SmogRank / Malta / Il-Mosta / Mosta
Mosta, month by month
Mosta has a measured daily mean on 979 days since 1 January 2023. Its worst month was July 2023, at 72 US AQI (20.5 µg/m³), 72nd of 1,432 cities on that month's world ranking. Its cleanest was December 2023, at 29 US AQI (5.2 µg/m³).
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 |
|---|---|
| Sep 2026 | 14 of 30 days measured; a month needs 21. The others: 4 with readings for part of the day (a day needs 18 hours), 12 with under 18 hours of readings or readings that failed our checks. |
| Aug 2026 | 4 of 31 days measured; a month needs 22. The others: 27 with under 18 hours of readings or readings that failed our checks. |
| Dec 2025 | 12 of 31 days measured; a month needs 22. The others: 19 with under 18 hours of readings or readings that failed our checks. |
| Jul 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. |
| Jun 2025 | 14 of 30 days measured; a month needs 21. The others: 16 with under 18 hours of readings or readings that failed our checks. |
| May 2025 | 15 of 31 days measured; a month needs 22. The others: 16 with under 18 hours of readings or readings that failed our checks. |
| Mar 2025 | 16 of 31 days measured; a month needs 22. The others: 15 with under 18 hours of readings or readings that failed our checks. |
| Nov 2024 | 18 of 30 days measured; a month needs 21. The others: 12 with under 18 hours of readings or readings that failed our checks. |
| Oct 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. |
| Sep 2024 | No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Aug 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. |
| 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. |
| Jan 2024 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Nov 2023 | 20 of 30 days measured; a month needs 21. The others: 10 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 | 3 of 28 days measured; a month needs 20. The others: 25 missing from OpenAQ's archive. |
| Jan 2023 | 21 of 31 days measured; a month needs 22. The others: 6 missing from OpenAQ's archive, 4 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.
Mosta's worst months
| Month | US AQI | World rank |
|---|---|---|
| July 2023 | 7220.5 µg/m³ | 72ndof 1,432 |
| April 2026 | 6415.9 µg/m³ | 529thof 2,941 |
| August 2023 | 6114.7 µg/m³ | 202ndof 1,980 |
| May 2024 | 6114.5 µg/m³ | 301stof 2,684 |
| January 2026 | 6114.4 µg/m³ | 786thof 2,617 |
| July 2024 | 6114.3 µg/m³ | 208thof 2,566 |
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.
Mosta's worst days
| Day | US AQI |
|---|---|
| 13 Apr 2026 | 17793.1 µg/m³ |
| 14 Apr 2026 | 16372.1 µg/m³ |
| 29 Mar 2024 | 16067.7 µg/m³ |
| 27 Mar 2024 | 15763.8 µg/m³ |
| 17 Jul 2023 | 15561.9 µg/m³ |
| 25 Jul 2023 | 13449.0 µg/m³ |
| 18 Jan 2023 | 13147.8 µg/m³ |
| 23 Mar 2025 | 13047.1 µg/m³ |
| 24 Mar 2025 | 12545.3 µg/m³ |
| 5 Jan 2026 | 12545.3 µg/m³ |
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, Mosta, Malta, 1 Jan 2023 – 11 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/mt/mosta/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.
Mosta 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).