The world's most polluted cities, ranked

478 of 2,622 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.

#118 Cheongsong gun 50.4 µg/m³, more polluted than 95% of 2,622
← 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 2,622 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 2638 cities hazardous (5%)2026-09-02: 10 of 2638 cities unhealthy (0%)2026-09-02: 49 of 2638 cities unhealthy for sensitive groups (2%)2026-09-02: 802 of 2638 cities moderate (30%)2026-09-02: 1651 of 2638 cities good (63%)Sep 22026-09-03: 17 of 2661 cities hazardous (1%)2026-09-03: 7 of 2661 cities very unhealthy (0%)2026-09-03: 15 of 2661 cities unhealthy (1%)2026-09-03: 51 of 2661 cities unhealthy for sensitive groups (2%)2026-09-03: 718 of 2661 cities moderate (27%)2026-09-03: 1853 of 2661 cities good (70%)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: 619 of 2654 cities moderate (23%)2026-09-04: 1957 of 2654 cities good (74%)2026-09-05: 9 of 2665 cities hazardous (0%)2026-09-05: 5 of 2665 cities very unhealthy (0%)2026-09-05: 15 of 2665 cities unhealthy (1%)2026-09-05: 32 of 2665 cities unhealthy for sensitive groups (1%)2026-09-05: 619 of 2665 cities moderate (23%)2026-09-05: 1985 of 2665 cities good (74%)2026-09-06: 6 of 2454 cities hazardous (0%)2026-09-06: 5 of 2454 cities very unhealthy (0%)2026-09-06: 16 of 2454 cities unhealthy (1%)2026-09-06: 47 of 2454 cities unhealthy for sensitive groups (2%)2026-09-06: 561 of 2454 cities moderate (23%)2026-09-06: 1819 of 2454 cities good (74%)2026-09-07: 19 of 2634 cities hazardous (1%)2026-09-07: 5 of 2634 cities very unhealthy (0%)2026-09-07: 21 of 2634 cities unhealthy (1%)2026-09-07: 60 of 2634 cities unhealthy for sensitive groups (2%)2026-09-07: 588 of 2634 cities moderate (22%)2026-09-07: 1941 of 2634 cities good (74%)Sep 72026-09-08: 10 of 2595 cities hazardous (0%)2026-09-08: 4 of 2595 cities very unhealthy (0%)2026-09-08: 26 of 2595 cities unhealthy (1%)2026-09-08: 63 of 2595 cities unhealthy for sensitive groups (2%)2026-09-08: 690 of 2595 cities moderate (27%)2026-09-08: 1802 of 2595 cities good (69%)2026-09-09: 23 of 2629 cities hazardous (1%)2026-09-09: 9 of 2629 cities very unhealthy (0%)2026-09-09: 30 of 2629 cities unhealthy (1%)2026-09-09: 64 of 2629 cities unhealthy for sensitive groups (2%)2026-09-09: 604 of 2629 cities moderate (23%)2026-09-09: 1899 of 2629 cities good (72%)2026-09-10: 17 of 2575 cities hazardous (1%)2026-09-10: 5 of 2575 cities very unhealthy (0%)2026-09-10: 23 of 2575 cities unhealthy (1%)2026-09-10: 75 of 2575 cities unhealthy for sensitive groups (3%)2026-09-10: 475 of 2575 cities moderate (18%)2026-09-10: 1980 of 2575 cities good (77%)2026-09-11: 25 of 2408 cities hazardous (1%)2026-09-11: 6 of 2408 cities very unhealthy (0%)2026-09-11: 15 of 2408 cities unhealthy (1%)2026-09-11: 66 of 2408 cities unhealthy for sensitive groups (3%)2026-09-11: 566 of 2408 cities moderate (24%)2026-09-11: 1730 of 2408 cities good (72%)2026-09-12: 5 of 2483 cities hazardous (0%)2026-09-12: 1 of 2483 cities very unhealthy (0%)2026-09-12: 15 of 2483 cities unhealthy (1%)2026-09-12: 57 of 2483 cities unhealthy for sensitive groups (2%)2026-09-12: 756 of 2483 cities moderate (30%)2026-09-12: 1649 of 2483 cities good (66%)2026-09-13: 4 of 2299 cities hazardous (0%)2026-09-13: 1 of 2299 cities very unhealthy (0%)2026-09-13: 19 of 2299 cities unhealthy (1%)2026-09-13: 57 of 2299 cities unhealthy for sensitive groups (2%)2026-09-13: 687 of 2299 cities moderate (30%)2026-09-13: 1531 of 2299 cities good (67%)2026-09-14: 16 of 2453 cities hazardous (1%)2026-09-14: 1 of 2453 cities very unhealthy (0%)2026-09-14: 15 of 2453 cities unhealthy (1%)2026-09-14: 51 of 2453 cities unhealthy for sensitive groups (2%)2026-09-14: 690 of 2453 cities moderate (28%)2026-09-14: 1680 of 2453 cities good (68%)Sep 142026-09-15: 17 of 2548 cities hazardous (1%)2026-09-15: 5 of 2548 cities very unhealthy (0%)2026-09-15: 17 of 2548 cities unhealthy (1%)2026-09-15: 66 of 2548 cities unhealthy for sensitive groups (3%)2026-09-15: 741 of 2548 cities moderate (29%)2026-09-15: 1702 of 2548 cities good (67%)2026-09-16: 32 of 2623 cities hazardous (1%)2026-09-16: 4 of 2623 cities very unhealthy (0%)2026-09-16: 24 of 2623 cities unhealthy (1%)2026-09-16: 68 of 2623 cities unhealthy for sensitive groups (3%)2026-09-16: 741 of 2623 cities moderate (28%)2026-09-16: 1754 of 2623 cities good (67%)2026-09-17: 22 of 2605 cities hazardous (1%)2026-09-17: 1 of 2605 cities very unhealthy (0%)2026-09-17: 17 of 2605 cities unhealthy (1%)2026-09-17: 67 of 2605 cities unhealthy for sensitive groups (3%)2026-09-17: 654 of 2605 cities moderate (25%)2026-09-17: 1844 of 2605 cities good (71%)2026-09-18: 18 of 2687 cities hazardous (1%)2026-09-18: 5 of 2687 cities very unhealthy (0%)2026-09-18: 12 of 2687 cities unhealthy (0%)2026-09-18: 46 of 2687 cities unhealthy for sensitive groups (2%)2026-09-18: 686 of 2687 cities moderate (26%)2026-09-18: 1920 of 2687 cities good (71%)2026-09-19: 5 of 2687 cities hazardous (0%)2026-09-19: 4 of 2687 cities very unhealthy (0%)2026-09-19: 29 of 2687 cities unhealthy (1%)2026-09-19: 68 of 2687 cities unhealthy for sensitive groups (3%)2026-09-19: 718 of 2687 cities moderate (27%)2026-09-19: 1863 of 2687 cities good (69%)2026-09-20: 3 of 2423 cities hazardous (0%)2026-09-20: 4 of 2423 cities very unhealthy (0%)2026-09-20: 36 of 2423 cities unhealthy (1%)2026-09-20: 55 of 2423 cities unhealthy for sensitive groups (2%)2026-09-20: 567 of 2423 cities moderate (23%)2026-09-20: 1758 of 2423 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: 69 of 2553 cities unhealthy for sensitive groups (3%)2026-09-21: 554 of 2553 cities moderate (22%)2026-09-21: 1863 of 2553 cities good (73%)Sep 212026-09-22: 2 of 2629 cities hazardous (0%)2026-09-22: 2 of 2629 cities very unhealthy (0%)2026-09-22: 46 of 2629 cities unhealthy (2%)2026-09-22: 82 of 2629 cities unhealthy for sensitive groups (3%)2026-09-22: 677 of 2629 cities moderate (26%)2026-09-22: 1820 of 2629 cities good (69%)2026-09-23: 1 of 2686 cities very unhealthy (0%)2026-09-23: 51 of 2686 cities unhealthy (2%)2026-09-23: 62 of 2686 cities unhealthy for sensitive groups (2%)2026-09-23: 726 of 2686 cities moderate (27%)2026-09-23: 1846 of 2686 cities good (69%)2026-09-24: 1 of 2702 cities very unhealthy (0%)2026-09-24: 39 of 2702 cities unhealthy (1%)2026-09-24: 71 of 2702 cities unhealthy for sensitive groups (3%)2026-09-24: 871 of 2702 cities moderate (32%)2026-09-24: 1720 of 2702 cities good (64%)2026-09-25: 21 of 2660 cities unhealthy (1%)2026-09-25: 51 of 2660 cities unhealthy for sensitive groups (2%)2026-09-25: 922 of 2660 cities moderate (35%)2026-09-25: 1666 of 2660 cities good (63%)2026-09-26: 25 of 2667 cities unhealthy (1%)2026-09-26: 38 of 2667 cities unhealthy for sensitive groups (1%)2026-09-26: 900 of 2667 cities moderate (34%)2026-09-26: 1704 of 2667 cities good (64%)2026-09-27: 19 of 2558 cities unhealthy (1%)2026-09-27: 34 of 2558 cities unhealthy for sensitive groups (1%)2026-09-27: 828 of 2558 cities moderate (32%)2026-09-27: 1677 of 2558 cities good (66%)2026-09-28: 18 of 2637 cities unhealthy (1%)2026-09-28: 59 of 2637 cities unhealthy for sensitive groups (2%)2026-09-28: 910 of 2637 cities moderate (35%)2026-09-28: 1650 of 2637 cities good (63%)Sep 282026-09-29: 19 of 2672 cities unhealthy (1%)2026-09-29: 71 of 2672 cities unhealthy for sensitive groups (3%)2026-09-29: 1074 of 2672 cities moderate (40%)2026-09-29: 1508 of 2672 cities good (56%)2026-09-30: 12 of 2422 cities unhealthy (0%)2026-09-30: 21 of 2422 cities unhealthy for sensitive groups (1%)2026-09-30: 917 of 2422 cities moderate (38%)2026-09-30: 1472 of 2422 cities good (61%)2026-10-01: 7 of 1464 cities unhealthy (0%)2026-10-01: 19 of 1464 cities unhealthy for sensitive groups (1%)2026-10-01: 635 of 1464 cities moderate (43%)2026-10-01: 803 of 1464 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, 07:00 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 07:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.