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 µg/m³ 200 µg/m³5 WHO annual 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 10+51.4×
  2. 2HwasunJeollanam-do, South Korea 10+43.2×
  3. 3SinhyeonGyeongsangnam-do, South Korea 10+29.0×
  4. 4SejongSejong-si, South Korea 10+27.8×
  5. 5HadongGyeongsangnam-do, South Korea 10+27.4×
  6. 6SeogwipoJeju-do, South Korea 10+27.2×
  7. 7SeosanChungcheongnam-do, South Korea 10+26.0×
  8. 8GaigeturiJeju-do, South Korea 10+24.9×
  9. 9HongseongChungcheongnam-do, South Korea 10+24.7×
  10. 10PubalGyeonggi-do, South Korea 10+21.4×
  11. 11KinzanChungcheongnam-do, South Korea 10+21.3×
  12. 12TangjinChungcheongnam-do, South Korea 10+21.0×
  13. 13GurugramHaryana, India 10+20.6×▼12
  14. 14BeolgyoJeollanam-do, South Korea no daily values yet1020.0×
  15. 15AnseongGyeonggi-do, South Korea 1019.7×
  16. 16Taesal-liChungcheongnam-do, South Korea 1019.7×
  17. 17GapyeongGyeonggi-do, South Korea 1018.7×
  18. 18YangjuGyeonggi-do, South Korea 1018.4×
  19. 19Hwaseong-siGyeonggi-do, South Korea 1018.3×
  20. 20Yangp'yŏngGyeonggi-do, South Korea 918.0×
  21. 21GangneungGangwon-do, South Korea 918.0×
  22. 22YeongdongNorth Chungcheong, South Korea 917.6×
  23. 23Faisalabadlow-cost sensorsPunjab, Pakistan 917.3×▼21
  24. 23GeojeGyeongsangnam-do, South Korea 917.3×
  25. 25HwawŏnDaegu, South Korea 917.0×
  26. 26TongyeongGyeongsangnam-do, South Korea 916.9×
  27. 27BoryeongChungcheongnam-do, South Korea 916.8×
  28. 28GongjuChungcheongnam-do, South Korea 916.8×
  29. 29NonsanChungcheongnam-do, South Korea 916.8×
  30. 30SinanJeollanam-do, South Korea 916.6×
  31. 31SeonghwanChungcheongnam-do, South Korea 916.6×
  32. 32BawānaDelhi, India 916.2×
  33. 33KosongGangwon-do, South Korea 916.1×
  34. 34Ganghwa-gunIncheon, South Korea 916.1×
  35. 35Charkhi DādriHaryana, India 816.0×
  36. 36NangenJeollabuk-do, South Korea 815.7×
  37. 36KunwiGyeongsangbuk-do, South Korea 815.7×
  38. 38ChuncheonGangwon-do, South Korea 815.6×
  39. 39WabuGyeonggi-do, South Korea 815.5×
  40. 40ChinjuGyeongsangnam-do, South Korea 815.5×
  41. 41Gujranwalalow-cost sensorsPunjab, Pakistan 815.4×▼38
  42. 42KimjeJeollabuk-do, South Korea 815.4×
  43. 43GoseongGyeongsangnam-do, South Korea 815.3×
  44. 44Lahorelow-cost sensorsPunjab, Pakistan 815.3×▼40
  45. 45Jeju CityJeju-do, South Korea 815.0×
  46. 46NamsaJeollabuk-do, South Korea 815.0×
  47. 47ChangsuJeollabuk-do, South Korea 814.9×
  48. 48OkcheonNorth Chungcheong, South Korea 814.9×
  49. 49T’aebaekGangwon-do, South Korea 814.7×
  50. 49MānesarHaryana, India 814.7×
All 2,447 cities
Low risk1–3
Moderate risk4–6
High risk7–10
Very high risk10+

Canada's AQHI+ for PM2.5 (1 point per 10 µg/m³), which is defined on hourly values. 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: 128 of 2649 cities very high risk (5%)2026-09-02: 5 of 2649 cities high risk (0%)2026-09-02: 87 of 2649 cities moderate risk (3%)2026-09-02: 2429 of 2649 cities low risk (92%)Sep 22026-09-03: 24 of 2653 cities very high risk (1%)2026-09-03: 8 of 2653 cities high risk (0%)2026-09-03: 97 of 2653 cities moderate risk (4%)2026-09-03: 2524 of 2653 cities low risk (95%)2026-09-04: 17 of 2654 cities very high risk (1%)2026-09-04: 13 of 2654 cities high risk (0%)2026-09-04: 85 of 2654 cities moderate risk (3%)2026-09-04: 2539 of 2654 cities low risk (96%)2026-09-05: 14 of 2662 cities very high risk (1%)2026-09-05: 11 of 2662 cities high risk (0%)2026-09-05: 77 of 2662 cities moderate risk (3%)2026-09-05: 2560 of 2662 cities low risk (96%)2026-09-06: 14 of 2455 cities very high risk (1%)2026-09-06: 11 of 2455 cities high risk (0%)2026-09-06: 86 of 2455 cities moderate risk (4%)2026-09-06: 2344 of 2455 cities low risk (95%)2026-09-07: 25 of 2637 cities very high risk (1%)2026-09-07: 14 of 2637 cities high risk (1%)2026-09-07: 97 of 2637 cities moderate risk (4%)2026-09-07: 2501 of 2637 cities low risk (95%)Sep 72026-09-08: 15 of 2600 cities very high risk (1%)2026-09-08: 14 of 2600 cities high risk (1%)2026-09-08: 101 of 2600 cities moderate risk (4%)2026-09-08: 2470 of 2600 cities low risk (95%)2026-09-09: 34 of 2631 cities very high risk (1%)2026-09-09: 17 of 2631 cities high risk (1%)2026-09-09: 105 of 2631 cities moderate risk (4%)2026-09-09: 2475 of 2631 cities low risk (94%)2026-09-10: 23 of 2579 cities very high risk (1%)2026-09-10: 19 of 2579 cities high risk (1%)2026-09-10: 114 of 2579 cities moderate risk (4%)2026-09-10: 2423 of 2579 cities low risk (94%)2026-09-11: 32 of 2411 cities very high risk (1%)2026-09-11: 9 of 2411 cities high risk (0%)2026-09-11: 102 of 2411 cities moderate risk (4%)2026-09-11: 2268 of 2411 cities low risk (94%)2026-09-12: 7 of 2468 cities very high risk (0%)2026-09-12: 9 of 2468 cities high risk (0%)2026-09-12: 95 of 2468 cities moderate risk (4%)2026-09-12: 2357 of 2468 cities low risk (96%)2026-09-13: 6 of 2303 cities very high risk (0%)2026-09-13: 10 of 2303 cities high risk (0%)2026-09-13: 87 of 2303 cities moderate risk (4%)2026-09-13: 2200 of 2303 cities low risk (96%)2026-09-14: 18 of 2455 cities very high risk (1%)2026-09-14: 10 of 2455 cities high risk (0%)2026-09-14: 88 of 2455 cities moderate risk (4%)2026-09-14: 2339 of 2455 cities low risk (95%)Sep 142026-09-15: 25 of 2545 cities very high risk (1%)2026-09-15: 8 of 2545 cities high risk (0%)2026-09-15: 108 of 2545 cities moderate risk (4%)2026-09-15: 2404 of 2545 cities low risk (94%)2026-09-16: 36 of 2624 cities very high risk (1%)2026-09-16: 16 of 2624 cities high risk (1%)2026-09-16: 122 of 2624 cities moderate risk (5%)2026-09-16: 2450 of 2624 cities low risk (93%)2026-09-17: 23 of 2607 cities very high risk (1%)2026-09-17: 10 of 2607 cities high risk (0%)2026-09-17: 115 of 2607 cities moderate risk (4%)2026-09-17: 2459 of 2607 cities low risk (94%)2026-09-18: 23 of 2683 cities very high risk (1%)2026-09-18: 8 of 2683 cities high risk (0%)2026-09-18: 94 of 2683 cities moderate risk (4%)2026-09-18: 2558 of 2683 cities low risk (95%)2026-09-19: 10 of 2685 cities very high risk (0%)2026-09-19: 24 of 2685 cities high risk (1%)2026-09-19: 104 of 2685 cities moderate risk (4%)2026-09-19: 2547 of 2685 cities low risk (95%)2026-09-20: 11 of 2425 cities very high risk (0%)2026-09-20: 26 of 2425 cities high risk (1%)2026-09-20: 95 of 2425 cities moderate risk (4%)2026-09-20: 2293 of 2425 cities low risk (95%)2026-09-21: 31 of 2554 cities very high risk (1%)2026-09-21: 28 of 2554 cities high risk (1%)2026-09-21: 114 of 2554 cities moderate risk (4%)2026-09-21: 2381 of 2554 cities low risk (93%)Sep 212026-09-22: 7 of 2628 cities very high risk (0%)2026-09-22: 33 of 2628 cities high risk (1%)2026-09-22: 117 of 2628 cities moderate risk (4%)2026-09-22: 2471 of 2628 cities low risk (94%)2026-09-23: 6 of 2685 cities very high risk (0%)2026-09-23: 38 of 2685 cities high risk (1%)2026-09-23: 100 of 2685 cities moderate risk (4%)2026-09-23: 2541 of 2685 cities low risk (95%)2026-09-24: 2 of 2701 cities very high risk (0%)2026-09-24: 33 of 2701 cities high risk (1%)2026-09-24: 104 of 2701 cities moderate risk (4%)2026-09-24: 2562 of 2701 cities low risk (95%)2026-09-25: 1 of 2659 cities very high risk (0%)2026-09-25: 19 of 2659 cities high risk (1%)2026-09-25: 85 of 2659 cities moderate risk (3%)2026-09-25: 2554 of 2659 cities low risk (96%)2026-09-26: 20 of 2666 cities high risk (1%)2026-09-26: 73 of 2666 cities moderate risk (3%)2026-09-26: 2573 of 2666 cities low risk (97%)2026-09-27: 2 of 2560 cities very high risk (0%)2026-09-27: 12 of 2560 cities high risk (0%)2026-09-27: 70 of 2560 cities moderate risk (3%)2026-09-27: 2476 of 2560 cities low risk (97%)2026-09-28: 1 of 2638 cities very high risk (0%)2026-09-28: 10 of 2638 cities high risk (0%)2026-09-28: 107 of 2638 cities moderate risk (4%)2026-09-28: 2520 of 2638 cities low risk (96%)Sep 282026-09-29: 1 of 2681 cities very high risk (0%)2026-09-29: 10 of 2681 cities high risk (0%)2026-09-29: 132 of 2681 cities moderate risk (5%)2026-09-29: 2538 of 2681 cities low risk (95%)2026-09-30: 11 of 2438 cities high risk (0%)2026-09-30: 33 of 2438 cities moderate risk (1%)2026-09-30: 2394 of 2438 cities low risk (98%)2026-10-01: 1 of 1506 cities very high risk (0%)2026-10-01: 3 of 1506 cities high risk (0%)2026-10-01: 32 of 1506 cities moderate risk (2%)2026-10-01: 1470 of 1506 cities low risk (98%)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, 06:00 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 06:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the Canada AQHI+ PM2.5 sub-index.