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Phnom Penh air quality

Cambodia · Live AQI and hourly forecast for the next 5 days · updated Sun 07:00 local time

59

Moderate

US AQI, mostly PM2.5

Acceptable. Unusually sensitive people should ease off long, intense outdoor effort.

Next 24 hours
59–65US AQI, highest around Sun 18:00
Best time outside
Sun 07:00–10:00US AQI about 60
PM2.5 vs WHO guideline
0.9×14 µg/m³ over 24 h, guideline 15
Cigarette equivalent
≈ 0.6 a dayBerkeley Earth rule of thumb
European AQI
Moderatelevel 3 of 6

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The live globe, centred on Phnom Penh. Switch pollutants, drag through the next 5 days or press play. Full map →

Pollutants in Phnom Penh right now

PollutantNowNext 24 h vs WHOUS AQI band
Fine particles (PM2.5) 23 µg/m³ 0.9× Moderate
Coarse particles (PM10) 25 µg/m³ 0.3× Good
Nitrogen dioxide (NO2) 9.7 µg/m³ 0.2× Good
Ozone (O3) 43 µg/m³ 0.8× Good
Sulphur dioxide (SO2) 7.8 µg/m³ 0.1× Good
Carbon monoxide (CO) 253 µg/m³ 0.1× Good
Desert dust0 µg/m³
Smoke and haze (aerosol optical depth)0.43
UV index0.4

“Next 24 h vs WHO” compares the forecast with the World Health Organization’s 2021 guideline levels: 24-hour means of 15 µg/m³ for PM2.5, 45 for PM10, 25 for NO2, 40 for SO2 and 4 mg/m³ for CO, and 100 µg/m³ over 8 hours for ozone. Above 1× is above the guideline.

Next 48 hours

Hourly US AQI. Highest 65 around Sun 18:00, lowest 53 around Mon 18:00.

Good 0–50Moderate 51–100Sensitive 101–150Unhealthy 151–200Very unhealthy 201–300Hazardous 301+

5-day air quality forecast for Phnom Penh

Daily range of the hourly US AQI, from lowest to highest, on a scale of 0 to 150.

DayUS AQIAt worstWorst hourPM2.5 avgUV max
Sun 27 Sept 52–65 Moderate 18:00 17 9.6
Mon 28 Sept 53–64 Moderate 0:00 11 9.8
Tue 29 Sept 54–64 Moderate 19:00 16 10
Wed 30 Sept 63–65 Moderate 6:00 15 9.4
Thu 1 Oct 53–62 Moderate 0:00 11 6.9

Common questions about the air in Phnom Penh

  1. Is the air in Phnom Penh safe today?

    For most people, yes. Right now the US AQI in Phnom Penh is 59, which counts as moderate. Acceptable. Unusually sensitive people should ease off long, intense outdoor effort.

  2. When is the best time to be outside in Phnom Penh?

    Sun 07:00–10:00. That is the cleanest stretch in the next 24 hours, with the US AQI averaging about 60. The worst hour is around Sun 18:00, at 65.

  3. What is the main pollutant in Phnom Penh?

    Fine particles (PM2.5). It drives the index right now, at 23 µg/m³. Tiny particles from combustion, fires and dust that reach deep into the lungs. The main driver of AQI worldwide.

  4. How does Phnom Penh's air compare with the WHO guideline?

    Within the guideline. Over the next 24 hours PM2.5 averages about 14 µg/m³, against the World Health Organization's 24-hour guideline of 15 µg/m³. The other pollutants stay within their guideline levels.

  5. How many cigarettes is a day of Phnom Penh's air?

    About 0.6 cigarettes. Over the next 24 hours PM2.5 averages about 14 µg/m³. By Berkeley Earth's rule of thumb, 22 µg/m³ breathed for a day is roughly one cigarette.

  6. Will air quality in Phnom Penh improve this week?

    Thursday looks cleanest. Its AQI peaks at 62, against 65 on Sunday, the worst day in the forecast.

Air quality near Phnom Penh

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About this forecast

Forecast from CAMS global via Open-Meteo: the Copernicus Atmosphere Monitoring Service (CAMS) model at about 40 km resolution (10 km inside Europe), refreshed twice a day. Models smooth out street-level peaks, so busy roads and industrial sites can be worse than shown; ground stations, where there are any nearby, show what monitors actually measure. The US AQI follows the US EPA scale and the European AQI the EEA bands. Readings for 11.56°N, 104.93°E, updated 2026-09-27 00:00 UTC.