Air quality
Air quality in Samut Prakan today
Updated
Moderate (US AQI 55) Acceptable for most people. Unusually sensitive people should consider shortening long or heavy exertion outdoors. Model estimate for Mon, Oct 26, 8:00 am (01:00 UTC).
Live AQI, PM2.5, PM10 and ozone for Samut Prakan, Thailand, with a 48-hour forecast and the best time to be outside.
- US AQI now
- 55 Moderate
- PM2.5
- 15 µg/m³ 1× WHO 24-h guideline
- PM10
- 18 µg/m³
- Ozone
- 63 µg/m³
- Dominant pollutant
- PM2.5 sub-index 55
- Best hour today
- 8:00 am AQI 55
- European AQI
- 40
Air quality in Samut Prakan right now
Right now the modelled US Air Quality Index for Samut Prakan, Thailand is 55, 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 55. 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 15 µg/m³, 1 times the WHO 24-hour guideline of 15 µg/m³; PM10 is 18 µg/m³ against a guideline of 45; ozone is 63 µg/m³ (below the WHO 8-hour level of 100); nitrogen dioxide is 18 µg/m³ (below the 24-hour guideline of 25).
Also this hour: UV index 1.6, carbon monoxide 524 µg/m³.
NASA FIRMS shows 3 fire hotspots within 300 km in the last day (nearest about 122 km), but particle levels are not elevated enough to point to smoke right now.
Samut Prakan AQI forecast: next 48 hours
Over the next 24 hours the AQI is forecast to range from 55 around Mon 8:00 am to 138 around Mon 7:00 pm, from "Moderate" at best to "Unhealthy for Sensitive Groups" at worst.
The following day is expected to be worse, averaging about 104 against 80 for the next 24 hours.
| Local time (Asia/Bangkok) | US AQI | Category | PM2.5 µg/m³ | PM10 µg/m³ | Ozone µg/m³ |
|---|---|---|---|---|---|
| Mon 8:00 am | 55 | Moderate | 15.1 | 18 | 63 |
| Mon 11:00 am | 55 | Moderate | 18.8 | 24 | 124 |
| Mon 2:00 pm | 56 | Moderate | 21.8 | 26 | 182 |
| Mon 5:00 pm | 114 | Unhealthy for Sensitive Groups | 21.2 | 24 | 156 |
| Mon 8:00 pm | 136 | Unhealthy for Sensitive Groups | 20 | 21 | 105 |
| Mon 11:00 pm | 92 | Moderate | 19.2 | 20 | 95 |
| Tue 2:00 am | 66 | Moderate | 17.9 | 18 | 89 |
| Tue 5:00 am | 68 | Moderate | 14.8 | 15 | 80 |
| Tue 8:00 am | 69 | Moderate | 21.7 | 22 | 90 |
| Tue 11:00 am | 71 | Moderate | 27.4 | 28 | 182 |
| Tue 2:00 pm | 109 | Unhealthy for Sensitive Groups | 24.4 | 25 | 236 |
| Tue 5:00 pm | 184 | Unhealthy | 19.4 | 20 | 155 |
| Tue 8:00 pm | 168 | Unhealthy | 23.7 | 24 | 57 |
| Tue 11:00 pm | 75 | Moderate | 29.1 | 29 | 28 |
| Wed 2:00 am | 77 | Moderate | 24.7 | 25 | 31 |
| Wed 5:00 am | 78 | Moderate | 21.6 | 22 | 36 |
| Wed 8:00 am | 79 | Moderate | 21.2 | 22 | 62 |
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 Samut Prakan today
Between 6 am and 9 pm local time, the cleanest air today is forecast around 8:00 am (AQI 55, Moderate) and the worst around 7:00 pm (AQI 138). That is a swing of 83 points, so a run or walk around 8:00 am is noticeably better.
Samut Prakan vs the rest of Thailand
Across 24 Thailand cities we track, the average US AQI right now is 55 (Moderate). Samut Prakan at 55 is about average.
It ranks 4 of 24 from cleanest to most polluted; the cleanest is Pattaya (49) and the most polluted Bang Bon (56).
For context, the median across 3,556 cities worldwide is 58.
Air quality in cities near Samut Prakan
| City | Distance | US AQI | Category | PM2.5 µg/m³ |
|---|---|---|---|---|
| Phra Pradaeng | 10 km | 56 | Moderate | 14.7 |
| Thung Khru | 10 km | 56 | Moderate | 14.7 |
| Khlong Toei | 13 km | 56 | Moderate | 14.7 |
| Watthana | 15 km | 56 | Moderate | 14.7 |
| Chom Thong | 15 km | 56 | Moderate | 14.7 |
| Thon Buri | 19 km | 56 | Moderate | 14.7 |
| Bang Khun Thian | 19 km | 56 | Moderate | 14.7 |
| Bangkok | 20 km | 56 | Moderate | 14.7 |
Model vs measured
The nearest measured PM2.5 reading is 2.5 µg/m³ from Sensor.Community (median of 6 sensors), centred about 21 km from the city centre. That is 12.6 µg/m³ below the model estimate of 15 µg/m³. Low-cost sensors can read high in humid air; reference monitors are more accurate but sparser.
Advice for sensitive groups
At 55, 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 Samut Prakan
Air quality elsewhere
Data: Open-Meteo Air Quality API, Copernicus Atmosphere Monitoring Service (CAMS), Sensor.Community, NASA FIRMS.