00 am to 26 around Sun 6:00 pm, staying "Good" throughout.
The following day is expected to be worse, averaging about 26 against 20 for the next 24 hours.
| Local time (America/Los_Angeles) | US AQI | Category | PM2.5 µg/m³ | PM10 µg/m³ | Ozone µg/m³ |
|---|---|---|---|---|---|
| Sun 11:00 am | 15 | Good | 1.1 | 1 | 50 |
| Sun 2:00 pm | 20 | Good | 2 | 2 | 62 |
| Sun 5:00 pm | 25 | Good | 2.2 | 2 | 55 |
| Sun 8:00 pm | 26 | Good | 3.5 | 4 | 39 |
| Sun 11:00 pm | 22 | Good | 3.8 | 4 | 30 |
| Mon 2:00 am | 17 | Good | 4.2 | 4 | 26 |
| Mon 5:00 am | 14 | Good | 4.6 | 5 | 22 |
| Mon 8:00 am | 17 | Good | 5.9 | 6 | 22 |
| Mon 11:00 am | 20 | Good | 7.1 | 7 | 42 |
| Mon 2:00 pm | 24 | Good | 3.7 | 5 | 71 |
| Mon 5:00 pm | 25 | Good | 2.2 | 3 | 72 |
| Mon 8:00 pm | 31 | Good | 1.9 | 2 | 54 |
| Mon 11:00 pm | 29 | Good | 1.5 | 2 | 49 |
| Tue 2:00 am | 25 | Good | 0.9 | 1 | 52 |
| Tue 5:00 am | 24 | Good | 0.6 | 1 | 56 |
| Tue 8:00 am | 25 | Good | 0.8 | 1 | 57 |
| Tue 11:00 am | 26 | Good | 0.8 | 1 | 68 |
Every third hour of the CAMS forecast via Open-Meteo. US AQI uses rolling averages (24 h for particles, 8 h for ozone), so it moves more slowly than the hourly concentrations.
Best time to be outside in Walla Walla today
Between 6 am and 9 pm local time, the cleanest air today is forecast around 11:00 am (AQI 15, Good) and the worst around 6:00 pm (AQI 26). That is a swing of 11 points, so a run or walk around 11:00 am is noticeably better.
Walla Walla vs the rest of United States
Across 747 United States cities we track, the average US AQI right now is 48 (Good). Walla Walla at 15 is 33 points cleaner than average.
It ranks 2 of 747 from cleanest to most polluted; the cleanest is Aberdeen, SD (13) and the most polluted Springfield, PA (130).
For context, the median across 3,909 cities worldwide is 57.
Air quality in cities near Walla Walla
| City | Distance | US AQI | Category | PM2.5 µg/m³ |
|---|---|---|---|---|
| Kennewick | 63 km | 47 | Good | 11 |
| Richland | 77 km | 47 | Good | 11 |
| Moscow, ID | 127 km | 19 | Good | 1.9 |
| Yakima | 176 km | 20 | Good | 5.8 |
| Spokane | 190 km | 46 | Good | 5 |
| Post Falls | 212 km | 22 | Good | 4.8 |
| Wenatchee | 213 km | 35 | Good | 6.3 |
| Coeur d'Alene | 215 km | 22 | Good | 4.8 |
Model vs measured
We found no measured PM2.5 sensor cell within 25 km of Walla Walla, so the numbers on this page are model estimates. Models capture regional pollution well but can miss very local sources such as a busy road or a nearby fire.
Advice for sensitive groups
With the AQI at 15, there is no need for sensitive groups to change plans. People with asthma should still carry their reliever inhaler as usual.
What the US AQI numbers mean
| US AQI | Category | What it means |
|---|---|---|
| 0-50 | Good | Air quality is satisfactory and poses little or no risk; a good time for outdoor activity. |
| 51-100 | Moderate | Acceptable for most people. Unusually sensitive people should consider shortening long or heavy exertion outdoors. |
| 101-150 | Unhealthy for Sensitive Groups | People with heart or lung disease, older adults, children and teens should cut back on prolonged or heavy exertion outdoors. |
| 151-200 | Unhealthy | Everyone should reduce prolonged or heavy exertion outdoors; sensitive groups should avoid it and keep windows closed. |
| 201-300 | Very Unhealthy | Health alert: everyone should avoid prolonged or heavy exertion outdoors, and sensitive groups should stay indoors. |
| 301-500 | Hazardous | Emergency conditions: everyone should avoid all outdoor physical activity and stay indoors with filtered air if possible. The scale tops out at 500; heavier dust or smoke is shown as 500. |
Values on this page are modelled by CAMS (Copernicus) and served by Open-Meteo; they are estimates for the area around the city centre, not readings from an official monitor.
Nearby cities
More for Walla Walla
Air quality elsewhere
Data: Open-Meteo Air Quality API, Copernicus Atmosphere Monitoring Service (CAMS), NASA FIRMS.