Smog in Siem Reap — Live Data: AQI, Fine Dust, Wind, UV and Health Advice

Latest air quality data: Siem Reap

Locations: Phnom Penh » Kampong Saom » Battambang » Siem Reap

Pollution and air quality forecast for Siem Reap. Today is Thursday, August 27, 2026. The following air pollution values have been recorded for Siem Reap:

particulate matter (PM2.5) dust - 2 (Good)
particulate matter (PM10) suspended dust - 2 (Good)
ozone (O3) - 46 (Good)
nitrogen dioxide (NO2) - 2 (Good)
sulfur dioxide (SO2) - 0 (Good)
carbon monoxide (CO) - 139 (Good)

Real-time Air Quality Index (AQI) for Siem Reap, Thursday, August 27, 2026: 1.

AQI 1 Good

What is the air quality in Siem Reap today? Is the air polluted in Siem Reap?. Is there smog?

Today (Thursday, August 27, 2026) air quality is good. The air quality has no effect on health. Everyone can continue their outdoor activities normally in Siem Reap.

What is the current level of PM2.5 in Siem Reap? (particulate matter (PM2.5) dust)
Today's PM2.5 level is: 2 (Good) For comparison, the highest level of PM2.5 in Siem Reap in the last 7 days was: 6 (Wednesday, August 26, 2026) and the lowest: 2 (Thursday, August 20, 2026).

What is the level of PM10 today in Siem Reap? (particulate matter (PM10) suspended dust)
The current level of particulate matter PM10 in Siem Reap is: 2 (Good)

How is the O3 level today in Siem Reap? (ozone (O3))
46 (Good)

How high is the level of NO2? (nitrogen dioxide (NO2))
2 (Good)

What is the level of SO2 pollution? (sulfur dioxide (SO2))
0 (Good)

How high is the CO level? (carbon monoxide (CO))
139 (Good)

Current data Thursday, August 27, 2026 at 8:00 AM

PM2,5 2 (Good)

PM10 2 (Good)

O3 46 (Good)

NO2 2 (Good)

SO2 0 (Good)

CO 139 (Good)

Data on air pollution from recent days in Siem Reap

index	2026-08-27	2026-08-26	2026-08-25	2026-08-24	2026-08-23	2026-08-22	2026-08-21	2026-08-20
pm25	3 Good	6 Good	6 Good	4 Good	6 Good	4 Good	6 Good	2 Good
pm10	4 Good	8 Good	8 Good	6 Good	8 Good	6 Good	9 Good	3 Good
o3	52 Good	47 Good	47 Good	51 Good	54 Good	51 Good	52 Good	52 Good
no2	1 Good	2 Good	2 Good	2 Good	2 Good	1 Good	2 Good	2 Good
so2	0 Good	1 Good	1 Good	1 Good	1 Good	0 Good	1 Good	0 Good
co	132 Good	132 Good	135 Good	125 Good	128 Good	130 Good	125 Good	132 Good

data source »

Quality of life in Siem Reap

Green and Parks in the City

Siem Reap 42%

Vietnam: 42% Thailand: 42% laoPDR: 37% Malaysia: 54% Singapore: 80%

Pleasure of spending time in the city

Siem Reap 42%

Vietnam: 30% Thailand: 37% laoPDR: 38% Malaysia: 48% Singapore: 74%

Air Pollution

Siem Reap 42%

Vietnam: 78% Thailand: 71% laoPDR: 72% Malaysia: 53% Singapore: 34%

Garbage Disposal

Siem Reap 25%

Vietnam: 24% Thailand: 41% laoPDR: 20% Malaysia: 47% Singapore: 76%

Availability and quality of drinking water

Siem Reap 21%

Vietnam: 43% Thailand: 49% laoPDR: 51% Malaysia: 56% Singapore: 85%

Cleanliness and tidiness

Siem Reap 33%

Vietnam: 29% Thailand: 38% laoPDR: 32% Malaysia: 47% Singapore: 81%

Noise and Light pollution

Siem Reap 58%

Vietnam: 65% Thailand: 57% laoPDR: 55% Malaysia: 49% Singapore: 50%

Water Pollution

Siem Reap 88%

Vietnam: 73% Thailand: 69% laoPDR: 73% Malaysia: 62% Singapore: 25%

Source: Numbeo

Siem Reap

Thursday, August 27, 2026 at 8:00 AM

PM2,5 1.8 (Good)

particulate matter (PM2.5) dust

PM10 2.4 (Good)

particulate matter (PM10) suspended dust

O3 46 (Good)

ozone (O3)

NO2 1.5 (Good)

nitrogen dioxide (NO2)

SO2 0.4 (Good)

sulfur dioxide (SO2)

CO 139 (Good)

carbon monoxide (CO)

Siem Reap

index	2026-08-20	2026-08-21	2026-08-22	2026-08-23	2026-08-24	2026-08-25	2026-08-26	2026-08-27
pm25	2.5	5.9	4	6	4.2	5.8	5.8	3.3
pm10	3.2	8.6	5.5	8.3	6	8.4	8.3	4.4
o3	52	52	51	54	51	47	47	52
no2	1.7	1.6	1.5	1.6	1.5	1.7	1.6	1.4
so2	0.48	0.54	0.48	0.53	0.61	0.75	0.62	0.46
co	132	125	130	128	125	135	132	132

* Pollution data source: https://openaq.org () The data is licensed under CC-By 4.0

🌦️ Weather · 16-day Forecast — Cambodia

16-day weather forecast for Cambodia: today around 35°C (cloudy), lows near 25°C. Daily temperature and conditions, updated every day. Strong wind (about 27 km/h) is actively clearing smog and dust away.

☀️ UV Index · 16-day Forecast — Cambodia

The UV index in Cambodia today is 7.5 (high) — unprotected fair skin can burn in about 25 minutes.

📍 Air quality in nearby cities

Live PM2.5 around Siem Reap — compare nearby locations.

Phnom Penh 6 µg/m³
Kampong Saom 7 µg/m³
Battambang 3 µg/m³

Frequently asked questions

Is the air safe to breathe in Siem Reap today?

The current average PM2.5 across Siem Reap is about 2 µg/m³, rated “Good”. Air quality is good — outdoor activities are fine for everyone.

What is the current PM2.5 level in Siem Reap?

Right now PM2.5 in Siem Reap averages about 2 µg/m³ (“Good”). PM2.5 are fine particles small enough to reach the lungs and bloodstream.

Which day last week had the worst air in Siem Reap?

Over the past week, the highest daily PM2.5 in Siem Reap was recorded on Sunday, August 23 (about 6 µg/m³).

What is the UV index in Siem Reap today?

The UV index in Siem Reap today is 7.5 (high) — unprotected fair skin can burn in about 25 minutes.

Does today's wind help disperse smog in Siem Reap?

Strong wind (about 27 km/h) is actively clearing smog and dust away.

How is air quality measured?

Air quality here is based on PM2.5 — the concentration of fine particulate matter in µg/m³. Lower values mean cleaner air. Data is updated daily from Open-Meteo.