Air quality
Air quality in Miyakonojō today
Updated
Good (US AQI 22) Air quality is satisfactory and poses little or no risk; a good time for outdoor activity. Model estimate for Mon, Oct 26, 6:00 am (21:00 UTC).
Live AQI, PM2.5, PM10 and ozone for Miyakonojō, Miyazaki, Japan, with a 48-hour forecast and the best time to be outside.
- US AQI now
- 22 Good
- PM2.5
- 4.1 µg/m³ 0.3× WHO 24-h guideline
- PM10
- 5.3 µg/m³
- Ozone
- 76 µg/m³
- Dominant pollutant
- PM2.5 sub-index 22
- Best hour today
- 6:00 am AQI 22
- European AQI
- 28
Air quality in Miyakonojō right now
Right now the modelled US Air Quality Index for Miyakonojō, Miyazaki, Japan is 22, 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 PM2.5, whose own sub-index is 22. Fine and coarse particles come from traffic, heating, industry, dust and smoke; they build up on calm nights and clear when wind or rain arrives.
PM2.5 is 4.1 µg/m³, within the WHO 24-hour guideline of 15 µg/m³; PM10 is 5.3 µg/m³ against a guideline of 45; ozone is 76 µg/m³ (below the WHO 8-hour level of 100); nitrogen dioxide is 1.6 µg/m³ (below the 24-hour guideline of 25).
Also this hour: carbon monoxide 143 µg/m³.
NASA FIRMS shows 2 fire hotspots within 300 km in the last day (nearest about 43 km), but particle levels are not elevated enough to point to smoke right now.
Miyakonojō AQI forecast: next 48 hours
Over the next 24 hours the AQI is forecast to range from 20 around Tue 4:00 am to 35 around Mon 4:00 pm, staying "Good" throughout.
The following day is expected to be worse, averaging about 36 against 29 for the next 24 hours.
| Local time (Asia/Tokyo) | US AQI | Category | PM2.5 µg/m³ | PM10 µg/m³ | Ozone µg/m³ |
|---|---|---|---|---|---|
| Mon 6:00 am | 22 | Good | 4.1 | 5 | 76 |
| Mon 9:00 am | 27 | Good | 2.8 | 4 | 68 |
| Mon 12:00 pm | 32 | Good | 2.3 | 3 | 77 |
| Mon 3:00 pm | 34 | Good | 4.6 | 7 | 80 |
| Mon 6:00 pm | 35 | Good | 4.3 | 6 | 69 |
| Mon 9:00 pm | 34 | Good | 4.4 | 5 | 49 |
| Tue 12:00 am | 27 | Good | 2.9 | 3 | 36 |
| Tue 3:00 am | 21 | Good | 3.1 | 4 | 40 |
| Tue 6:00 am | 20 | Good | 4.7 | 6 | 38 |
| Tue 9:00 am | 21 | Good | 6.6 | 9 | 68 |
| Tue 12:00 pm | 26 | Good | 8.1 | 11 | 95 |
| Tue 3:00 pm | 37 | Good | 10.3 | 14 | 107 |
| Tue 6:00 pm | 45 | Good | 10.3 | 12 | 95 |
| Tue 9:00 pm | 46 | Good | 7.2 | 9 | 83 |
| Wed 12:00 am | 41 | Good | 7.9 | 11 | 57 |
| Wed 3:00 am | 42 | Good | 8.5 | 11 | 35 |
| Wed 6:00 am | 46 | Good | 8.2 | 11 | 19 |
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 Miyakonojō today
Between 6 am and 9 pm local time, the cleanest air today is forecast around 6:00 am (AQI 22, Good) and the worst around 4:00 pm (AQI 35). That is a swing of 13 points, so a run or walk around 6:00 am is noticeably better.
Miyakonojō vs the rest of Japan
Across 180 Japan cities we track, the average US AQI right now is 49 (Good). Miyakonojō at 22 is 27 points cleaner than average.
For context, the median across 3,909 cities worldwide is 56.
Air quality in cities near Miyakonojō
| City | Distance | US AQI | Category | PM2.5 µg/m³ |
|---|---|---|---|---|
| Miyazaki | 39 km | 27 | Good | 5 |
| Kagoshima | 52 km | 28 | Good | 3.5 |
| Kotō | 120 km | 32 | Good | 1.7 |
| Kumamoto | 124 km | 32 | Good | 1.7 |
| Isahaya | 156 km | 26 | Good | 4 |
| Nagasaki | 159 km | 26 | Good | 4 |
| Ōita | 174 km | 25 | Good | 4.1 |
| Beppu | 177 km | 25 | Good | 4.1 |
Model vs measured
We found no measured PM2.5 sensor cell within 25 km of Miyakonojō, 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 22, 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 Miyakonojō
Air quality elsewhere
Data: Open-Meteo Air Quality API, Copernicus Atmosphere Monitoring Service (CAMS), NASA FIRMS.