SmogRank / Germany / Bremen / Bremen

Bremen, month by month

Bremen has a measured daily mean on 460 days since 11 January 2023. Its worst month was February 2023, at 59 US AQI (13.6 µg/m³), 443rd of 1,129 cities on that month's world ranking. Its cleanest was September 2026, at 28 US AQI (5.1 µg/m³).

Every month since 2023

2026too few days for a mean (a year needs 199)105 days measured
JannoneFebnoneMarnoneAprnoneMaynoneJun13 daysJul32#2,469Aug31#2,606Sep28#2,284Oct46#907
2025too few days for a mean (a year needs 256)0 days measured
JannoneFebnoneMarnoneAprnoneMaynoneJunnoneJulnoneAugnoneSepnoneOctnoneNovnoneDecnone
2024too few days for a mean (a year needs 257)34 days measured
Jan49#1,039Feb2 daysMar3 daysAprnoneMaynoneJunnoneJulnoneAugnoneSepnoneOctnoneNovnoneDecnone
202348 for the year321 days measured731st of 1,355 in the world
Jan7 daysFeb59#443Mar44#496Apr56#267May43#975Jun48#989Jul41#930Aug38#1,390Sep50#792Oct37#1,230Nov37#1,514Dec52#850
Each square is a month's mean PM2.5 in US AQI from Bremen's measured days, with its place on that month's world ranking under it. A month has a mean once 70% of its days are measured, the rule the monthly rankings use; under that, the square gives the days measured. Each square opens that month's ranking with Bremen marked; each year, the year's. A dashed square is the running month, so far.
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

Months without a mean, and why

30 months
MonthWhy
Jun 202613 of 30 days measured; a month needs 21. The others: 17 with under 18 hours of readings or readings that failed our checks.
May 2026No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Apr 2026No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Mar 2026No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Feb 2026No day measured. The others: 28 with under 18 hours of readings or readings that failed our checks.
Jan 2026No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Dec 2025No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Nov 2025No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Oct 2025No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Sep 2025No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Aug 2025No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jul 2025No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jun 2025No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
May 2025No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Apr 2025No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Mar 2025No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Feb 2025No day measured. The others: 28 with under 18 hours of readings or readings that failed our checks.
Jan 2025No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Dec 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Nov 2024No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Oct 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Sep 2024No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Aug 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jul 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jun 2024No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
May 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Apr 2024No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Mar 20243 of 31 days measured; a month needs 22. The others: 28 with under 18 hours of readings or readings that failed our checks.
Feb 20242 of 29 days measured; a month needs 21. The others: 27 with under 18 hours of readings or readings that failed our checks.
Jan 20237 of 31 days measured; a month needs 22. The others: 14 with under 18 hours of readings or readings that failed our checks.

A day counts once 18 hours of it are measured; a month needs 70% of its days.

Bremen's worst months

MonthUS AQIDays measuredWorld rankEpisode
February 2023 5913.6 µg/m³27 of 28443rdof 1,129Europe, 6 to 25 February 2023
April 2023 5611.9 µg/m³30 of 30267thof 1,622Europe, April 2023
December 2023 529.4 µg/m³26 of 31850thof 2,247–
September 2023 509.0 µg/m³30 of 30792ndof 2,176–
January 2024 498.9 µg/m³29 of 311,039thof 2,385–
June 2023 488.7 µg/m³30 of 30989thof 1,603–

Monthly means over the days measured; finished months only. World rank: its place on that month's world ranking of every city with enough days. Each month opens that ranking.

Bremen's worst days

DayUS AQIEpisode
16 Feb 2023 11541.0 µg/m³Europe, 6 to 25 February 2023
9 Apr 2023 9030.3 µg/m³Europe, April 2023
8 Feb 2023 8125.1 µg/m³Europe, 6 to 25 February 2023
23 Feb 2023 7923.9 µg/m³Europe, 6 to 25 February 2023
9 Feb 2023 7722.9 µg/m³Europe, 6 to 25 February 2023
15 Feb 2023 7622.4 µg/m³Europe, 6 to 25 February 2023
11 Jan 2024 7622.4 µg/m³–
10 Feb 2023 7522.1 µg/m³Europe, 6 to 25 February 2023
10 Apr 2023 7521.8 µg/m³Europe, April 2023
17 Apr 2023 7220.4 µg/m³–

Daily means, the highest since 11 Jan 2023; the WHO's daily guideline is 15 µg/m³. Each date opens that day's world ranking, and each episode the bad-air spell it was part of.

Use this history

SmogRank, PM2.5 monthly and daily means, Bremen, Germany, 11 Jan 2023 – 11 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/de/bremen/history (accessed 12 Oct 2026).

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You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.

Bremen now: the last 24 hours, its ranks today and the last 12 months day by day.

Updated 2026-10-12 18:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index. Some low-cost readings: Sensor.Community, ODbL (data and licence). Some readings: Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Vietnam's government monitors; Aurassure; Umhverfisstofnun (Environment Agency of Iceland); RMCAB (Secretaría Distrital de Ambiente, Bogotá); Love My Air (City and County of Denver), no reuse terms published (why we use them).