City, Cambodia
Air quality in Siem Reap
Severely polluted
The annual average PM2.5 in Siem Reap was 37 µg/m³ in 2021, about 7.4 times the WHO guideline of 5 µg/m³. Dry-season dust and burning haze can raise PM2.5 in Jan–Mar.
Key facts
- PM2.5: 37 µg/m³ yearly average (2021). Measured at Siem Reap.
- Worst months: Jan–Mar.
- Recent average: 28.7 µg/m³ over the last five years of measurements.
PM2.5 by year
| Year | Annual average |
|---|---|
| 2021 | |
| 2020 | |
| 2019 |
Air quality across Cambodia
| Place | PM2.5 | Level |
|---|---|---|
| Kep | 10 µg/m³ | Fairly clean |
| Kampot | 13 µg/m³ | Moderate |
| Phnom Penh | 19 µg/m³ | Polluted |
| Sihanoukville | 19 µg/m³ | Polluted |
| Battambang | 35 µg/m³ | Very polluted |
| Siem Reap | 37 µg/m³ | Severely polluted |
Quick answers
Is the air in Siem Reap bad?
Severely polluted: 37 µg/m³ of PM2.5 on average, 7.4× the WHO guideline. It's usually worst in Jan–Mar.
When is the air worst in Siem Reap?
Dry-season dust and burning haze can raise PM2.5 in Jan–Mar.
How does Siem Reap compare with the rest of Cambodia?
People in Cambodia breathe 19 µg/m³ of PM2.5 on average (2023, World Bank/WHO), against 37 µg/m³ measured here.
More about Siem Reap
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Sources
- WHO Ambient Air Quality Database
- WHO air quality guidelines (2021)
- Live air quality map (WAQI)
- Angkor Enterprise (Angkor Pass)
- Cambodia e-Visa
- Royal Angkor International Hospital
- Grab Cambodia
Annual averages are measured values reported to the WHO; check a live map for today's air. Compiled and reviewed by SoloSquare. How we compile and score this. Spotted something out of date? Tell us.