Air quality
Air quality in Lak Si today
Updated
Moderate (US AQI 74) Acceptable for most people. Unusually sensitive people should consider shortening long or heavy exertion outdoors. Model estimate for Mon, Oct 26, 7:00 am (00:00 UTC).
Live AQI, PM2.5, PM10 and ozone for Lak Si, Bangkok, Thailand, with a 48-hour forecast and the best time to be outside.
- US AQI now
- 74 Moderate
- PM2.5
- 27 µg/m³ 1.8× WHO 24-h guideline
- PM10
- 28 µg/m³
- Ozone
- 19 µg/m³
- Dominant pollutant
- PM2.5 sub-index 74
- Best hour today
- 12:00 pm AQI 72
- European AQI
- 47
Air quality in Lak Si right now
Right now the modelled US Air Quality Index for Lak Si, Bangkok, Thailand is 74, 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 74. 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 27 µg/m³, 1.8 times the WHO 24-hour guideline of 15 µg/m³; PM10 is 28 µg/m³ against a guideline of 45; ozone is 19 µg/m³ (below the WHO 8-hour level of 100); nitrogen dioxide is 36 µg/m³ (above the 24-hour guideline of 25).
Also this hour: carbon monoxide 1000 µg/m³.
Lak Si AQI forecast: next 48 hours
Over the next 24 hours the AQI is forecast to range from 72 around Mon 12:00 pm to 168 around Mon 7:00 pm, from "Moderate" at best to "Unhealthy" at worst.
The following day is expected to be cleaner, averaging about 92 against 97 for the next 24 hours.
| Local time (Asia/Bangkok) | US AQI | Category | PM2.5 µg/m³ | PM10 µg/m³ | Ozone µg/m³ |
|---|---|---|---|---|---|
| Mon 7:00 am | 74 | Moderate | 26.5 | 28 | 19 |
| Mon 10:00 am | 73 | Moderate | 22.9 | 27 | 120 |
| Mon 1:00 pm | 72 | Moderate | 22.8 | 24 | 202 |
| Mon 4:00 pm | 123 | Unhealthy for Sensitive Groups | 24.2 | 25 | 197 |
| Mon 7:00 pm | 168 | Unhealthy | 30.6 | 31 | 93 |
| Mon 10:00 pm | 109 | Unhealthy for Sensitive Groups | 36.1 | 36 | 58 |
| Tue 1:00 am | 81 | Moderate | 28.5 | 29 | 78 |
| Tue 4:00 am | 83 | Moderate | 21.7 | 22 | 72 |
| Tue 7:00 am | 83 | Moderate | 19.5 | 20 | 58 |
| Tue 10:00 am | 81 | Moderate | 16.3 | 17 | 130 |
| Tue 1:00 pm | 79 | Moderate | 16.4 | 17 | 192 |
| Tue 4:00 pm | 126 | Unhealthy for Sensitive Groups | 17.1 | 17 | 176 |
| Tue 7:00 pm | 149 | Unhealthy for Sensitive Groups | 25.5 | 26 | 63 |
| Tue 10:00 pm | 75 | Moderate | 33.2 | 33 | 37 |
| Wed 1:00 am | 74 | Moderate | 21 | 21 | 49 |
| Wed 4:00 am | 73 | Moderate | 14.3 | 15 | 57 |
| Wed 7:00 am | 71 | Moderate | 14.8 | 15 | 39 |
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 Lak Si today
Between 6 am and 9 pm local time, the cleanest air today is forecast around 12:00 pm (AQI 72, Moderate) and the worst around 7:00 pm (AQI 168). That is a swing of 96 points, so a run or walk around 12:00 pm is noticeably better.
Lak Si vs the rest of Thailand
Across 24 Thailand cities we track, the average US AQI right now is 56 (Moderate). Lak Si at 74 is 18 points worse than average.
For context, the median across 3,556 cities worldwide is 58.
Air quality in cities near Lak Si
| City | Distance | US AQI | Category | PM2.5 µg/m³ |
|---|---|---|---|---|
| Chatuchak | 7 km | 56 | Moderate | 13.1 |
| Mueang Nonthaburi | 8 km | 56 | Moderate | 13.1 |
| Lat Phrao | 10 km | 56 | Moderate | 13.1 |
| Bang Sue | 10 km | 56 | Moderate | 13.1 |
| Din Daeng | 11 km | 56 | Moderate | 13.1 |
| Wang Thonglang | 12 km | 56 | Moderate | 13.1 |
| Dusit | 14 km | 56 | Moderate | 13.1 |
| Bangkok | 17 km | 56 | Moderate | 13.1 |
Model vs measured
The nearest measured PM2.5 reading is 3.7 µg/m³ from Sensor.Community (median of 4 sensors), centred about 12 km from the city centre. That is 22.8 µg/m³ below the model estimate of 27 µg/m³. Low-cost sensors can read high in humid air; reference monitors are more accurate but sparser.
Wildfire smoke
PM2.5 is forecast to reach 38 µg/m³ in the next 24 hours while NASA satellites detected 14 fire hotspots within 300 km in the last day (nearest about 91 km away). Smoke is a likely contributor: keep windows closed, run an air purifier or HVAC filter, and check the fire map before heading out.
Advice for sensitive groups
At 74, 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 Lak Si
Air quality elsewhere
Data: Open-Meteo Air Quality API, Copernicus Atmosphere Monitoring Service (CAMS), Sensor.Community, NASA FIRMS.