What is the air quality in Phnom Penh?

Phnom Penh, Cambodia has an annual US AQI of 73 (Polluted) and average PM2.5 of 21.1 µg/m³, ranking #3442 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Phnom Penh?

August is typically the cleanest month (AQI 54) and January the most polluted (AQI 105).

Where does Phnom Penh's air quality data come from?

PM2.5: 1998–2026 (low-cost sensors 2025–2026, satellite 1998–2024). From calibrated low-cost sensors, because no government monitor covers the city. Full sources are on the methodology page.

Phnom Penh, Cambodia — Air Quality & Clean City Guide 2026

Phnom Penh Air Quality Data

Global rank	City	Continent	AQI	PM2.5
3442	Phnom Penh, Cambodia	Asia	AQI 73	PM2.5 21.1 µg/m³