Daily report · 17 October 2026
World air quality on 17 October 2026
On 17 October 2026 at 12:00 UTC, Pekanbaru, Indonesia had the most polluted air of any monitored city, at US AQI 416 (Hazardous). Manaus, Brazil (319) and Singapore, Singapore (250) followed. Indonesia had 5 of the 20 most polluted cities. The day before, Padang topped the list at 500. The cleanest air was in Cleveland, United States (2).
20 most polluted cities
- 416PekanbaruIndonesia · Hazardous
- 319ManausBrazil · Hazardous
- 250SingaporeSingapore · Very Unhealthy
- 234PalembangIndonesia · Very Unhealthy
- 216Johor BahruMalaysia · Very Unhealthy
- 213HoniaraSolomon Islands · Very Unhealthy
- 207PadangIndonesia · Very Unhealthy
- 206BatamIndonesia · Very Unhealthy
- 204BanjarmasinIndonesia · Very Unhealthy
- 201Kuala LumpurMalaysia · Very Unhealthy
- 170MilanItaly · Unhealthy
- 170GhaziabadIndia · Unhealthy
- 162BergamoItaly · Unhealthy
- 161DhakaBangladesh · Unhealthy
- 160DelhiIndia · Unhealthy
- 159JalandharIndia · Unhealthy
- 158Kuwait CityKuwait · Unhealthy
- 158NoidaIndia · Unhealthy
- 155IpohMalaysia · Unhealthy
- 154Pimpri-ChinchwadIndia · Unhealthy
20 cleanest cities
- 2ClevelandUnited States · Good
- 3SaltilloMexico · Good
- 6OttawaCanada · Good
- 6TorontoCanada · Good
- 6HamiltonCanada · Good
- 6BostonUnited States · Good
- 6ColumbusUnited States · Good
- 6IndianapolisUnited States · Good
- 6DetroitUnited States · Good
- 6LeicesterUnited Kingdom · Good
- 7QuébecCanada · Good
- 7Frankfurt am MainGermany · Good
- 7MilwaukeeUnited States · Good
- 8MaleMaldives · Good
- 8CincinnatiUnited States · Good
- 8ChicagoUnited States · Good
- 9BremenGermany · Good
- 9SheffieldUnited Kingdom · Good
- 9Washington, D.C.United States · Good
- 10Buenos AiresArgentina · Good
US AQI from government and research monitoring stations, recorded at 12:00 UTC. Modelled estimates are excluded.