Cleanest Air Cities
Cities with the cleanest measured air quality among the global metros we track.
Air quality score is normalised from PM2.5, PM10, NO2 and ozone measurements. Higher scores rank higher.
This utility ranking is kept out of search indexing while the publication prioritizes longer-form editorial reports and city profiles.
Top 10 — Cleanest Air Cities
Zurich sits at #1 with an air-quality score of 90 — well above the typical major metro. Winter inversions and summer smog are largely absent here.
Adelaide rounds out the leaders with an air-quality score of 88 — well above the typical major metro. Winter inversions and summer smog are largely absent here.
Stockholm holds a top-three spot with an air-quality score of 88 — well above the typical major metro. Runners, cyclists and asthma sufferers all report noticeable quality-of-life gains.
Auckland secures a top-ten spot with an air-quality score of 88 — well above the typical major metro. Winter inversions and summer smog are largely absent here.
Perth makes the top ten with an air-quality score of 86 — well above the typical major metro. PM2.5 readings sit comfortably below WHO annual guidance.
Vancouver makes the top ten with an air-quality score of 86 — well above the typical major metro. PM2.5 readings sit comfortably below WHO annual guidance.
A top-ten placing for Brisbane with an air-quality score of 84 — well above the typical major metro. Both traffic and industrial pollutants are managed rather than tolerated.
Melbourne makes the top ten with an air-quality score of 82 — well above the typical major metro. PM2.5 readings sit comfortably below WHO annual guidance.
A top-ten placing for Montreal with an air-quality score of 82 — well above the typical major metro. Both traffic and industrial pollutants are managed rather than tolerated.
Sydney still ranks strongly with an air-quality score of 80 — well above the typical major metro. Runners, cyclists and asthma sufferers all report noticeable quality-of-life gains.
Full Ranking
- 1ZurichSwitzerland90
- 2AdelaideAustralia88
- 3StockholmSweden88
- 4AucklandNew Zealand88
- 5PerthAustralia86
- 6VancouverCanada86
- 7BrisbaneAustralia84
- 8MelbourneAustralia82
- 9MontrealCanada82
- 10SydneyAustralia80
- 11MiamiUnited States80
- 12TorontoCanada80
- 13DublinIreland80
- 14BostonUnited States78
- 15AustinUnited States78
- 16AmsterdamNetherlands78
- 17TokyoJapan78
- 18Cape TownSouth Africa78
- 19SeattleUnited States76
- 20BerlinGermany76
- 21SingaporeSingapore74
- 22San FranciscoUnited States72
- 23ChicagoUnited States72
- 24MadridSpain72
- 25BarcelonaSpain68
- 26Buenos AiresArgentina68
- 27New YorkUnited States66
- 28ParisFrance64
- 29Kuala LumpurMalaysia62
- 30LondonUnited Kingdom60
- 31DubaiUnited Arab Emirates60
- 32Los AngelesUnited States58
- 33Hong KongHong Kong SAR56
- 34BangkokThailand50
- 35Mexico CityMexico50
- 36MumbaiIndia38
What this ranking measures
The Cleanest Air Cities ranking is built on a single principle: pick the indicator that most directly captures the underlying question, normalise it to a 0-100 scale, and rank consistently. Air quality score is normalised from PM2.5, PM10, NO2 and ozone measurements. The ranking is recomputed every time the underlying city dataset changes, so the order you see is always derived from the current numbers — not a cached editorial opinion.
The ranking includes every city we cover, so the leaderboard mixes premium global metros with mid-tier and affordable alternatives. That is deliberate: the goal is not to crown the "richest" city — it is to surface the city that most cleanly satisfies the criterion in the title.
Top three in depth
1. Zurich, Switzerland. Financial centre with the world's highest salaries — and matching costs. On the metrics that drive this ranking, Zurich pairs a livability score of 92 with a job market score of 86 and a safety score of 92. Cost-of-living index 90, 1BR rent $2,700. This is the city to beat in cleanest air cities.
2. Adelaide, Australia. Compact, affordable, wine-country capital with a slower pace and excellent schools. Close behind on the ranked dimension while differentiating on affordability (lifestyle 80, cost 58, rent $1,450).
3. Stockholm, Sweden. Island-spread Nordic capital — design, equality, long winters, beautiful summers. Rounds out the podium with a credible scorecard — livability 86, transport 90, climate 56, cost index 72.
How to use this ranking
Rankings are useful for shortlisting, not for deciding. A top-10 finish here means a city clears the bar on this dimension — but the right city for you depends on the basket of dimensions, weighted to your life. Use this list to draw a shortlist of three to five cities, then run each through our cost-of-living calculator, comparison tool, and suburb guide before committing.
Pay particular attention to the trade-offs. The top performers on this dimension sometimes underperform on cost-of-living or housing. The point of cross-checking against our other rankings is to make those trade-offs visible before you sign a lease.
Frequently Asked Questions
How is the cleanest air cities ranking calculated?
Air quality score is normalised from PM2.5, PM10, NO2 and ozone measurements. Cities with higher scores rank higher. Scores are normalised to a 0-100 scale and updated alongside the underlying source data.
Which city ranks #1 for cleanest air cities?
Zurich, Switzerland currently leads this ranking with a score of 90.
How often is the ranking updated?
Underlying city data is refreshed quarterly. Major changes (significant rent shifts, safety events, new transport infrastructure) trigger off-cycle updates documented in our methodology page.