SmogRank / Germany / North Rhine-Westphalia

Air quality in Krefeld

North Rhine-Westphalia, Germany. PM2.5 from 2 reference monitors, updated hourly.

7.7µg/m³
Good

Latest hour (16:00 UTC), 0.5× the WHO 24-hour guideline.

Rank, worst first

24 hours–not enough data
7 days–not enough data
30 days–not enough data
This year#609of 2,173, at 10.2 µg/m³

Why it ranks here

Likely fire smoke. On Sep 29, when Krefeld averaged 16.5 µg/m³ (its typical day: 8.1), NASA satellites detected 58 fires within 300 km (12 within 100 km). Smoke from those fires is a likely contributor; we don't check which way the wind blew, and mapped smoke can be high above the ground.
Seasonal. Over the past year its worst months were January, March, December, averaging up to 16.7 µg/m³ against 6.5 in its cleanest month. Seasonal peaks usually come from heating, crop burning, fire or dust seasons.

Based on Krefeld's own measurements, with fire detections from NASA FIRMS and smoke maps from NOAA HMS; causes are the usual kinds for a pattern like this, not a confirmed source.

The last 12 months, day by day

1102031Oct 2025NovDecJan 2026FebMarAprMayJunJulAugSep2025-10-01: no data2025-10-02: no data2025-10-03: 7.6 µg/m³2025-10-04: 4.8 µg/m³2025-10-05: 7.4 µg/m³2025-10-06: no data2025-10-07: no data2025-10-08: 10.0 µg/m³2025-10-09: 9.0 µg/m³2025-10-10: 10.8 µg/m³2025-10-11: 17.2 µg/m³2025-10-12: 15.9 µg/m³2025-10-13: 5.4 µg/m³2025-10-14: 8.0 µg/m³2025-10-15: no data2025-10-16: 5.2 µg/m³2025-10-17: 4.7 µg/m³2025-10-18: 5.9 µg/m³2025-10-19: 5.3 µg/m³2025-10-20: 7.2 µg/m³2025-10-21: 2.8 µg/m³2025-10-22: 4.8 µg/m³2025-10-23: 3.1 µg/m³2025-10-24: 3.3 µg/m³2025-10-25: 2.9 µg/m³2025-10-26: 3.8 µg/m³2025-10-27: 3.3 µg/m³2025-10-28: 4.3 µg/m³2025-10-29: 4.9 µg/m³2025-10-30: 5.4 µg/m³2025-10-31: 7.2 µg/m³2025-11-01: 4.7 µg/m³2025-11-02: 4.0 µg/m³2025-11-03: 4.0 µg/m³2025-11-04: 4.1 µg/m³2025-11-05: 5.5 µg/m³2025-11-06: 7.6 µg/m³2025-11-07: 12.3 µg/m³2025-11-08: 17.3 µg/m³2025-11-09: 20.4 µg/m³2025-11-10: 11.4 µg/m³2025-11-11: 6.2 µg/m³2025-11-12: 7.8 µg/m³2025-11-13: 6.8 µg/m³2025-11-14: 8.7 µg/m³2025-11-15: 18.4 µg/m³2025-11-16: 14.1 µg/m³2025-11-17: 4.8 µg/m³2025-11-18: 8.7 µg/m³2025-11-19: 4.4 µg/m³2025-11-20: 6.9 µg/m³2025-11-21: 13.6 µg/m³2025-11-22: 15.4 µg/m³2025-11-23: 11.7 µg/m³2025-11-24: 6.2 µg/m³2025-11-25: 11.0 µg/m³2025-11-26: 17.6 µg/m³2025-11-27: 13.7 µg/m³2025-11-28: no data2025-11-29: no data2025-11-30: no data2025-12-01: no data2025-12-02: 9.6 µg/m³2025-12-03: 13.1 µg/m³2025-12-04: 15.2 µg/m³2025-12-05: 15.6 µg/m³2025-12-06: 6.4 µg/m³2025-12-07: 5.3 µg/m³2025-12-08: 4.4 µg/m³2025-12-09: 5.4 µg/m³2025-12-10: 8.1 µg/m³2025-12-11: 8.4 µg/m³2025-12-12: 10.9 µg/m³2025-12-13: 15.6 µg/m³2025-12-14: 9.1 µg/m³2025-12-15: 9.6 µg/m³2025-12-16: 9.1 µg/m³2025-12-17: 13.5 µg/m³2025-12-18: 10.1 µg/m³2025-12-19: 6.5 µg/m³2025-12-20: 11.4 µg/m³2025-12-21: 10.8 µg/m³2025-12-22: 89.1 µg/m³2025-12-23: 11.9 µg/m³2025-12-24: 8.4 µg/m³2025-12-25: 13.0 µg/m³2025-12-26: 20.2 µg/m³2025-12-27: 20.2 µg/m³2025-12-28: 19.5 µg/m³2025-12-29: 18.4 µg/m³2025-12-30: 8.8 µg/m³2025-12-31: 15.3 µg/m³2026-01-01: 12.5 µg/m³2026-01-02: 4.0 µg/m³2026-01-03: 8.2 µg/m³2026-01-04: 8.3 µg/m³2026-01-05: 9.6 µg/m³2026-01-06: 15.7 µg/m³2026-01-07: no data2026-01-08: no data2026-01-09: 2.7 µg/m³2026-01-10: 14.2 µg/m³2026-01-11: 12.1 µg/m³2026-01-12: 9.0 µg/m³2026-01-13: 5.5 µg/m³2026-01-14: 8.2 µg/m³2026-01-15: 6.4 µg/m³2026-01-16: 5.0 µg/m³2026-01-17: no data2026-01-18: 13.0 µg/m³2026-01-19: 20.4 µg/m³2026-01-20: 21.9 µg/m³2026-01-21: 19.7 µg/m³2026-01-22: 23.3 µg/m³2026-01-23: 25.7 µg/m³2026-01-24: 31.9 µg/m³2026-01-25: 44.7 µg/m³2026-01-26: 49.0 µg/m³2026-01-27: 22.7 µg/m³2026-01-28: 21.4 µg/m³2026-01-29: 24.2 µg/m³2026-01-30: 15.8 µg/m³2026-01-31: 12.5 µg/m³2026-02-01: 16.0 µg/m³2026-02-02: 14.1 µg/m³2026-02-03: 21.5 µg/m³2026-02-04: 10.0 µg/m³2026-02-05: 24.6 µg/m³2026-02-06: 14.5 µg/m³2026-02-07: 11.4 µg/m³2026-02-08: 10.9 µg/m³2026-02-09: 9.3 µg/m³2026-02-10: 11.7 µg/m³2026-02-11: 6.3 µg/m³2026-02-12: 6.2 µg/m³2026-02-13: 8.8 µg/m³2026-02-14: 14.2 µg/m³2026-02-15: 13.4 µg/m³2026-02-16: 8.1 µg/m³2026-02-17: 6.6 µg/m³2026-02-18: 11.7 µg/m³2026-02-19: no data2026-02-20: no data2026-02-21: 8.0 µg/m³2026-02-22: 3.8 µg/m³2026-02-23: 6.8 µg/m³2026-02-24: 8.0 µg/m³2026-02-25: 7.2 µg/m³2026-02-26: 9.7 µg/m³2026-02-27: 10.9 µg/m³2026-02-28: 3.7 µg/m³2026-03-01: 4.7 µg/m³2026-03-02: 5.5 µg/m³2026-03-03: 12.2 µg/m³2026-03-04: 28.2 µg/m³2026-03-05: 17.9 µg/m³2026-03-06: 19.3 µg/m³2026-03-07: 33.0 µg/m³2026-03-08: 34.2 µg/m³2026-03-09: 29.7 µg/m³2026-03-10: 23.3 µg/m³2026-03-11: 7.1 µg/m³2026-03-12: 8.5 µg/m³2026-03-13: 4.2 µg/m³2026-03-14: 3.7 µg/m³2026-03-15: 8.5 µg/m³2026-03-16: 4.9 µg/m³2026-03-17: 8.7 µg/m³2026-03-18: 9.6 µg/m³2026-03-19: 26.2 µg/m³2026-03-20: 27.4 µg/m³2026-03-21: 13.6 µg/m³2026-03-22: 20.5 µg/m³2026-03-23: 24.5 µg/m³2026-03-24: 28.0 µg/m³2026-03-25: 7.9 µg/m³2026-03-26: 4.1 µg/m³2026-03-27: 7.4 µg/m³2026-03-28: 6.2 µg/m³2026-03-29: 5.3 µg/m³2026-03-30: 4.8 µg/m³2026-03-31: 8.0 µg/m³2026-04-01: 8.0 µg/m³2026-04-02: 12.4 µg/m³2026-04-03: 6.1 µg/m³2026-04-04: 7.4 µg/m³2026-04-05: 4.9 µg/m³2026-04-06: 5.4 µg/m³2026-04-07: 6.9 µg/m³2026-04-08: 6.6 µg/m³2026-04-09: 7.5 µg/m³2026-04-10: 8.6 µg/m³2026-04-11: 7.6 µg/m³2026-04-12: 4.8 µg/m³2026-04-13: 9.8 µg/m³2026-04-14: 19.2 µg/m³2026-04-15: 13.7 µg/m³2026-04-16: 8.1 µg/m³2026-04-17: 13.8 µg/m³2026-04-18: 14.3 µg/m³2026-04-19: 5.3 µg/m³2026-04-20: 7.3 µg/m³2026-04-21: 13.8 µg/m³2026-04-22: 8.9 µg/m³2026-04-23: 8.9 µg/m³2026-04-24: 10.7 µg/m³2026-04-25: 13.1 µg/m³2026-04-26: 6.9 µg/m³2026-04-27: 9.1 µg/m³2026-04-28: 8.2 µg/m³2026-04-29: 5.5 µg/m³2026-04-30: 5.6 µg/m³2026-05-01: 3.6 µg/m³2026-05-02: 6.5 µg/m³2026-05-03: no data2026-05-04: 8.1 µg/m³2026-05-05: 13.8 µg/m³2026-05-06: 7.6 µg/m³2026-05-07: 7.6 µg/m³2026-05-08: 11.6 µg/m³2026-05-09: 10.1 µg/m³2026-05-10: 13.2 µg/m³2026-05-11: 5.3 µg/m³2026-05-12: 4.8 µg/m³2026-05-13: 6.1 µg/m³2026-05-14: 3.4 µg/m³2026-05-15: 4.8 µg/m³2026-05-16: 5.1 µg/m³2026-05-17: 3.7 µg/m³2026-05-18: 4.7 µg/m³2026-05-19: 4.8 µg/m³2026-05-20: 5.7 µg/m³2026-05-21: 7.7 µg/m³2026-05-22: 10.6 µg/m³2026-05-23: 10.4 µg/m³2026-05-24: 10.4 µg/m³2026-05-25: no data2026-05-26: no data2026-05-27: 9.4 µg/m³2026-05-28: 7.2 µg/m³2026-05-29: 10.4 µg/m³2026-05-30: 11.3 µg/m³2026-05-31: 11.1 µg/m³2026-06-01: 7.0 µg/m³2026-06-02: 6.1 µg/m³2026-06-03: 4.1 µg/m³2026-06-04: 2.9 µg/m³2026-06-05: 5.0 µg/m³2026-06-06: 4.8 µg/m³2026-06-07: no data2026-06-08: no data2026-06-09: no data2026-06-10: no data2026-06-11: no data2026-06-12: no data2026-06-13: no data2026-06-14: no data2026-06-15: no data2026-06-16: no data2026-06-17: no data2026-06-18: 6.6 µg/m³2026-06-19: 9.3 µg/m³2026-06-20: 10.3 µg/m³2026-06-21: no data2026-06-22: no data2026-06-23: no data2026-06-24: 12.7 µg/m³2026-06-25: 18.7 µg/m³2026-06-26: 19.0 µg/m³2026-06-27: 19.2 µg/m³2026-06-28: 9.7 µg/m³2026-06-29: 4.6 µg/m³2026-06-30: 6.8 µg/m³2026-07-01: 6.8 µg/m³2026-07-02: 5.7 µg/m³2026-07-03: 4.7 µg/m³2026-07-04: 6.1 µg/m³2026-07-05: 3.6 µg/m³2026-07-06: 4.4 µg/m³2026-07-07: 4.5 µg/m³2026-07-08: 6.3 µg/m³2026-07-09: 10.2 µg/m³2026-07-10: 10.5 µg/m³2026-07-11: 8.3 µg/m³2026-07-12: no data2026-07-13: 11.2 µg/m³2026-07-14: 9.2 µg/m³2026-07-15: 10.7 µg/m³2026-07-16: 12.3 µg/m³2026-07-17: 13.6 µg/m³2026-07-18: 14.0 µg/m³2026-07-19: no data2026-07-20: 7.1 µg/m³2026-07-21: 6.8 µg/m³2026-07-22: 6.1 µg/m³2026-07-23: 5.7 µg/m³2026-07-24: 5.5 µg/m³2026-07-25: 8.6 µg/m³2026-07-26: 8.8 µg/m³2026-07-27: 6.3 µg/m³2026-07-28: 5.2 µg/m³2026-07-29: 7.6 µg/m³2026-07-30: 12.7 µg/m³2026-07-31: 16.5 µg/m³2026-08-01: 4.0 µg/m³2026-08-02: no data2026-08-03: 11.1 µg/m³2026-08-04: 10.4 µg/m³2026-08-05: 7.7 µg/m³2026-08-06: 6.1 µg/m³2026-08-07: 5.7 µg/m³2026-08-08: 4.7 µg/m³2026-08-09: 6.2 µg/m³2026-08-10: 6.6 µg/m³2026-08-11: 4.8 µg/m³2026-08-12: 5.6 µg/m³2026-08-13: 8.1 µg/m³2026-08-14: 9.2 µg/m³2026-08-15: 14.0 µg/m³2026-08-16: no data2026-08-17: 5.2 µg/m³2026-08-18: 10.2 µg/m³2026-08-19: 8.8 µg/m³2026-08-20: 6.1 µg/m³2026-08-21: 5.1 µg/m³2026-08-22: 4.5 µg/m³2026-08-23: no data2026-08-24: 6.4 µg/m³2026-08-25: 7.2 µg/m³2026-08-26: 9.4 µg/m³2026-08-27: 11.9 µg/m³2026-08-28: 6.3 µg/m³2026-08-29: 2.7 µg/m³2026-08-30: no data2026-08-31: 3.9 µg/m³2026-09-01: 6.6 µg/m³2026-09-02: 6.9 µg/m³2026-09-03: 4.4 µg/m³2026-09-04: 2.7 µg/m³2026-09-05: 5.3 µg/m³2026-09-06: no data2026-09-07: 5.3 µg/m³2026-09-08: 3.7 µg/m³2026-09-09: 4.0 µg/m³2026-09-10: 6.1 µg/m³2026-09-11: no data2026-09-12: no data2026-09-13: no data2026-09-14: no data2026-09-15: no data2026-09-16: 6.1 µg/m³2026-09-17: 3.8 µg/m³2026-09-18: 5.2 µg/m³2026-09-19: 7.6 µg/m³2026-09-20: no data2026-09-21: no data2026-09-22: no data2026-09-23: 8.6 µg/m³2026-09-24: 7.2 µg/m³2026-09-25: no data2026-09-26: no data2026-09-27: no data2026-09-28: no data2026-09-29: 16.5 µg/m³. Likely fire smoke2026-09-30: 11.8 µg/m³
50 of 315 measured days were over the WHO 24-hour guideline (15 µg/m³). One row per month, one square per local day; outlined days are named in the notes above.
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+

Last 4 days, hour by hour

15302026-09-30 23:00 UTC: 11.6 µg/m³2026-10-01 00:00 UTC: 10.9 µg/m³2026-10-01 01:00 UTC: 10.9 µg/m³2026-10-01 02:00 UTC: 12.0 µg/m³2026-10-01 03:00 UTC: 11.3 µg/m³2026-10-01 04:00 UTC: 12.9 µg/m³2026-10-01 05:00 UTC: 7.7 µg/m³2026-10-01 06:00 UTC: 6.7 µg/m³2026-10-01 07:00 UTC: 7.1 µg/m³2026-10-01 08:00 UTC: 6.3 µg/m³2026-10-01 10:00 UTC: 8.3 µg/m³2026-10-01 11:00 UTC: 8.1 µg/m³2026-10-01 12:00 UTC: 8.9 µg/m³2026-10-01 13:00 UTC: 7.7 µg/m³2026-10-01 14:00 UTC: 6.2 µg/m³2026-10-01 15:00 UTC: 7.6 µg/m³2026-10-01 16:00 UTC: 7.7 µg/m³Sep 28Sep 29Sep 30Oct 1
Times in UTC. Dashed line: WHO 24-hour guideline (15 µg/m³).

Its world rank, day by day

#1#2060NovDecJanFebMarAprMayJunJulAugSep
Rank on each day's board (1 = most polluted city that day).

2026 against 2025, month by month

15Jan 2025: 13.2 µg/m³Jan 2026: 16.7 µg/m³JanFeb 2025: 23.3 µg/m³Feb 2026: 10.7 µg/m³FebMar 2025: 17.9 µg/m³Mar 2026: 14.4 µg/m³MarApr 2025: 12.2 µg/m³Apr 2026: 8.9 µg/m³AprMay 2025: 7.9 µg/m³May 2026: 7.8 µg/m³MayJun 2025: 8.8 µg/m³Jun 2026: 9.2 µg/m³JunJul 2025: 6.6 µg/m³Jul 2026: 8.2 µg/m³JulAug 2025: 8.2 µg/m³Aug 2026: 7.1 µg/m³AugSep 2025: 6.3 µg/m³Sep 2026: 6.6 µg/m³SepOct 2025: 6.5 µg/m³OctNov 2025: 9.9 µg/m³NovDec 2025: 14.1 µg/m³Dec
Faded bars: 2025. A month shows once it has 10 measured days.

Monitors

StationOperatorType
Krefeld-LinnODC-BYEEAReference
Krefeld (Hafen)ODC-BYEEAReference

The city's value is the median of its reference monitors each hour; low-cost sensors are listed but not counted when reference monitors exist. Data via OpenAQ; licences as listed. How we rank. Embed this on your site.

Other cities in Germany

30-day averages, µg/m³. All of Germany.

Updated 2026-10-01 18:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.