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.

#4 Seosan 224.6 µg/m³, more polluted than 99% 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 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 2,623 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: 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, as the US AQI PM2.5 sub-index.