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Cleanest cities in the world66Moderate

Live · world ranking

66
AQI · US scale
Moderate

The freshest-air world cities of 46 reporting right now.

Rankings › Cleanest cities in the world

Cleanest Cities in the World Right Now

The cleanest major cities worldwide right now, ranked by lowest live US AQI from OpenAQ station data.

Right now (Sep 2026)

Right now the cleanest world city we track is Phnom Penh at US AQI 3 (Good).

Good 0–50Satisfactory 51–100Moderate 101–200Poor 201–300Very Poor 301–400Severe 401–500

World cities ranked by live US AQI (cleanest first)

1 Phnom PenhCambodia GoodPM2.5 3 2 AucklandNew Zealand GoodPM2.5 4 3 DenverUnited States GoodPM2.5 11 4 YangonMyanmar GoodPM2.5 12 5 New YorkUnited States GoodPM2.5 13 6 AthensGreece GoodPM10 17 7 KrakowPoland GoodPM10 20 8 TorontoCanada GoodPM2.5 22 9 BusanSouth Korea GoodPM2.5 22 10 WashingtonUnited States GoodPM2.5 22 11 PokharaNepal GoodPM2.5 23 12 SofiaBulgaria GoodPM2.5 26 13 Buenos AiresArgentina GoodPM10 28 14 SkopjeNorth Macedonia GoodPM2.5 32 15 VancouverCanada GoodPM2.5 32 16 LondonUnited Kingdom GoodPM2.5 33 17 TokyoJapan GoodPM2.5 33 18 JohannesburgSouth Africa GoodPM2.5 39 19 ChicagoUnited States GoodPM2.5 43 20 SeattleUnited States GoodPM2.5 49 21 San FranciscoUnited States GoodPM2.5 50 22 Cape TownSouth Africa ModeratePM2.5 52 23 BelgradeSerbia ModeratePM2.5 53 24 OsakaJapan ModeratePM2.5 55 25 TaipeiTaiwan ModeratePM2.5 57 26 LimaPeru ModeratePM2.5 57 27 Hong KongHong Kong ModeratePM2.5 58 28 Chiang MaiThailand ModeratePM2.5 63 29 SeoulSouth Korea ModeratePM2.5 64 30 DubaiUnited Arab Emirates ModeratePM2.5 66 31 AmsterdamNetherlands ModeratePM2.5 66 32 RiyadhSaudi Arabia ModeratePM2.5 67 33 BangkokThailand ModeratePM2.5 68 34 Kuwait CityKuwait ModeratePM2.5 68 35 CebuPhilippines ModeratePM2.5 76 36 SantiagoChile ModeratePM2.5 79 37 KathmanduNepal Unhealthy for Sensitive GroupsPM2.5 104 38 Kuala LumpurMalaysia Unhealthy for Sensitive GroupsPM2.5 109 39 FaisalabadPakistan UnhealthyPM2.5 158 40 GujranwalaPakistan UnhealthyPM2.5 158 41 KampalaUganda UnhealthyPM2.5 158 42 IslamabadPakistan UnhealthyPM2.5 159 43 RawalpindiPakistan UnhealthyPM2.5 159 44 SialkotPakistan UnhealthyPM2.5 170 45 PeshawarPakistan UnhealthyPM2.5 174 46 LahorePakistan UnhealthyPM2.5 196

About the world’s cleanest cities

These are the cleanest-air major world cities on live OpenAQ data, US EPA scale, updated hourly. Coastal cities and those with strong environmental regulation and mild, windy climates typically lead. Rankings reflect the current hour — open any city for its full report.

Frequently asked questions

Which is the cleanest city in the world right now?

Phnom Penh currently has the cleanest air among the world cities we track at US AQI 3.

Which AQI scale is this?

The US EPA AQI scale, so cities are comparable across countries.

How often does it update?

Hourly, from live OpenAQ station data.

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