The world's most polluted cities, ranked

478 of 2,624 measured cities in 86 countries breathed air above the WHO 24-hour guideline of 15 µg/m³ over the last 30 days. The worst was Miryang, South Korea, at 307.9.

#870 Yasothon 8.4 µg/m³, more polluted than 66% of 2,624
← Miryang 307.9 WHO 24-hour guideline
Every ranked city, one column each, worst on the left and cleanest on the right. Point at it to read a city; tap to open it.
  1. 1MiryangGyeongsangnam-do, South Korea 307.9
  2. 2HwasunJeollanam-do, South Korea 287.9
  3. 3NangenJeollabuk-do, South Korea 248.9
  4. 4SeosanChungcheongnam-do, South Korea 224.6
  5. 5GaigeturiJeju-do, South Korea 195.2
  6. 6Hwaseong-siGyeonggi-do, South Korea 182.7
  7. 7Taesal-liChungcheongnam-do, South Korea 176.6
  8. 8KosongGangwon-do, South Korea 171.4
  9. 9SeogwipoJeju-do, South Korea 168.9
  10. 10AnseongGyeonggi-do, South Korea 165.3
  11. 11SinhyeonGyeongsangnam-do, South Korea 143.3
  12. 12NonsanChungcheongnam-do, South Korea 135.7
  13. 13ChangsuJeollabuk-do, South Korea 128.5
  14. 14MokpoJeollanam-do, South Korea 127.0
  15. 15KimjeJeollabuk-do, South Korea 126.8
  16. 16JeongeupJeollabuk-do, South Korea 125.8
  17. 17HadongGyeongsangnam-do, South Korea 125.3
  18. 18Yangp'yŏngGyeonggi-do, South Korea 124.8
  19. 19CheorwonGangwon-do, South Korea 124.1
  20. 20KunwiGyeongsangbuk-do, South Korea 123.1
  21. 21GeojeGyeongsangnam-do, South Korea 114.3
  22. 22ChinjuGyeongsangnam-do, South Korea 112.5
  23. 23YesanChungcheongnam-do, South Korea 111.3
  24. 24PubalGyeonggi-do, South Korea 110.8
  25. 25BuanJeollabuk-do, South Korea 110.5
  26. 26YeojuGyeonggi-do, South Korea 110.3
  27. 27YŏnmuChungcheongnam-do, South Korea 108.8
  28. 28NamsaJeollabuk-do, South Korea 108.3
  29. 29YangsanGyeongsangnam-do, South Korea 107.0
  30. 30BuyeoChungcheongnam-do, South Korea 106.3
  31. 30HwawŏnDaegu, South Korea 106.3
  32. 32GunsanJeollabuk-do, South Korea 103.3
  33. 33TangjinChungcheongnam-do, South Korea 101.0
  34. 34GangneungGangwon-do, South Korea 99.0
  35. 35Cheongju-siNorth Chungcheong, South Korea 97.1
  36. 36YeonggwangJeollanam-do, South Korea 96.2
  37. 37YecheonGyeongsangbuk-do, South Korea 95.5
  38. 38JungpyongNorth Chungcheong, South Korea 95.3
  39. 39Ganghwa-gunIncheon, South Korea 95.2
  40. 40KoesanNorth Chungcheong, South Korea 95.1
  41. 41GoseongGyeongsangnam-do, South Korea 95.0
  42. 42YeongdongNorth Chungcheong, South Korea 94.9
  43. 42YangjuGyeonggi-do, South Korea 94.9
  44. 42BoryeongChungcheongnam-do, South Korea 94.9
  45. 45JangheungJeollanam-do, South Korea 92.0
  46. 46Jeju CityJeju-do, South Korea 91.9
  47. 47Koch'angJeollabuk-do, South Korea 90.6
  48. 48Icheon-siGyeonggi-do, South Korea 90.5
  49. 49MuanJeollanam-do, South Korea 89.6
  50. 50HongseongChungcheongnam-do, South Korea 89.3
All 2,624 cities
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+

PM2.5 in µg/m³, coloured by the US EPA's PM2.5 categories. Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

Who led, day by day

Hwasun2 days #12026-09-02: 424.0 µg/m³2026-09-03: 13.4 µg/m³2026-09-04: 8.0 µg/m³2026-09-05: 422.0 µg/m³, #52026-09-06: 1,260.0 µg/m³, #12026-09-07: 12.2 µg/m³2026-09-08: 11.8 µg/m³2026-09-09: 9.9 µg/m³2026-09-10: 839.0 µg/m³, #42026-09-11: 426.0 µg/m³2026-09-12: 843.0 µg/m³, #22026-09-13: 844.0 µg/m³, #12026-09-14: 845.0 µg/m³, #82026-09-15: 433.0 µg/m³2026-09-16: 15.4 µg/m³2026-09-17: 423.0 µg/m³2026-09-18: 424.0 µg/m³2026-09-19: 425.0 µg/m³, #32026-09-20: 425.0 µg/m³, #32026-09-21: 428.0 µg/m³2026-09-22: 12.6 µg/m³2026-09-23: 12.1 µg/m³2026-09-24: 10.4 µg/m³2026-09-25: 17.3 µg/m³2026-09-26: 5.8 µg/m³2026-09-27: 8.1 µg/m³2026-09-28: 10.8 µg/m³2026-09-29: 10.9 µg/m³2026-09-30: 10.0 µg/m³2026-10-01: 8.3 µg/m³Miryang2 days #12026-09-02: 1,260.0 µg/m³, #32026-09-03: 15.8 µg/m³2026-09-04: 7.3 µg/m³2026-09-05: 5.4 µg/m³2026-09-06: 10.3 µg/m³2026-09-07: 12.5 µg/m³2026-09-08: 7.1 µg/m³2026-09-09: 840.0 µg/m³, #72026-09-10: 423.0 µg/m³2026-09-11: 839.0 µg/m³2026-09-12: 425.0 µg/m³, #52026-09-15: 14.4 µg/m³2026-09-16: 842.0 µg/m³2026-09-17: 5.8 µg/m³2026-09-18: 1,260.0 µg/m³, #12026-09-19: 842.0 µg/m³, #22026-09-20: 842.0 µg/m³, #12026-09-21: 844.0 µg/m³, #72026-09-22: 10.6 µg/m³2026-09-23: 8.0 µg/m³2026-09-24: 15.3 µg/m³2026-09-25: 19.6 µg/m³2026-09-26: 10.2 µg/m³2026-09-27: 11.0 µg/m³2026-09-28: 15.9 µg/m³2026-09-29: 14.0 µg/m³2026-09-30: 9.8 µg/m³2026-10-01: 11.4 µg/m³Gurugram2 days #12026-09-02: 48.7 µg/m³2026-09-03: 46.3 µg/m³2026-09-04: 30.4 µg/m³2026-09-05: 28.9 µg/m³2026-09-06: 33.2 µg/m³2026-09-07: 45.1 µg/m³2026-09-08: 28.8 µg/m³2026-09-09: 52.3 µg/m³2026-09-10: 82.9 µg/m³2026-09-11: 66.4 µg/m³2026-09-12: 33.5 µg/m³2026-09-13: 24.3 µg/m³2026-09-14: 38.2 µg/m³2026-09-15: 44.2 µg/m³2026-09-16: 31.0 µg/m³2026-09-17: 33.4 µg/m³2026-09-18: 34.3 µg/m³2026-09-19: 111.0 µg/m³, #102026-09-20: 122.9 µg/m³, #92026-09-21: 160.5 µg/m³2026-09-22: 165.1 µg/m³, #42026-09-23: 170.0 µg/m³, #12026-09-24: 112.2 µg/m³, #22026-09-25: 47.2 µg/m³2026-09-26: 57.0 µg/m³2026-09-27: 60.9 µg/m³2026-09-28: 104.0 µg/m³, #12026-09-29: 20.5 µg/m³Kinshasa2 days #12026-09-02: 70.1 µg/m³2026-09-03: 43.2 µg/m³2026-09-04: 73.1 µg/m³2026-09-05: 51.9 µg/m³2026-09-06: 78.5 µg/m³2026-09-07: 111.2 µg/m³2026-09-08: 138.0 µg/m³2026-09-09: 58.3 µg/m³2026-09-10: 70.7 µg/m³2026-09-11: 83.0 µg/m³2026-09-12: 70.9 µg/m³2026-09-14: 86.5 µg/m³2026-09-15: 102.1 µg/m³2026-09-16: 51.1 µg/m³2026-09-17: 56.0 µg/m³2026-09-18: 72.4 µg/m³2026-09-19: 71.9 µg/m³2026-09-20: 73.4 µg/m³2026-09-21: 71.2 µg/m³2026-09-23: 113.0 µg/m³, #32026-09-24: 151.0 µg/m³, #12026-09-25: 114.0 µg/m³, #12026-09-26: 65.6 µg/m³2026-09-27: 50.1 µg/m³2026-09-28: 58.2 µg/m³2026-09-30: 75.5 µg/m³, #42026-10-01: 49.9 µg/m³, #10Gujranwala2 days #12026-09-02: 48.3 µg/m³2026-09-03: 50.9 µg/m³2026-09-04: 45.9 µg/m³2026-09-05: 63.5 µg/m³2026-09-06: 51.0 µg/m³2026-09-07: 69.1 µg/m³2026-09-08: 80.0 µg/m³2026-09-09: 65.9 µg/m³2026-09-10: 49.4 µg/m³2026-09-11: 58.0 µg/m³2026-09-12: 59.6 µg/m³2026-09-13: 77.4 µg/m³, #72026-09-14: 46.7 µg/m³2026-09-15: 45.1 µg/m³2026-09-16: 55.2 µg/m³2026-09-17: 34.1 µg/m³2026-09-18: 46.2 µg/m³2026-09-19: 89.2 µg/m³2026-09-20: 87.6 µg/m³2026-09-21: 130.0 µg/m³2026-09-22: 108.5 µg/m³, #62026-09-23: 104.0 µg/m³, #42026-09-24: 96.4 µg/m³, #52026-09-25: 83.0 µg/m³, #62026-09-26: 67.8 µg/m³, #102026-09-27: 105.5 µg/m³, #12026-09-28: 53.9 µg/m³2026-09-29: 52.5 µg/m³2026-09-30: 81.0 µg/m³, #32026-10-01: 104.0 µg/m³, #1Yesan1 day #12026-09-02: 1,270.0 µg/m³, #12026-09-03: 21.0 µg/m³2026-09-04: 7.9 µg/m³2026-09-05: 7.7 µg/m³2026-09-06: 6.2 µg/m³2026-09-07: 8.9 µg/m³2026-09-08: 16.4 µg/m³2026-09-09: 840.0 µg/m³, #62026-09-10: 7.9 µg/m³2026-09-11: 11.0 µg/m³2026-09-12: 22.2 µg/m³2026-09-13: 26.0 µg/m³2026-09-14: 21.9 µg/m³2026-09-15: 11.3 µg/m³2026-09-16: 13.3 µg/m³2026-09-17: 7.6 µg/m³2026-09-18: 840.0 µg/m³, #62026-09-19: 9.9 µg/m³2026-09-20: 14.0 µg/m³2026-09-21: 17.9 µg/m³2026-09-22: 17.3 µg/m³2026-09-23: 19.3 µg/m³2026-09-24: 19.6 µg/m³2026-09-25: 20.5 µg/m³2026-09-26: 10.7 µg/m³2026-09-27: 13.3 µg/m³2026-09-28: 17.0 µg/m³2026-09-29: 18.6 µg/m³2026-09-30: 17.2 µg/m³2026-10-01: 5.8 µg/m³Gaigeturi1 day #12026-09-02: 1,260.0 µg/m³, #52026-09-03: 1,260.0 µg/m³, #12026-09-04: 632.0 µg/m³, #62026-09-05: 5.5 µg/m³2026-09-06: 8.5 µg/m³2026-09-07: 12.3 µg/m³2026-09-08: 9.8 µg/m³2026-09-09: 425.3 µg/m³2026-09-10: 5.7 µg/m³2026-09-11: 215.0 µg/m³2026-09-12: 7.8 µg/m³2026-09-13: 6.6 µg/m³2026-09-14: 1,260.0 µg/m³, #22026-09-15: 8.6 µg/m³2026-09-16: 9.5 µg/m³2026-09-17: 628.3 µg/m³2026-09-18: 5.7 µg/m³2026-09-19: 8.2 µg/m³2026-09-20: 6.8 µg/m³2026-09-21: 11.7 µg/m³2026-09-22: 8.4 µg/m³2026-09-23: 6.3 µg/m³2026-09-24: 9.3 µg/m³2026-09-25: 9.7 µg/m³2026-09-26: 5.5 µg/m³2026-09-27: 3.7 µg/m³2026-09-28: 6.7 µg/m³2026-09-29: 5.6 µg/m³2026-09-30: 7.3 µg/m³2026-10-01: 6.4 µg/m³Yecheon1 day #12026-09-02: 421.0 µg/m³2026-09-03: 6.3 µg/m³2026-09-04: 1,260.0 µg/m³, #12026-09-05: 5.0 µg/m³2026-09-06: 7.6 µg/m³2026-09-07: 10.0 µg/m³2026-09-08: 10.3 µg/m³2026-09-09: 5.7 µg/m³2026-09-10: 5.8 µg/m³2026-09-11: 7.4 µg/m³2026-09-12: 9.0 µg/m³2026-09-13: 11.3 µg/m³2026-09-15: 14.5 µg/m³2026-09-16: 843.0 µg/m³2026-09-17: 5.9 µg/m³2026-09-18: 8.4 µg/m³2026-09-19: 8.1 µg/m³2026-09-20: 7.9 µg/m³2026-09-21: 12.0 µg/m³2026-09-22: 9.8 µg/m³2026-09-23: 8.3 µg/m³2026-09-24: 15.3 µg/m³2026-09-25: 17.8 µg/m³2026-09-26: 9.2 µg/m³2026-09-27: 8.5 µg/m³2026-09-28: 12.2 µg/m³2026-09-29: 10.0 µg/m³2026-09-30: 10.9 µg/m³2026-10-01: 8.4 µg/m³Cheorwon1 day #12026-09-02: 427.0 µg/m³2026-09-03: 13.0 µg/m³2026-09-04: 10.4 µg/m³2026-09-05: 1,260.0 µg/m³, #12026-09-06: 5.6 µg/m³2026-09-07: 1,050.5 µg/m³, #32026-09-08: 12.5 µg/m³2026-09-09: 217.2 µg/m³2026-09-10: 8.4 µg/m³2026-09-11: 11.2 µg/m³2026-09-12: 16.8 µg/m³2026-09-13: 17.5 µg/m³2026-09-14: 19.3 µg/m³2026-09-15: 13.5 µg/m³2026-09-16: 12.4 µg/m³2026-09-17: 11.4 µg/m³2026-09-18: 218.6 µg/m³2026-09-19: 12.4 µg/m³2026-09-20: 13.7 µg/m³2026-09-21: 224.2 µg/m³2026-09-22: 20.0 µg/m³2026-09-23: 18.5 µg/m³2026-09-24: 19.9 µg/m³2026-09-25: 12.5 µg/m³2026-09-26: 7.7 µg/m³2026-09-27: 15.8 µg/m³2026-09-28: 16.9 µg/m³2026-09-29: 12.5 µg/m³2026-09-30: 15.5 µg/m³2026-10-01: 9.5 µg/m³T’aebaek1 day #12026-09-02: 419.0 µg/m³2026-09-03: 3.7 µg/m³2026-09-04: 3.3 µg/m³2026-09-05: 2.3 µg/m³2026-09-06: 4.1 µg/m³2026-09-07: 1,260.0 µg/m³, #12026-09-08: 4.4 µg/m³2026-09-09: 3.1 µg/m³2026-09-10: 2.7 µg/m³2026-09-11: 3.0 µg/m³2026-09-12: 3.5 µg/m³2026-09-13: 8.5 µg/m³2026-09-14: 11.1 µg/m³2026-09-15: 9.0 µg/m³2026-09-16: 7.3 µg/m³2026-09-17: 3.1 µg/m³2026-09-18: 3.5 µg/m³2026-09-19: 5.0 µg/m³2026-09-20: 6.3 µg/m³2026-09-21: 6.9 µg/m³2026-09-22: 5.4 µg/m³2026-09-23: 4.6 µg/m³2026-09-24: 10.0 µg/m³2026-09-25: 9.3 µg/m³2026-09-26: 4.4 µg/m³2026-09-27: 4.4 µg/m³2026-09-28: 8.6 µg/m³2026-09-29: 4.8 µg/m³2026-09-30: 7.6 µg/m³2026-10-01: 9.0 µg/m³Sep 2Oct 1
Every city that was the world's most polluted on at least one of the last 30 days. Filled square: #1 that day; ring: in the top 10; dot: measured but lower. Each city's own local day.

The world's air, last 30 days

2026-09-02: 126 of 2651 cities hazardous (5%)2026-09-02: 10 of 2651 cities unhealthy (0%)2026-09-02: 50 of 2651 cities unhealthy for sensitive groups (2%)2026-09-02: 819 of 2651 cities moderate (31%)2026-09-02: 1646 of 2651 cities good (62%)Sep 22026-09-03: 17 of 2651 cities hazardous (1%)2026-09-03: 7 of 2651 cities very unhealthy (0%)2026-09-03: 15 of 2651 cities unhealthy (1%)2026-09-03: 51 of 2651 cities unhealthy for sensitive groups (2%)2026-09-03: 732 of 2651 cities moderate (28%)2026-09-03: 1829 of 2651 cities good (69%)2026-09-04: 14 of 2653 cities hazardous (1%)2026-09-04: 3 of 2653 cities very unhealthy (0%)2026-09-04: 17 of 2653 cities unhealthy (1%)2026-09-04: 44 of 2653 cities unhealthy for sensitive groups (2%)2026-09-04: 630 of 2653 cities moderate (24%)2026-09-04: 1945 of 2653 cities good (73%)2026-09-05: 9 of 2663 cities hazardous (0%)2026-09-05: 5 of 2663 cities very unhealthy (0%)2026-09-05: 15 of 2663 cities unhealthy (1%)2026-09-05: 32 of 2663 cities unhealthy for sensitive groups (1%)2026-09-05: 616 of 2663 cities moderate (23%)2026-09-05: 1986 of 2663 cities good (75%)2026-09-06: 6 of 2455 cities hazardous (0%)2026-09-06: 5 of 2455 cities very unhealthy (0%)2026-09-06: 16 of 2455 cities unhealthy (1%)2026-09-06: 47 of 2455 cities unhealthy for sensitive groups (2%)2026-09-06: 557 of 2455 cities moderate (23%)2026-09-06: 1824 of 2455 cities good (74%)2026-09-07: 19 of 2637 cities hazardous (1%)2026-09-07: 5 of 2637 cities very unhealthy (0%)2026-09-07: 21 of 2637 cities unhealthy (1%)2026-09-07: 60 of 2637 cities unhealthy for sensitive groups (2%)2026-09-07: 599 of 2637 cities moderate (23%)2026-09-07: 1933 of 2637 cities good (73%)Sep 72026-09-08: 10 of 2604 cities hazardous (0%)2026-09-08: 4 of 2604 cities very unhealthy (0%)2026-09-08: 26 of 2604 cities unhealthy (1%)2026-09-08: 63 of 2604 cities unhealthy for sensitive groups (2%)2026-09-08: 677 of 2604 cities moderate (26%)2026-09-08: 1824 of 2604 cities good (70%)2026-09-09: 23 of 2631 cities hazardous (1%)2026-09-09: 9 of 2631 cities very unhealthy (0%)2026-09-09: 30 of 2631 cities unhealthy (1%)2026-09-09: 64 of 2631 cities unhealthy for sensitive groups (2%)2026-09-09: 603 of 2631 cities moderate (23%)2026-09-09: 1902 of 2631 cities good (72%)2026-09-10: 17 of 2585 cities hazardous (1%)2026-09-10: 5 of 2585 cities very unhealthy (0%)2026-09-10: 23 of 2585 cities unhealthy (1%)2026-09-10: 75 of 2585 cities unhealthy for sensitive groups (3%)2026-09-10: 476 of 2585 cities moderate (18%)2026-09-10: 1989 of 2585 cities good (77%)2026-09-11: 25 of 2411 cities hazardous (1%)2026-09-11: 6 of 2411 cities very unhealthy (0%)2026-09-11: 15 of 2411 cities unhealthy (1%)2026-09-11: 66 of 2411 cities unhealthy for sensitive groups (3%)2026-09-11: 555 of 2411 cities moderate (23%)2026-09-11: 1744 of 2411 cities good (72%)2026-09-12: 5 of 2461 cities hazardous (0%)2026-09-12: 1 of 2461 cities very unhealthy (0%)2026-09-12: 15 of 2461 cities unhealthy (1%)2026-09-12: 56 of 2461 cities unhealthy for sensitive groups (2%)2026-09-12: 728 of 2461 cities moderate (30%)2026-09-12: 1656 of 2461 cities good (67%)2026-09-13: 4 of 2301 cities hazardous (0%)2026-09-13: 1 of 2301 cities very unhealthy (0%)2026-09-13: 19 of 2301 cities unhealthy (1%)2026-09-13: 58 of 2301 cities unhealthy for sensitive groups (3%)2026-09-13: 707 of 2301 cities moderate (31%)2026-09-13: 1512 of 2301 cities good (66%)2026-09-14: 16 of 2459 cities hazardous (1%)2026-09-14: 1 of 2459 cities very unhealthy (0%)2026-09-14: 15 of 2459 cities unhealthy (1%)2026-09-14: 51 of 2459 cities unhealthy for sensitive groups (2%)2026-09-14: 696 of 2459 cities moderate (28%)2026-09-14: 1680 of 2459 cities good (68%)Sep 142026-09-15: 17 of 2547 cities hazardous (1%)2026-09-15: 5 of 2547 cities very unhealthy (0%)2026-09-15: 17 of 2547 cities unhealthy (1%)2026-09-15: 66 of 2547 cities unhealthy for sensitive groups (3%)2026-09-15: 718 of 2547 cities moderate (28%)2026-09-15: 1724 of 2547 cities good (68%)2026-09-16: 32 of 2618 cities hazardous (1%)2026-09-16: 4 of 2618 cities very unhealthy (0%)2026-09-16: 24 of 2618 cities unhealthy (1%)2026-09-16: 67 of 2618 cities unhealthy for sensitive groups (3%)2026-09-16: 757 of 2618 cities moderate (29%)2026-09-16: 1734 of 2618 cities good (66%)2026-09-17: 22 of 2610 cities hazardous (1%)2026-09-17: 1 of 2610 cities very unhealthy (0%)2026-09-17: 17 of 2610 cities unhealthy (1%)2026-09-17: 68 of 2610 cities unhealthy for sensitive groups (3%)2026-09-17: 670 of 2610 cities moderate (26%)2026-09-17: 1832 of 2610 cities good (70%)2026-09-18: 18 of 2681 cities hazardous (1%)2026-09-18: 5 of 2681 cities very unhealthy (0%)2026-09-18: 11 of 2681 cities unhealthy (0%)2026-09-18: 46 of 2681 cities unhealthy for sensitive groups (2%)2026-09-18: 688 of 2681 cities moderate (26%)2026-09-18: 1913 of 2681 cities good (71%)2026-09-19: 5 of 2685 cities hazardous (0%)2026-09-19: 4 of 2685 cities very unhealthy (0%)2026-09-19: 29 of 2685 cities unhealthy (1%)2026-09-19: 68 of 2685 cities unhealthy for sensitive groups (3%)2026-09-19: 687 of 2685 cities moderate (26%)2026-09-19: 1892 of 2685 cities good (70%)2026-09-20: 3 of 2432 cities hazardous (0%)2026-09-20: 4 of 2432 cities very unhealthy (0%)2026-09-20: 37 of 2432 cities unhealthy (2%)2026-09-20: 55 of 2432 cities unhealthy for sensitive groups (2%)2026-09-20: 566 of 2432 cities moderate (23%)2026-09-20: 1767 of 2432 cities good (73%)2026-09-21: 23 of 2553 cities hazardous (1%)2026-09-21: 5 of 2553 cities very unhealthy (0%)2026-09-21: 39 of 2553 cities unhealthy (2%)2026-09-21: 68 of 2553 cities unhealthy for sensitive groups (3%)2026-09-21: 581 of 2553 cities moderate (23%)2026-09-21: 1837 of 2553 cities good (72%)Sep 212026-09-22: 2 of 2619 cities hazardous (0%)2026-09-22: 2 of 2619 cities very unhealthy (0%)2026-09-22: 46 of 2619 cities unhealthy (2%)2026-09-22: 82 of 2619 cities unhealthy for sensitive groups (3%)2026-09-22: 680 of 2619 cities moderate (26%)2026-09-22: 1807 of 2619 cities good (69%)2026-09-23: 1 of 2685 cities very unhealthy (0%)2026-09-23: 51 of 2685 cities unhealthy (2%)2026-09-23: 63 of 2685 cities unhealthy for sensitive groups (2%)2026-09-23: 701 of 2685 cities moderate (26%)2026-09-23: 1869 of 2685 cities good (70%)2026-09-24: 1 of 2700 cities very unhealthy (0%)2026-09-24: 39 of 2700 cities unhealthy (1%)2026-09-24: 70 of 2700 cities unhealthy for sensitive groups (3%)2026-09-24: 863 of 2700 cities moderate (32%)2026-09-24: 1727 of 2700 cities good (64%)2026-09-25: 21 of 2658 cities unhealthy (1%)2026-09-25: 52 of 2658 cities unhealthy for sensitive groups (2%)2026-09-25: 946 of 2658 cities moderate (36%)2026-09-25: 1639 of 2658 cities good (62%)2026-09-26: 25 of 2665 cities unhealthy (1%)2026-09-26: 38 of 2665 cities unhealthy for sensitive groups (1%)2026-09-26: 909 of 2665 cities moderate (34%)2026-09-26: 1693 of 2665 cities good (64%)2026-09-27: 19 of 2564 cities unhealthy (1%)2026-09-27: 34 of 2564 cities unhealthy for sensitive groups (1%)2026-09-27: 840 of 2564 cities moderate (33%)2026-09-27: 1671 of 2564 cities good (65%)2026-09-28: 18 of 2634 cities unhealthy (1%)2026-09-28: 59 of 2634 cities unhealthy for sensitive groups (2%)2026-09-28: 899 of 2634 cities moderate (34%)2026-09-28: 1658 of 2634 cities good (63%)Sep 282026-09-29: 19 of 2679 cities unhealthy (1%)2026-09-29: 71 of 2679 cities unhealthy for sensitive groups (3%)2026-09-29: 1063 of 2679 cities moderate (40%)2026-09-29: 1526 of 2679 cities good (57%)2026-09-30: 12 of 2442 cities unhealthy (0%)2026-09-30: 21 of 2442 cities unhealthy for sensitive groups (1%)2026-09-30: 909 of 2442 cities moderate (37%)2026-09-30: 1500 of 2442 cities good (61%)2026-10-01: 7 of 1541 cities unhealthy (0%)2026-10-01: 19 of 1541 cities unhealthy for sensitive groups (1%)2026-10-01: 651 of 1541 cities moderate (42%)2026-10-01: 864 of 1541 cities good (56%)Oct 1
Each day's ranked cities split by band, worst at the top: a taller red and purple share means a worse day for more of the world, not just one city.

Climbing fastest

Movement shows once the board is a day old.

Cleanest air

Cities with reference monitors only.

What's missing

We rank only cities whose monitor data we're allowed to reuse. The government monitoring networks of China and Turkey publish no terms that allow this, so we leave them out: most cities there are missing here, not clean. The few of their cities that appear are measured by community low-cost sensors, tagged as such. Why.

Use this board

SmogRank, most polluted cities, PM2.5, last 30 days to 2 Oct 2026, 05:00 UTC, smogrank.com/?w=30d.

Download top 10 (PNG)

You're welcome to reuse a single chart, image or figure with this citation and a link. Terms.

Updated 2026-10-02 05:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors in µg/m³.