SmogRank / Norway / Østfold / Moss
Moss, month by month
Moss has a measured daily mean on 924 days since 1 January 2023. Its worst month was January 2024, at 67 US AQI (17.6 µg/m³), 350th of 2,385 cities on that month's world ranking. Its cleanest was May 2025, at 27 US AQI (4.8 µg/m³). 2025 averaged 42 US AQI (7.6 µg/m³), against 49 US AQI (8.8 µg/m³) in 2024.
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
17 months
| Month | Why |
|---|---|
| Oct 2026 | No day measured. The others: 11 with no readings from the monitor. |
| Sep 2026 | No day measured. The others: 5 with no readings from the monitor, 24 with readings for part of the day (a day needs 18 hours), 1 with under 18 hours of readings or readings that failed our checks. |
| Aug 2026 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Jul 2026 | 2 of 31 days measured; a month needs 22. The others: 29 with under 18 hours of readings or readings that failed our checks. |
| Dec 2025 | 19 of 31 days measured; a month needs 22. The others: 12 with under 18 hours of readings or readings that failed our checks. |
| Nov 2025 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Oct 2025 | 7 of 31 days measured; a month needs 22. The others: 24 with under 18 hours of readings or readings that failed our checks. |
| Oct 2024 | 21 of 31 days measured; a month needs 22. The others: 10 with under 18 hours of readings or readings that failed our checks. |
| Sep 2024 | 7 of 30 days measured; a month needs 21. The others: 23 with under 18 hours of readings or readings that failed our checks. |
| Dec 2023 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Nov 2023 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Oct 2023 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Sep 2023 | 4 of 30 days measured; a month needs 21. The others: 26 with under 18 hours of readings or readings that failed our checks. |
| Aug 2023 | 4 of 31 days measured; a month needs 22. The others: 27 with under 18 hours of readings or readings that failed our checks. |
| Jul 2023 | 4 of 31 days measured; a month needs 22. The others: 27 with under 18 hours of readings or readings that failed our checks. |
| Jun 2023 | 11 of 30 days measured; a month needs 21. The others: 19 with under 18 hours of readings or readings that failed our checks. |
| May 2023 | 17 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.
Moss's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| January 2024 | 6717.6 µg/m³ | 350thof 2,385 | Southern Norway, 12 to 13 January 2024 Southern Norway, 5 to 10 January 2024 |
| February 2025 | 5812.9 µg/m³ | 970thof 2,633 | Europe, 14 February to 1 March 2025 |
| March 2026 | 5611.7 µg/m³ | 1,272ndof 2,971 | – |
| March 2025 | 5310.2 µg/m³ | 1,562ndof 2,862 | Germany, Poland and 25 more countries, March 2025 Europe, 14 February to 1 March 2025 |
| March 2024 | 529.8 µg/m³ | 448thof 1,698 | – |
| February 2023 | 529.4 µg/m³ | 705thof 1,129 | Europe, 6 to 25 February 2023 |
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.
Moss's worst days
| Day | US AQI | Episode |
|---|---|---|
| 10 Jan 2024 | 14452.8 µg/m³ | Southern Norway, 5 to 10 January 2024 |
| 9 Jan 2024 | 11742.1 µg/m³ | Southern Norway, 5 to 10 January 2024 |
| 7 Mar 2025 | 10436.6 µg/m³ | Germany, Poland and 25 more countries, March 2025 |
| 6 Jan 2024 | 9532.5 µg/m³ | Southern Norway, 5 to 10 January 2024 |
| 8 Jan 2024 | 9331.9 µg/m³ | Southern Norway, 5 to 10 January 2024 |
| 22 Feb 2025 | 9231.3 µg/m³ | Europe, 14 February to 1 March 2025 |
| 13 Jan 2024 | 9030.1 µg/m³ | Southern Norway, 12 to 13 January 2024 |
| 12 Jan 2024 | 8929.6 µg/m³ | Southern Norway, 12 to 13 January 2024 |
| 4 Jan 2025 | 8527.2 µg/m³ | Southern Norway, 4 January 2025 |
| 7 Jan 2024 | 8426.6 µg/m³ | Southern Norway, 5 to 10 January 2024 |
Daily means, the highest since 1 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, Moss, Norway, 1 Jan 2023 – 2 Jul 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/no/moss/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.
Moss now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 17:07 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).