The world's most polluted cities, ranked

478 of 2,623 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.

#633 Lamphun 10.8 µg/m³, more polluted than 75% of 2,623
← Miryang 307.9 µg/m³ 300 µg/m³15 WHO 24-hour guideline
Every ranked city, one column each, worst on the left and cleanest on the right; height is PM2.5 in µg/m³. 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 2,623 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: 48.5 µg/m³Gujranwala2 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 2649 cities hazardous (5%)2026-09-02: 10 of 2649 cities unhealthy (0%)2026-09-02: 49 of 2649 cities unhealthy for sensitive groups (2%)2026-09-02: 824 of 2649 cities moderate (31%)2026-09-02: 1640 of 2649 cities good (62%)Sep 22026-09-03: 17 of 2653 cities hazardous (1%)2026-09-03: 7 of 2653 cities very unhealthy (0%)2026-09-03: 15 of 2653 cities unhealthy (1%)2026-09-03: 51 of 2653 cities unhealthy for sensitive groups (2%)2026-09-03: 731 of 2653 cities moderate (28%)2026-09-03: 1832 of 2653 cities good (69%)2026-09-04: 14 of 2654 cities hazardous (1%)2026-09-04: 3 of 2654 cities very unhealthy (0%)2026-09-04: 17 of 2654 cities unhealthy (1%)2026-09-04: 44 of 2654 cities unhealthy for sensitive groups (2%)2026-09-04: 628 of 2654 cities moderate (24%)2026-09-04: 1948 of 2654 cities good (73%)2026-09-05: 9 of 2662 cities hazardous (0%)2026-09-05: 5 of 2662 cities very unhealthy (0%)2026-09-05: 15 of 2662 cities unhealthy (1%)2026-09-05: 32 of 2662 cities unhealthy for sensitive groups (1%)2026-09-05: 614 of 2662 cities moderate (23%)2026-09-05: 1987 of 2662 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: 591 of 2637 cities moderate (22%)2026-09-07: 1941 of 2637 cities good (74%)Sep 72026-09-08: 10 of 2600 cities hazardous (0%)2026-09-08: 4 of 2600 cities very unhealthy (0%)2026-09-08: 26 of 2600 cities unhealthy (1%)2026-09-08: 63 of 2600 cities unhealthy for sensitive groups (2%)2026-09-08: 684 of 2600 cities moderate (26%)2026-09-08: 1813 of 2600 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: 597 of 2631 cities moderate (23%)2026-09-09: 1908 of 2631 cities good (73%)2026-09-10: 17 of 2579 cities hazardous (1%)2026-09-10: 5 of 2579 cities very unhealthy (0%)2026-09-10: 23 of 2579 cities unhealthy (1%)2026-09-10: 75 of 2579 cities unhealthy for sensitive groups (3%)2026-09-10: 473 of 2579 cities moderate (18%)2026-09-10: 1986 of 2579 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: 557 of 2411 cities moderate (23%)2026-09-11: 1742 of 2411 cities good (72%)2026-09-12: 5 of 2468 cities hazardous (0%)2026-09-12: 1 of 2468 cities very unhealthy (0%)2026-09-12: 15 of 2468 cities unhealthy (1%)2026-09-12: 57 of 2468 cities unhealthy for sensitive groups (2%)2026-09-12: 732 of 2468 cities moderate (30%)2026-09-12: 1658 of 2468 cities good (67%)2026-09-13: 4 of 2303 cities hazardous (0%)2026-09-13: 1 of 2303 cities very unhealthy (0%)2026-09-13: 19 of 2303 cities unhealthy (1%)2026-09-13: 57 of 2303 cities unhealthy for sensitive groups (2%)2026-09-13: 705 of 2303 cities moderate (31%)2026-09-13: 1517 of 2303 cities good (66%)2026-09-14: 16 of 2455 cities hazardous (1%)2026-09-14: 1 of 2455 cities very unhealthy (0%)2026-09-14: 15 of 2455 cities unhealthy (1%)2026-09-14: 51 of 2455 cities unhealthy for sensitive groups (2%)2026-09-14: 692 of 2455 cities moderate (28%)2026-09-14: 1680 of 2455 cities good (68%)Sep 142026-09-15: 17 of 2545 cities hazardous (1%)2026-09-15: 5 of 2545 cities very unhealthy (0%)2026-09-15: 17 of 2545 cities unhealthy (1%)2026-09-15: 66 of 2545 cities unhealthy for sensitive groups (3%)2026-09-15: 725 of 2545 cities moderate (28%)2026-09-15: 1715 of 2545 cities good (67%)2026-09-16: 32 of 2624 cities hazardous (1%)2026-09-16: 4 of 2624 cities very unhealthy (0%)2026-09-16: 24 of 2624 cities unhealthy (1%)2026-09-16: 68 of 2624 cities unhealthy for sensitive groups (3%)2026-09-16: 757 of 2624 cities moderate (29%)2026-09-16: 1739 of 2624 cities good (66%)2026-09-17: 22 of 2607 cities hazardous (1%)2026-09-17: 1 of 2607 cities very unhealthy (0%)2026-09-17: 17 of 2607 cities unhealthy (1%)2026-09-17: 67 of 2607 cities unhealthy for sensitive groups (3%)2026-09-17: 670 of 2607 cities moderate (26%)2026-09-17: 1830 of 2607 cities good (70%)2026-09-18: 18 of 2683 cities hazardous (1%)2026-09-18: 5 of 2683 cities very unhealthy (0%)2026-09-18: 12 of 2683 cities unhealthy (0%)2026-09-18: 46 of 2683 cities unhealthy for sensitive groups (2%)2026-09-18: 670 of 2683 cities moderate (25%)2026-09-18: 1932 of 2683 cities good (72%)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: 691 of 2685 cities moderate (26%)2026-09-19: 1888 of 2685 cities good (70%)2026-09-20: 3 of 2425 cities hazardous (0%)2026-09-20: 4 of 2425 cities very unhealthy (0%)2026-09-20: 36 of 2425 cities unhealthy (1%)2026-09-20: 55 of 2425 cities unhealthy for sensitive groups (2%)2026-09-20: 567 of 2425 cities moderate (23%)2026-09-20: 1760 of 2425 cities good (73%)2026-09-21: 23 of 2554 cities hazardous (1%)2026-09-21: 5 of 2554 cities very unhealthy (0%)2026-09-21: 39 of 2554 cities unhealthy (2%)2026-09-21: 69 of 2554 cities unhealthy for sensitive groups (3%)2026-09-21: 588 of 2554 cities moderate (23%)2026-09-21: 1830 of 2554 cities good (72%)Sep 212026-09-22: 2 of 2628 cities hazardous (0%)2026-09-22: 2 of 2628 cities very unhealthy (0%)2026-09-22: 46 of 2628 cities unhealthy (2%)2026-09-22: 82 of 2628 cities unhealthy for sensitive groups (3%)2026-09-22: 686 of 2628 cities moderate (26%)2026-09-22: 1810 of 2628 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: 62 of 2685 cities unhealthy for sensitive groups (2%)2026-09-23: 696 of 2685 cities moderate (26%)2026-09-23: 1875 of 2685 cities good (70%)2026-09-24: 1 of 2701 cities very unhealthy (0%)2026-09-24: 39 of 2701 cities unhealthy (1%)2026-09-24: 70 of 2701 cities unhealthy for sensitive groups (3%)2026-09-24: 859 of 2701 cities moderate (32%)2026-09-24: 1732 of 2701 cities good (64%)2026-09-25: 21 of 2659 cities unhealthy (1%)2026-09-25: 52 of 2659 cities unhealthy for sensitive groups (2%)2026-09-25: 945 of 2659 cities moderate (36%)2026-09-25: 1641 of 2659 cities good (62%)2026-09-26: 25 of 2666 cities unhealthy (1%)2026-09-26: 38 of 2666 cities unhealthy for sensitive groups (1%)2026-09-26: 905 of 2666 cities moderate (34%)2026-09-26: 1698 of 2666 cities good (64%)2026-09-27: 19 of 2560 cities unhealthy (1%)2026-09-27: 34 of 2560 cities unhealthy for sensitive groups (1%)2026-09-27: 837 of 2560 cities moderate (33%)2026-09-27: 1670 of 2560 cities good (65%)2026-09-28: 18 of 2638 cities unhealthy (1%)2026-09-28: 59 of 2638 cities unhealthy for sensitive groups (2%)2026-09-28: 906 of 2638 cities moderate (34%)2026-09-28: 1655 of 2638 cities good (63%)Sep 282026-09-29: 19 of 2681 cities unhealthy (1%)2026-09-29: 71 of 2681 cities unhealthy for sensitive groups (3%)2026-09-29: 1064 of 2681 cities moderate (40%)2026-09-29: 1527 of 2681 cities good (57%)2026-09-30: 12 of 2438 cities unhealthy (0%)2026-09-30: 21 of 2438 cities unhealthy for sensitive groups (1%)2026-09-30: 906 of 2438 cities moderate (37%)2026-09-30: 1499 of 2438 cities good (61%)2026-10-01: 7 of 1506 cities unhealthy (0%)2026-10-01: 19 of 1506 cities unhealthy for sensitive groups (1%)2026-10-01: 650 of 1506 cities moderate (43%)2026-10-01: 830 of 1506 cities good (55%)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, 06:00 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 06:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors in µg/m³.