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.

#3 Nangen 248.9 µg/m³, more polluted than 99% 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 465
  2. 2HwasunJeollanam-do, South Korea 425
  3. 3NangenJeollabuk-do, South Korea 348
  4. 4SeosanChungcheongnam-do, South Korea 299
  5. 5GaigeturiJeju-do, South Korea 270
  6. 6Hwaseong-siGyeonggi-do, South Korea 258
  7. 7Taesal-liChungcheongnam-do, South Korea 252
  8. 8KosongGangwon-do, South Korea 246
  9. 9SeogwipoJeju-do, South Korea 244
  10. 10AnseongGyeonggi-do, South Korea 240
  11. 11SinhyeonGyeongsangnam-do, South Korea 219
  12. 12NonsanChungcheongnam-do, South Korea 211
  13. 13ChangsuJeollabuk-do, South Korea 204
  14. 14MokpoJeollanam-do, South Korea 202
  15. 15KimjeJeollabuk-do, South Korea 202
  16. 16JeongeupJeollabuk-do, South Korea 201
  17. 17HadongGyeongsangnam-do, South Korea 200
  18. 18Yangp'yŏngGyeonggi-do, South Korea 200
  19. 19CheorwonGangwon-do, South Korea 199
  20. 20KunwiGyeongsangbuk-do, South Korea 198
  21. 21GeojeGyeongsangnam-do, South Korea 192
  22. 22ChinjuGyeongsangnam-do, South Korea 191
  23. 23YesanChungcheongnam-do, South Korea 190
  24. 24PubalGyeonggi-do, South Korea 190
  25. 25BuanJeollabuk-do, South Korea 190
  26. 26YeojuGyeonggi-do, South Korea 189
  27. 27YŏnmuChungcheongnam-do, South Korea 188
  28. 28NamsaJeollabuk-do, South Korea 188
  29. 29YangsanGyeongsangnam-do, South Korea 187
  30. 30BuyeoChungcheongnam-do, South Korea 187
  31. 30HwawŏnDaegu, South Korea 187
  32. 32GunsanJeollabuk-do, South Korea 185
  33. 33TangjinChungcheongnam-do, South Korea 183
  34. 34GangneungGangwon-do, South Korea 181
  35. 35Cheongju-siNorth Chungcheong, South Korea 180
  36. 36YeonggwangJeollanam-do, South Korea 180
  37. 37YecheonGyeongsangbuk-do, South Korea 179
  38. 38JungpyongNorth Chungcheong, South Korea 179
  39. 39Ganghwa-gunIncheon, South Korea 179
  40. 40KoesanNorth Chungcheong, South Korea 179
  41. 41GoseongGyeongsangnam-do, South Korea 179
  42. 42YeongdongNorth Chungcheong, South Korea 179
  43. 42YangjuGyeonggi-do, South Korea 179
  44. 42BoryeongChungcheongnam-do, South Korea 179
  45. 45JangheungJeollanam-do, South Korea 177
  46. 46Jeju CityJeju-do, South Korea 177
  47. 47Koch'angJeollabuk-do, South Korea 176
  48. 48Icheon-siGyeonggi-do, South Korea 176
  49. 49MuanJeollanam-do, South Korea 175
  50. 50HongseongChungcheongnam-do, South Korea 175
All 2,624 cities
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). 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, as the US AQI PM2.5 sub-index.