SmogRank / Romania / Iași County / Holboca
Holboca, month by month
Holboca has a measured daily mean on 1,027 days since 1 January 2023. Its worst month was January 2025, at 82 US AQI (26.0 µg/m³), 142nd of 2,474 cities on that month's world ranking. Its cleanest was May 2025, at 38 US AQI (6.9 µg/m³). 2025 averaged 59 US AQI (13.5 µg/m³), against 56 US AQI (11.7 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
14 months
| Month | Why |
|---|---|
| Oct 2026 | 7 of 11 days measured; a month needs 8. The others: 4 with readings for part of the day (a day needs 18 hours). |
| Jun 2026 | 18 of 30 days measured; a month needs 21. The others: 12 with under 18 hours of readings or readings that failed our checks. |
| Jan 2026 | 19 of 31 days measured; a month needs 22. The others: 12 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 | 12 of 30 days measured; a month needs 21. The others: 18 with under 18 hours of readings or readings that failed our checks. |
| Oct 2025 | 20 of 31 days measured; a month needs 22. The others: 11 with under 18 hours of readings or readings that failed our checks. |
| Jun 2025 | 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 | 12 of 31 days measured; a month needs 22. The others: 19 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 | 12 of 31 days measured; a month needs 22. The others: 19 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. |
| Jun 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 | 10 of 31 days measured; a month needs 22. The others: 20 missing from OpenAQ's archive, 1 with under 18 hours of readings or readings that failed our checks. |
| Feb 2023 | 3 of 28 days measured; a month needs 20. The others: 25 missing from OpenAQ's archive. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Holboca's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| January 2025 | 8226.0 µg/m³ | 142ndof 2,474 | Romania, Bulgaria and Serbia, January 2025 Germany, France and 19 more countries, January 2025 |
| November 2024 | 7924.3 µg/m³ | 117thof 2,624 | Eastern Europe, 25 to 29 November 2024 Southern Europe, November 2024and 2 more |
| January 2024 | 7823.8 µg/m³ | 198thof 2,385 | Europe, 27 January to 2 February 2024 South-eastern Europe, 28 December 2023 to 1 January 2024 |
| December 2023 | 7722.9 µg/m³ | 113thof 2,247 | South-eastern Europe, 28 December 2023 to 1 January 2024 Eastern Europe, December 2023and 1 more |
| February 2025 | 7622.3 µg/m³ | 395thof 2,633 | Europe, 1 to 14 February 2025 |
| March 2026 | 7119.8 µg/m³ | 612thof 2,971 | Romania and Bulgaria, March 2026 |
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.
Holboca's worst days
| Day | US AQI | Episode |
|---|---|---|
| 20 Jan 2026 | 185104.0 µg/m³ | Europe, January and February 2026 |
| 21 Jan 2026 | 16372.2 µg/m³ | Europe, January and February 2026 |
| 8 Nov 2024 | 16169.7 µg/m³ | Europe, November 2024 |
| 30 Dec 2023 | 15763.4 µg/m³ | South-eastern Europe, 28 December 2023 to 1 January 2024 |
| 7 Nov 2024 | 15662.9 µg/m³ | Europe, November 2024 |
| 20 Jan 2025 | 15560.6 µg/m³ | Germany, France and 19 more countries, January 2025 |
| 11 Jan 2024 | 15459.8 µg/m³ | – |
| 1 Jan 2023 | 15055.2 µg/m³ | Eastern Europe, January 2023 |
| 31 Dec 2023 | 14553.2 µg/m³ | South-eastern Europe, 28 December 2023 to 1 January 2024 |
| 14 Jan 2026 | 14252.3 µg/m³ | Europe, January and February 2026 |
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, Holboca, Romania, 1 Jan 2023 – 10 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/ro/holboca/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.
Holboca 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).