Air quality
Air quality in Phnom Penh 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, 6:59 am (23:59 UTC).
Live AQI, PM2.5, PM10 and ozone for Phnom Penh, Cambodia, with a 48-hour forecast and the best time to be outside.
- US AQI now
- 66 Moderate
- PM2.5
- 22 µg/m³ 1.5× WHO 24-h guideline
- PM10
- 25 µg/m³
- Ozone
- 47 µg/m³
Air quality in Phnom Penh right now
Right now the modelled US Air Quality Index for Phnom Penh, Cambodia 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.
PM2.5 is 22 µg/m³, 1.5 times the WHO 24-hour guideline of 15 µg/m³; PM10 is 25 µg/m³ against a guideline of 45; ozone is 47 µg/m³ (below the WHO 8-hour level of 100); nitrogen dioxide is 9.8 µg/m³ (below the 24-hour guideline of 25).
NASA FIRMS shows 32 fire hotspots within 300 km in the last day (nearest about 34 km), but particle levels are not elevated enough to point to smoke right now.
Phnom Penh vs the rest of Cambodia
Across 2 Cambodia cities we track, the average US AQI right now is 63 (Moderate). Phnom Penh at 66 is about average.
It ranks 2 of 2 from cleanest to most polluted; the cleanest is Takeo (60) and the most polluted Phnom Penh (66).
For context, the median across 3,909 cities worldwide is 57.
Air quality in cities near Phnom Penh
| City | Distance | US AQI | Category | PM2.5 µg/m³ |
|---|---|---|---|---|
| Takeo | 65 km | 60 | Moderate | 27.9 |
| Long Xuyên | 143 km | 77 | Moderate | 34.8 |
| Phú Quốc, An Giang | 173 km | 37 | Good | 10.6 |
| Rạch Giá | 173 km | 67 | Moderate | 27.8 |
| Phu Quoc | 181 km | 37 | Good | 10.6 |
| Bình Thủy | 188 km | 75 | Moderate | 31.2 |
| Bến Cát | 189 km | 63 | Moderate | 15.7 |
| Cần Thơ | 195 km | 75 | Moderate | 31.2 |
Model vs measured
We found no measured PM2.5 sensor cell within 25 km of Phnom Penh, 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 air pollution, 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 Phnom Penh
Air quality elsewhere
Data: Open-Meteo Air Quality API, Copernicus Atmosphere Monitoring Service (CAMS), NASA FIRMS.