Air quality
Air quality in Sầm Sơn today
Updated
Moderate (US AQI 66) Acceptable for most people. Unusually sensitive people should consider shortening long or heavy exertion outdoors. Model estimate for Mon, Oct 26, 9:00 am (02:00 UTC).
Live AQI, PM2.5, PM10 and ozone for Sầm Sơn, Thanh Hóa Province, Vietnam, with a 48-hour forecast and the best time to be outside.
- US AQI now
- 66 Moderate
- PM2.5
- 23 µg/m³ 1.5× WHO 24-h guideline
- PM10
- 27 µg/m³
- Ozone
- 139 µg/m³
- Dominant pollutant
- PM2.5 sub-index 66
- Best hour today
- 9:00 am AQI 66
- European AQI
- 70
Air quality in Sầm Sơn right now
Right now the modelled US Air Quality Index for Sầm Sơn, Thanh Hóa Province, Vietnam is 66, 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 PM2.5, whose own sub-index is 66. 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 23 µg/m³, 1.5 times the WHO 24-hour guideline of 15 µg/m³; PM10 is 27 µg/m³ against a guideline of 45; ozone is 139 µg/m³ (above the WHO 8-hour level of 100); nitrogen dioxide is 6.4 µg/m³ (below the 24-hour guideline of 25).
Also this hour: UV index 3.8, carbon monoxide 304 µg/m³.
NASA FIRMS shows 37 fire hotspots within 300 km in the last day (nearest about 40 km), but particle levels are not elevated enough to point to smoke right now.
Sầm Sơn AQI forecast: next 48 hours
Over the next 24 hours the AQI is forecast to range from 65 around Tue 9:00 am to 109 around Mon 4:00 pm, from "Moderate" at best to "Unhealthy for Sensitive Groups" at worst.
The following day is expected to be worse, averaging about 93 against 79 for the next 24 hours.
| Local time (Asia/Ho_Chi_Minh) | US AQI | Category | PM2.5 µg/m³ | PM10 µg/m³ | Ozone µg/m³ |
|---|---|---|---|---|---|
| Mon 9:00 am | 66 | Moderate | 23.1 | 27 | 139 |
| Mon 12:00 pm | 77 | Moderate | 19.7 | 24 | 153 |
| Mon 3:00 pm | 105 | Unhealthy for Sensitive Groups | 17.9 | 24 | 128 |
| Mon 6:00 pm | 101 | Unhealthy for Sensitive Groups | 16.4 | 22 | 104 |
| Mon 9:00 pm | 72 | Moderate | 17.3 | 22 | 125 |
| Tue 12:00 am | 72 | Moderate | 15.7 | 19 | 117 |
| Tue 3:00 am | 70 | Moderate | 16.4 | 19 | 101 |
| Tue 6:00 am | 68 | Moderate | 12.1 | 14 | 99 |
| Tue 9:00 am | 65 | Moderate | 15.2 | 19 | 118 |
| Tue 12:00 pm | 63 | Moderate | 17.8 | 22 | 146 |
| Tue 3:00 pm | 90 | Moderate | 22.9 | 28 | 160 |
| Tue 6:00 pm | 121 | Unhealthy for Sensitive Groups | 26.9 | 33 | 150 |
| Tue 9:00 pm | 126 | Unhealthy for Sensitive Groups | 29.3 | 35 | 135 |
| Wed 12:00 am | 109 | Unhealthy for Sensitive Groups | 37 | 41 | 121 |
| Wed 3:00 am | 85 | Moderate | 36.1 | 40 | 115 |
| Wed 6:00 am | 81 | Moderate | 36.1 | 40 | 99 |
| Wed 9:00 am | 88 | Moderate | 40.3 | 45 | 130 |
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 Sầm Sơn today
Between 6 am and 9 pm local time, the cleanest air today is forecast around 9:00 am (AQI 66, Moderate) and the worst around 4:00 pm (AQI 109). That is a swing of 43 points, so a run or walk around 9:00 am is noticeably better.
Sầm Sơn vs the rest of Vietnam
Across 64 Vietnam cities we track, the average US AQI right now is 83 (Moderate). Sầm Sơn at 66 is 17 points cleaner than average.
For context, the median across 3,556 cities worldwide is 58.
Air quality in cities near Sầm Sơn
| City | Distance | US AQI | Category | PM2.5 µg/m³ |
|---|---|---|---|---|
| Thanh Hóa | 16 km | 80 | Moderate | 28.6 |
| Nghi Sơn | 46 km | 71 | Moderate | 14.1 |
| Hoàng Mai | 55 km | 71 | Moderate | 14.1 |
| Hoa Lư | 59 km | 106 | Unhealthy for Sensitive Groups | 28.7 |
| Nam Định | 83 km | 106 | Unhealthy for Sensitive Groups | 28.7 |
| Vinh | 120 km | 69 | Moderate | 13.9 |
| Yên Vinh | 121 km | 69 | Moderate | 13.9 |
| Mỹ Hào | 133 km | 116 | Unhealthy for Sensitive Groups | 26.1 |
Model vs measured
We found no measured PM2.5 sensor cell within 25 km of Sầm 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 66, most people are fine outdoors. If you are unusually sensitive to PM2.5, 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 Sầm Sơn
Air quality elsewhere
Data: Open-Meteo Air Quality API, Copernicus Atmosphere Monitoring Service (CAMS), NASA FIRMS.