SmogRank / Germany / Bavaria / Trostberg an der Alz
Trostberg an der Alz, month by month
Trostberg an der Alz has a measured daily mean on 1,071 days since 14 February 2023. Its worst month was February 2025, at 74 US AQI (21.7 µg/m³), 440th of 2,633 cities on that month's world ranking. Its cleanest was May 2024, at 29 US AQI (5.2 µg/m³). 2025 averaged 53 US AQI (10.4 µg/m³), against 47 US AQI (8.4 µg/m³) in 2023.
Every month since 2023
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
9 months
| Month | Why |
|---|---|
| Oct 2025 | 17 of 31 days measured; a month needs 22. The others: 14 with under 18 hours of readings or readings that failed our checks. |
| Jun 2025 | 20 of 30 days measured; a month needs 21. The others: 10 with under 18 hours of readings or readings that failed our checks. |
| Oct 2024 | 9 of 31 days measured; a month needs 22. The others: 22 with under 18 hours of readings or readings that failed our checks. |
| Sep 2024 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Aug 2024 | 14 of 31 days measured; a month needs 22. The others: 17 with under 18 hours of readings or readings that failed our checks. |
| Mar 2024 | 15 of 31 days measured; a month needs 22. The others: 16 with under 18 hours of readings or readings that failed our checks. |
| Nov 2023 | 16 of 30 days measured; a month needs 21. The others: 14 with under 18 hours of readings or readings that failed our checks. |
| Mar 2023 | 11 of 31 days measured; a month needs 22. The others: 20 missing from OpenAQ's archive. |
| Feb 2023 | 2 of 28 days measured; a month needs 20. The others: 13 missing from OpenAQ's archive. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Trostberg an der Alz's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| February 2025 | 7421.7 µg/m³ | 440thof 2,633 | Europe, 14 February to 1 March 2025 Europe, 1 to 14 February 2025 |
| January 2026 | 6516.6 µg/m³ | 652ndof 2,617 | Europe, January and February 2026 |
| January 2025 | 5813.1 µg/m³ | 608thof 2,474 | Europe, 24 December 2024 to 3 January 2025 |
| January 2024 | 5712.3 µg/m³ | 669thof 2,385 | Europe, 8 to 27 January 2024 |
| December 2024 | 5612.0 µg/m³ | 675thof 2,616 | Europe, 24 December 2024 to 3 January 2025 |
| November 2025 | 5511.5 µg/m³ | 813thof 2,715 | – |
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.
Trostberg an der Alz's worst days
| Day | US AQI | Episode |
|---|---|---|
| 30 Mar 2024 | 17893.7 µg/m³ | Europe, March and April 2024 |
| 1 Jan 2025 | 15460.4 µg/m³ | Europe, 24 December 2024 to 3 January 2025 |
| 8 Nov 2023 | 13750.1 µg/m³ | – |
| 9 Feb 2025 | 12545.4 µg/m³ | Europe, 1 to 14 February 2025 |
| 10 Feb 2025 | 11641.7 µg/m³ | Europe, 1 to 14 February 2025 |
| 23 Jan 2026 | 11641.4 µg/m³ | Europe, January and February 2026 |
| 24 Jan 2026 | 11139.4 µg/m³ | Europe, January and February 2026 |
| 25 Jan 2026 | 10436.8 µg/m³ | Europe, January and February 2026 |
| 22 Jan 2026 | 9733.9 µg/m³ | Europe, January and February 2026 |
| 20 Feb 2025 | 9532.6 µg/m³ | Europe, 14 February to 1 March 2025 |
Daily means, the highest since 14 Feb 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, Trostberg an der Alz, Germany, 14 Feb 2023 – 10 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/de/trostberg-an-der-alz/history (accessed 12 Oct 2026).
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.
Trostberg an der Alz now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 20:07 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).