Air quality
Air quality in Nghi Sơn today
Updated
Moderate (US AQI 64) Acceptable for most people. Unusually sensitive people should consider shortening long or heavy exertion outdoors. Model estimate for Mon, Oct 26, 2:00 am (19:00 UTC).
Live AQI, PM2.5, PM10 and ozone for Nghi Sơn, Thanh Hóa Province, Vietnam, with a 48-hour forecast and the best time to be outside.
- US AQI now
- 64 Moderate
- PM2.5
- 15 µg/m³ 1× WHO 24-h guideline
- PM10
- 19 µg/m³
- Ozone
- 121 µg/m³
- Dominant pollutant
- ozone sub-index 64
- Best hour today
- 6:00 am AQI 71
- European AQI
- 61
Air quality in Nghi Sơn right now
Right now the modelled US Air Quality Index for Nghi Sơn, Thanh Hóa Province, Vietnam is 64, which falls in the "Moderate" band (up to 100). Acceptable for most people. Unusually sensitive people should consider shortening long or heavy exertion outdoors.
The index is driven mainly by ozone, whose own sub-index is 64. Ozone usually peaks in the afternoon on sunny days and falls back after sunset.
PM2.5 is 15 µg/m³, within the WHO 24-hour guideline of 15 µg/m³; PM10 is 19 µg/m³ against a guideline of 45; ozone is 121 µg/m³ (above the WHO 8-hour level of 100); nitrogen dioxide is 3.3 µg/m³ (below the 24-hour guideline of 25).
Also this hour: carbon monoxide 267 µg/m³.
NASA FIRMS shows 84 fire hotspots within 300 km in the last day (nearest about 3 km), but particle levels are not elevated enough to point to smoke right now.
Nghi Sơn AQI forecast: next 48 hours
Over the next 24 hours the AQI is forecast to range from 64 around Mon 2:00 am to 110 around Tue 2:00 am, from "Moderate" at best to "Unhealthy for Sensitive Groups" at worst.
The following day is expected to be worse, averaging about 102 against 86 for the next 24 hours.
| Local time (Asia/Bangkok) | US AQI | Category | PM2.5 µg/m³ | PM10 µg/m³ | Ozone µg/m³ |
|---|---|---|---|---|---|
| Mon 2:00 am | 64 | Moderate | 14.5 | 19 | 121 |
| Mon 5:00 am | 70 | Moderate | 13 | 17 | 120 |
| Mon 8:00 am | 71 | Moderate | 13.8 | 17 | 122 |
| Mon 11:00 am | 74 | Moderate | 15.5 | 20 | 137 |
| Mon 2:00 pm | 90 | Moderate | 16.4 | 21 | 147 |
| Mon 5:00 pm | 103 | Unhealthy for Sensitive Groups | 19.8 | 26 | 128 |
| Mon 8:00 pm | 99 | Moderate | 18.3 | 24 | 134 |
| Mon 11:00 pm | 99 | Moderate | 17.7 | 23 | 159 |
| Tue 2:00 am | 110 | Unhealthy for Sensitive Groups | 10.2 | 14 | 128 |
| Tue 5:00 am | 101 | Unhealthy for Sensitive Groups | 6.1 | 9 | 92 |
| Tue 8:00 am | 60 | Moderate | 7 | 10 | 97 |
| Tue 11:00 am | 59 | Moderate | 11.4 | 16 | 124 |
| Tue 2:00 pm | 59 | Moderate | 16.1 | 21 | 156 |
| Tue 5:00 pm | 103 | Unhealthy for Sensitive Groups | 27.4 | 34 | 173 |
| Tue 8:00 pm | 142 | Unhealthy for Sensitive Groups | 26.9 | 33 | 177 |
| Tue 11:00 pm | 159 | Unhealthy | 25.6 | 32 | 179 |
| Wed 2:00 am | 163 | Unhealthy | 21.2 | 27 | 166 |
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 Nghi Sơn today
Between 6 am and 9 pm local time, the cleanest air today is forecast around 6:00 am (AQI 71, Moderate) and the worst around 5:00 pm (AQI 103). That is a swing of 32 points, so a run or walk around 6:00 am is noticeably better.
Nghi Sơn vs the rest of Vietnam
Across 21 Vietnam cities we track, the average US AQI right now is 91 (Moderate). Nghi Sơn at 64 is 27 points cleaner than average.
For context, the median across 667 cities worldwide is 71.
Air quality in cities near Nghi Sơn
| City | Distance | US AQI | Category | PM2.5 µg/m³ |
|---|---|---|---|---|
| Kiến An | 185 km | 93 | Moderate | 26.6 |
| Tương Mai | 185 km | 109 | Unhealthy for Sensitive Groups | 66.4 |
| Thanh Xuân | 185 km | 109 | Unhealthy for Sensitive Groups | 66.4 |
| Đống Đa | 187 km | 109 | Unhealthy for Sensitive Groups | 66.4 |
| Hai Bà Trưng | 187 km | 109 | Unhealthy for Sensitive Groups | 66.4 |
| Hanoi | 189 km | 109 | Unhealthy for Sensitive Groups | 66.4 |
| Hoàn Kiếm | 189 km | 109 | Unhealthy for Sensitive Groups | 66.4 |
| Cầu Giấy | 190 km | 109 | Unhealthy for Sensitive Groups | 66.4 |
Model vs measured
We found no measured PM2.5 sensor cell within 25 km of Nghi Sơn, 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
At 64, most people are fine outdoors. If you are unusually sensitive to ozone, keep long or intense workouts to the cleaner hours shown above.
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 Nghi Sơn
Air quality elsewhere
Data: Open-Meteo Air Quality API, Copernicus Atmosphere Monitoring Service (CAMS), NASA FIRMS.