The world's most polluted cities, ranked

2,346 of 2,447 measured cities in 72 countries breathed air above the WHO annual guideline of 5 µg/m³ so far this year. The worst was Miryang, South Korea, at 256.9.

#359 Loei 26.4 µg/m³, more polluted than 85% of 2,447
← Miryang 256.9 WHO annual 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 256.951.4×
  2. 2HwasunJeollanam-do, South Korea 216.043.2×
  3. 3SinhyeonGyeongsangnam-do, South Korea 144.829.0×
  4. 4SejongSejong-si, South Korea 139.227.8×
  5. 5HadongGyeongsangnam-do, South Korea 137.227.4×
  6. 6SeogwipoJeju-do, South Korea 136.027.2×
  7. 7SeosanChungcheongnam-do, South Korea 130.226.0×
  8. 8GaigeturiJeju-do, South Korea 124.424.9×
  9. 9HongseongChungcheongnam-do, South Korea 123.424.7×
  10. 10PubalGyeonggi-do, South Korea 107.121.4×
  11. 11KinzanChungcheongnam-do, South Korea 106.721.3×
  12. 12TangjinChungcheongnam-do, South Korea 105.021.0×
  13. 13GurugramHaryana, India 103.220.6×▼12
  14. 14BeolgyoJeollanam-do, South Korea no daily values yet100.020.0×
  15. 15AnseongGyeonggi-do, South Korea 98.719.7×
  16. 16Taesal-liChungcheongnam-do, South Korea 98.619.7×
  17. 17GapyeongGyeonggi-do, South Korea 93.418.7×
  18. 18YangjuGyeonggi-do, South Korea 92.018.4×
  19. 19Hwaseong-siGyeonggi-do, South Korea 91.418.3×
  20. 20Yangp'yŏngGyeonggi-do, South Korea 90.018.0×
  21. 21GangneungGangwon-do, South Korea 89.818.0×
  22. 22YeongdongNorth Chungcheong, South Korea 87.817.6×
  23. 23Faisalabadlow-cost sensorsPunjab, Pakistan 86.317.3×▼21
  24. 23GeojeGyeongsangnam-do, South Korea 86.317.3×
  25. 25HwawŏnDaegu, South Korea 85.017.0×
  26. 26TongyeongGyeongsangnam-do, South Korea 84.616.9×
  27. 27BoryeongChungcheongnam-do, South Korea 84.216.8×
  28. 28GongjuChungcheongnam-do, South Korea 84.116.8×
  29. 29NonsanChungcheongnam-do, South Korea 83.816.8×
  30. 30SinanJeollanam-do, South Korea 82.916.6×
  31. 31SeonghwanChungcheongnam-do, South Korea 82.816.6×
  32. 32BawānaDelhi, India 81.016.2×
  33. 33KosongGangwon-do, South Korea 80.416.1×
  34. 34Ganghwa-gunIncheon, South Korea 80.316.1×
  35. 35Charkhi DādriHaryana, India 79.816.0×
  36. 36NangenJeollabuk-do, South Korea 78.515.7×
  37. 36KunwiGyeongsangbuk-do, South Korea 78.515.7×
  38. 38ChuncheonGangwon-do, South Korea 78.215.6×
  39. 39WabuGyeonggi-do, South Korea 77.615.5×
  40. 40ChinjuGyeongsangnam-do, South Korea 77.515.5×
  41. 41Gujranwalalow-cost sensorsPunjab, Pakistan 77.115.4×▼38
  42. 42KimjeJeollabuk-do, South Korea 77.015.4×
  43. 43GoseongGyeongsangnam-do, South Korea 76.615.3×
  44. 44Lahorelow-cost sensorsPunjab, Pakistan 76.415.3×▼40
  45. 45Jeju CityJeju-do, South Korea 75.015.0×
  46. 46NamsaJeollabuk-do, South Korea 74.915.0×
  47. 47ChangsuJeollabuk-do, South Korea 74.514.9×
  48. 48OkcheonNorth Chungcheong, South Korea 74.314.9×
  49. 49T’aebaekGangwon-do, South Korea 73.514.7×
  50. 49MānesarHaryana, India 73.514.7×
All 2,447 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: 830 of 2651 cities moderate (31%)2026-09-02: 1635 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: 751 of 2651 cities moderate (28%)2026-09-03: 1810 of 2651 cities good (68%)2026-09-04: 14 of 2658 cities hazardous (1%)2026-09-04: 3 of 2658 cities very unhealthy (0%)2026-09-04: 17 of 2658 cities unhealthy (1%)2026-09-04: 44 of 2658 cities unhealthy for sensitive groups (2%)2026-09-04: 633 of 2658 cities moderate (24%)2026-09-04: 1947 of 2658 cities good (73%)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: 636 of 2665 cities moderate (24%)2026-09-05: 1968 of 2665 cities good (74%)2026-09-06: 6 of 2457 cities hazardous (0%)2026-09-06: 5 of 2457 cities very unhealthy (0%)2026-09-06: 16 of 2457 cities unhealthy (1%)2026-09-06: 47 of 2457 cities unhealthy for sensitive groups (2%)2026-09-06: 581 of 2457 cities moderate (24%)2026-09-06: 1802 of 2457 cities good (73%)2026-09-07: 19 of 2639 cities hazardous (1%)2026-09-07: 5 of 2639 cities very unhealthy (0%)2026-09-07: 21 of 2639 cities unhealthy (1%)2026-09-07: 60 of 2639 cities unhealthy for sensitive groups (2%)2026-09-07: 602 of 2639 cities moderate (23%)2026-09-07: 1932 of 2639 cities good (73%)Sep 72026-09-08: 10 of 2605 cities hazardous (0%)2026-09-08: 4 of 2605 cities very unhealthy (0%)2026-09-08: 26 of 2605 cities unhealthy (1%)2026-09-08: 63 of 2605 cities unhealthy for sensitive groups (2%)2026-09-08: 666 of 2605 cities moderate (26%)2026-09-08: 1836 of 2605 cities good (70%)2026-09-09: 23 of 2642 cities hazardous (1%)2026-09-09: 9 of 2642 cities very unhealthy (0%)2026-09-09: 30 of 2642 cities unhealthy (1%)2026-09-09: 64 of 2642 cities unhealthy for sensitive groups (2%)2026-09-09: 618 of 2642 cities moderate (23%)2026-09-09: 1898 of 2642 cities good (72%)2026-09-10: 17 of 2582 cities hazardous (1%)2026-09-10: 5 of 2582 cities very unhealthy (0%)2026-09-10: 23 of 2582 cities unhealthy (1%)2026-09-10: 75 of 2582 cities unhealthy for sensitive groups (3%)2026-09-10: 485 of 2582 cities moderate (19%)2026-09-10: 1977 of 2582 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: 555 of 2408 cities moderate (23%)2026-09-11: 1741 of 2408 cities good (72%)2026-09-12: 5 of 2456 cities hazardous (0%)2026-09-12: 1 of 2456 cities very unhealthy (0%)2026-09-12: 15 of 2456 cities unhealthy (1%)2026-09-12: 56 of 2456 cities unhealthy for sensitive groups (2%)2026-09-12: 713 of 2456 cities moderate (29%)2026-09-12: 1666 of 2456 cities good (68%)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: 58 of 2303 cities unhealthy for sensitive groups (3%)2026-09-13: 723 of 2303 cities moderate (31%)2026-09-13: 1498 of 2303 cities good (65%)2026-09-14: 16 of 2454 cities hazardous (1%)2026-09-14: 1 of 2454 cities very unhealthy (0%)2026-09-14: 15 of 2454 cities unhealthy (1%)2026-09-14: 51 of 2454 cities unhealthy for sensitive groups (2%)2026-09-14: 684 of 2454 cities moderate (28%)2026-09-14: 1687 of 2454 cities good (69%)Sep 142026-09-15: 17 of 2550 cities hazardous (1%)2026-09-15: 5 of 2550 cities very unhealthy (0%)2026-09-15: 17 of 2550 cities unhealthy (1%)2026-09-15: 66 of 2550 cities unhealthy for sensitive groups (3%)2026-09-15: 689 of 2550 cities moderate (27%)2026-09-15: 1756 of 2550 cities good (69%)2026-09-16: 32 of 2626 cities hazardous (1%)2026-09-16: 4 of 2626 cities very unhealthy (0%)2026-09-16: 24 of 2626 cities unhealthy (1%)2026-09-16: 67 of 2626 cities unhealthy for sensitive groups (3%)2026-09-16: 746 of 2626 cities moderate (28%)2026-09-16: 1753 of 2626 cities good (67%)2026-09-17: 22 of 2615 cities hazardous (1%)2026-09-17: 1 of 2615 cities very unhealthy (0%)2026-09-17: 17 of 2615 cities unhealthy (1%)2026-09-17: 68 of 2615 cities unhealthy for sensitive groups (3%)2026-09-17: 660 of 2615 cities moderate (25%)2026-09-17: 1847 of 2615 cities good (71%)2026-09-18: 18 of 2675 cities hazardous (1%)2026-09-18: 5 of 2675 cities very unhealthy (0%)2026-09-18: 11 of 2675 cities unhealthy (0%)2026-09-18: 46 of 2675 cities unhealthy for sensitive groups (2%)2026-09-18: 692 of 2675 cities moderate (26%)2026-09-18: 1903 of 2675 cities good (71%)2026-09-19: 5 of 2680 cities hazardous (0%)2026-09-19: 4 of 2680 cities very unhealthy (0%)2026-09-19: 29 of 2680 cities unhealthy (1%)2026-09-19: 68 of 2680 cities unhealthy for sensitive groups (3%)2026-09-19: 682 of 2680 cities moderate (25%)2026-09-19: 1892 of 2680 cities good (71%)2026-09-20: 3 of 2439 cities hazardous (0%)2026-09-20: 4 of 2439 cities very unhealthy (0%)2026-09-20: 37 of 2439 cities unhealthy (2%)2026-09-20: 55 of 2439 cities unhealthy for sensitive groups (2%)2026-09-20: 609 of 2439 cities moderate (25%)2026-09-20: 1731 of 2439 cities good (71%)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: 589 of 2553 cities moderate (23%)2026-09-21: 1829 of 2553 cities good (72%)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: 687 of 2629 cities moderate (26%)2026-09-22: 1810 of 2629 cities good (69%)2026-09-23: 1 of 2680 cities very unhealthy (0%)2026-09-23: 51 of 2680 cities unhealthy (2%)2026-09-23: 63 of 2680 cities unhealthy for sensitive groups (2%)2026-09-23: 677 of 2680 cities moderate (25%)2026-09-23: 1888 of 2680 cities good (70%)2026-09-24: 1 of 2693 cities very unhealthy (0%)2026-09-24: 39 of 2693 cities unhealthy (1%)2026-09-24: 70 of 2693 cities unhealthy for sensitive groups (3%)2026-09-24: 862 of 2693 cities moderate (32%)2026-09-24: 1721 of 2693 cities good (64%)2026-09-25: 21 of 2657 cities unhealthy (1%)2026-09-25: 52 of 2657 cities unhealthy for sensitive groups (2%)2026-09-25: 954 of 2657 cities moderate (36%)2026-09-25: 1630 of 2657 cities good (61%)2026-09-26: 25 of 2668 cities unhealthy (1%)2026-09-26: 38 of 2668 cities unhealthy for sensitive groups (1%)2026-09-26: 903 of 2668 cities moderate (34%)2026-09-26: 1702 of 2668 cities good (64%)2026-09-27: 19 of 2565 cities unhealthy (1%)2026-09-27: 34 of 2565 cities unhealthy for sensitive groups (1%)2026-09-27: 823 of 2565 cities moderate (32%)2026-09-27: 1689 of 2565 cities good (66%)2026-09-28: 18 of 2638 cities unhealthy (1%)2026-09-28: 59 of 2638 cities unhealthy for sensitive groups (2%)2026-09-28: 914 of 2638 cities moderate (35%)2026-09-28: 1647 of 2638 cities good (62%)Sep 282026-09-29: 19 of 2670 cities unhealthy (1%)2026-09-29: 71 of 2670 cities unhealthy for sensitive groups (3%)2026-09-29: 1031 of 2670 cities moderate (39%)2026-09-29: 1549 of 2670 cities good (58%)2026-09-30: 12 of 2477 cities unhealthy (0%)2026-09-30: 21 of 2477 cities unhealthy for sensitive groups (1%)2026-09-30: 914 of 2477 cities moderate (37%)2026-09-30: 1530 of 2477 cities good (62%)2026-10-01: 7 of 1586 cities unhealthy (0%)2026-10-01: 19 of 1586 cities unhealthy for sensitive groups (1%)2026-10-01: 676 of 1586 cities moderate (43%)2026-10-01: 884 of 1586 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, this year to 2 Oct 2026, 04:00 UTC, smogrank.com/?w=year.

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 04:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors in µg/m³.