20. Detroit, USA
Real-time AQI (2024): 23
Detroit is ranked as one of the cleanest cities in the world. As of April 26, the city's air quality index was 23. PM2.5 concentrations were 5.5 micrograms per cubic meter.
19. Los Angeles, USA
Real-time AQI (2024): 21
Los Angeles has an AQI of 21 and a PM2.5 concentration of 5 mcg/m3. It is ranked 19th on our list of cities with cleanest air quality.
18. Washington, D.C., USA
Real-time AQI (2024): 21
Washington is number 18 on our list. As of April 26, the AQI was 21. The concentration of fine particulate matter is 5 μg/m3.
17. Toronto, Canada
Real-time AQI (2024): 20
Toronto is number 17 on our list. PM2.5 concentration was 4.6 micrograms per cubic meter. Other major pollutants reported by the city include O3 and NO2.
16. Helsinki, Finland
Real-time AQI (2024): 20
Helsinki ranks 16th among the cleanest cities in the world. As of April 26, the AQI was 20. PM2.5 concentrations were 3.6 micrograms per cubic meter.
15. Sydney, Australia
Real-time AQI (2024): 19
Sydney is number 15 on our list. As of April 26, the city's air quality index was 19. PM2.5 concentrations were 4.5 micrograms per cubic meter.
14. Houston, USA
Real-time AQI (2024): 18
As of April 26, Houston had an air quality index of 18 and a PM2.5 concentration of 4.4 micrograms per cubic meter, making it one of the cleanest cities in the world.
13. Canberra, Australia
Real-time AQI (2024): 18
Canberra is ranked 13th on our list of cities with the cleanest air in the world. The city has an air quality index of 18. The PM2.5 concentration was 3.1 micrograms per cubic meter and the PM10 concentration was 19.3 micrograms per cubic meter.
12. Athens, Greece
Real-time AQI (2024): 17
Athens is the capital of Greece. PM2.5 concentrations were 4.5 micrograms per cubic meter. It is the 12th cleanest city in the world for air quality.
11. Melbourne, Australia
Real-time AQI (2024): 17
As of April 26, Melbourne was ranked 11th on our list, with an air quality index of 17 and a PM2.5 concentration of 4.1 μg/m3. It is one of the cleanest cities in the world.
10. Zagreb, Croatia
Real-time AQI (2024): 17
Another city with the cleanest air quality in the world is Zagreb. The PM2.5 concentration was 4 micrograms per cubic meter and the PM10 concentration was 5.4 micrograms per cubic meter.
9. Krakow, Poland
Real-time AQI (2024): 17
Krakow is a city in southern Poland. As of April 26, the AQI was 17. PM2.5 concentrations were 4 micrograms per cubic meter. It ranks ninth on our list of the cleanest cities in the world.
8. Dublin, Ireland
Real-time AQI (2024): 12
Dublin has one of the cleanest air in the world. The PM2.5 concentration was 3 micrograms per cubic meter and the PM10 concentration was 6.7 micrograms per cubic meter.
7. Stockholm, Sweden
Real-time AQI (2024): 12
Stockholm, the capital and one of the largest cities in Sweden, had PM2.5 concentrations of 3 micrograms per cubic meter and PM10 concentrations of 4.1 micrograms per cubic meter as of April 26. It is number seven on our list.
6. Denver, USA
Real-time AQI (2024): 9
Denver is the capital of the U.S. state of Colorado. As of April 26, the city's air quality index was 9. With a PM2.5 concentration of 2.3 micrograms per cubic meter, it ranks sixth on our list of the world's cleanest cities with the air.
5. Salt Lake City, USA
Real-time AQI (2024): 9
Salt Lake City is rated as one of the cleanest cities in the world. As of April 26, the city's air quality index was 9 and the PM2.5 concentration was 2.1 micrograms per cubic meter.
4. Auckland, New Zealand
Real-time AQI (2024): 5
Auckland is a city located on the North Island of New Zealand. As of April 26, it is one of the cleanest cities in the world, with an air quality index of 5. PM2.5 concentrations were 1.1 micrograms per cubic meter.
3. Vancouver, British Columbia, Canada
Real-time AQI (2024): 4
Vancouver is one of the largest cities in British Columbia. As of April 26, the city's real-time air quality was 4 and PM2.5 concentrations were 1 micrograms per cubic meter. It is one of the cleanest cities in the world.
2. Seattle, USA
Real-time AQI (2024): 3
Seattle is a city in the US state of Washington with a real-time air quality index of 3 as of April 26. PM2.5 concentrations are as low as 0.8 micrograms per cubic meter.
1. Portland, USA
Real-time AQI (2024): 3
Portland tops our list of cities with the cleanest air in the world. As of April 26, the city's air quality index was 3 and PM2.5 concentrations were 0.7 micrograms per cubic meter.