Worst air pollution Phnom Penh, today and tomorrow
Today (10 August): Air quality in Phnom Penh is good. AQI, PM2.5, PM10, NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 5:00 AM (NO2: 16.4/100).
Tomorrow (11 August 2026): Air quality in Phnom Penh is good. All pollutants stay as today. Pollution peaks around 1:00 PM (O3: 14.9/100). Airmine updates local air quality forecasts four times daily.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Phnom Penh's air quality reflects the flat Mekong and Tonle Sap river confluence's Cambodian delta position, with vehicle traffic on surrounding expressways and the garment manufacturing, construction, and brick kiln corridor contributing local sources. The Mekong's flat alluvial plain allows reasonable monsoon season dispersal, while the dry season northeast monsoon and regional biomass burning from Cambodian and Vietnamese agricultural fires contribute seasonal PM2.5 elevation throughout the year.
Today - 10 August | Pollution peaks at 05:00
AQI:
Good
16.4/100
PM2.5 (fine particles):
Good
5.0/100
PM10 (coarse particles):
Good
1.7/100
NO2 (nitrogen dioxide):
Good
16.4/100
O3 (ozone):
Good
14.0/100
SO2 (sulfur dioxide):
Good
4.6/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
7.1/100
PM1 (ultrafine particles):
Good
5.9/100
Levels show the poorest local air quality during the day
Tomorrow - 11 August | Pollution peaks at 13:00
AQI:
Good
14.9/100
PM2.5 (fine particles):
Good
4.6/100
PM10 (coarse particles):
Good
1.4/100
NO2 (nitrogen dioxide):
Good
14.2/100
O3 (ozone):
Good
14.9/100
SO2 (sulfur dioxide):
Good
4.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
8.1/100
PM1 (ultrafine particles):
Good
5.4/100
Frequently Asked Questions
Is air quality bad in Phnom Penh right now?
On 10 August 2026, overall air quality in Phnom Penh is good. AQI is the main air quality indicator at 16.4/100. Pollution peaks around 5:00 AM (NO2: 16.4/100).
Will air quality be worse tomorrow in Phnom Penh?
On 11 August 2026, air quality conditions in Phnom Penh will be similar to today, with AQI forecast at good at 14.9/100. Pollution peaks around 1:00 PM (O3: 14.9/100).
When is air pollution at its worst in Phnom Penh?
The biggest local contributors to pollution in Phnom Penh are vehicle traffic, manufacturing and food processing, as well as construction dust, particularly once conditions turn dry between monsoons. The wet season generally clears the air, while the dry season lets levels build back up. Air quality typically improves markedly once the rains arrive.
Are air quality levels in Phnom Penh based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
Why doesn’t the forecast always reflect wildfire impacts?
Airmine’s forecast uses CAMS (Copernicus Atmosphere Monitoring Service) as its background atmospheric model. While CAMS includes wildfire emissions, these are derived from satellite observations and are not available in real time. During rapidly evolving wildfire events, there may therefore be a delay before increased emissions are incorporated into the model. As a result, the forecast may temporarily underestimate PM₂.₅ and other pollutants associated with wildfire smoke.
During rapidly evolving wildfire events, CAMS may lag by approximately 1–2 days before increased wildfire emissions are fully represented, which can lead to temporary underestimation of PM₂.₅ concentrations in Airmine’s forecast.
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Data provided by Airmine — Last update: 9 August 2026 at 20:27 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.
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