SmogRank / Czechia / Olomouc Region / Přerov
Přerov, month by month
Přerov has a measured daily mean on 675 days since 11 January 2023. Its worst month was January 2024, at 81 US AQI (25.0 µg/m³), 174th of 2,385 cities on that month's world ranking. Its cleanest was May 2024, at 50 US AQI (9.0 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
30 months
| Month | Why |
|---|---|
| Oct 2026 | 6 of 12 days measured; a month needs 9. The others: 6 with readings for part of the day (a day needs 18 hours). |
| Sep 2026 | 1 of 30 days measured; a month needs 21. The others: 29 with readings for part of the day (a day needs 18 hours). |
| Aug 2026 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Jul 2026 | No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks. |
| Jun 2026 | 4 of 30 days measured; a month needs 21. The others: 26 with under 18 hours of readings or readings that failed our checks. |
| May 2026 | 10 of 31 days measured; a month needs 22. The others: 21 with under 18 hours of readings or readings that failed our checks. |
| Apr 2026 | 5 of 30 days measured; a month needs 21. The others: 25 with under 18 hours of readings or readings that failed our checks. |
| Mar 2026 | 3 of 31 days measured; a month needs 22. The others: 28 with under 18 hours of readings or readings that failed our checks. |
| Feb 2026 | 3 of 28 days measured; a month needs 20. The others: 25 with under 18 hours of readings or readings that failed our checks. |
| Jan 2026 | 10 of 31 days measured; a month needs 22. The others: 21 with under 18 hours of readings or readings that failed our checks. |
| Dec 2025 | 14 of 31 days measured; a month needs 22. The others: 17 with under 18 hours of readings or readings that failed our checks. |
| Nov 2025 | 11 of 30 days measured; a month needs 21. The others: 19 with under 18 hours of readings or readings that failed our checks. |
| Oct 2025 | 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 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. |
| Aug 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. |
| Jul 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. |
| Jun 2025 | 1 of 30 days measured; a month needs 21. The others: 29 with under 18 hours of readings or readings that failed our checks. |
| May 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. |
| Apr 2025 | 15 of 30 days measured; a month needs 21. The others: 15 with under 18 hours of readings or readings that failed our checks. |
| Mar 2025 | 6 of 31 days measured; a month needs 22. The others: 25 with under 18 hours of readings or readings that failed our checks. |
| Feb 2025 | 16 of 28 days measured; a month needs 20. The others: 12 with under 18 hours of readings or readings that failed our checks. |
| Jan 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. |
| 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 | 1 of 31 days measured; a month needs 22. The others: 30 with under 18 hours of readings or readings that failed our checks. |
| Jun 2024 | No day measured. The others: 30 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. |
| Apr 2023 | 3 of 30 days measured; a month needs 21. The others: 27 with under 18 hours of readings or readings that failed our checks. |
| Mar 2023 | 20 of 31 days measured; a month needs 22. The others: 11 with under 18 hours of readings or readings that failed our checks. |
| Jan 2023 | 7 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.
Přerov's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| January 2024 | 8125.0 µg/m³ | 174thof 2,385 | Europe, 27 January to 2 February 2024 Europe, 8 to 27 January 2024 |
| December 2024 | 7723.2 µg/m³ | 168thof 2,616 | Europe, 24 December 2024 to 3 January 2025 |
| December 2023 | 7622.4 µg/m³ | 118thof 2,247 | Czechia, Slovakia and 2 more countries, December 2023 Europe, December 2023and 1 more |
| November 2024 | 7421.2 µg/m³ | 182ndof 2,624 | Eastern Europe, 25 to 29 November 2024 Europe, November 2024and 1 more |
| February 2023 | 7120.0 µg/m³ | 133rdof 1,129 | Europe, 28 February to 4 March 2023 Europe, 6 to 25 February 2023 |
| September 2023 | 5813.1 µg/m³ | 254thof 2,176 | Eastern and northern Europe, September 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.
Přerov's worst days
| Day | US AQI | Episode |
|---|---|---|
| 24 Jan 2026 | 18299.6 µg/m³ | Europe, January and February 2026 |
| 10 Jan 2024 | 17589.4 µg/m³ | Europe, 8 to 27 January 2024 |
| 7 Dec 2023 | 17386.8 µg/m³ | Europe, December 2023 |
| 23 Jan 2026 | 17285.5 µg/m³ | Europe, January and February 2026 |
| 11 Jan 2024 | 17285.2 µg/m³ | Europe, 8 to 27 January 2024 |
| 27 Dec 2024 | 16170.2 µg/m³ | Europe, 24 December 2024 to 3 January 2025 |
| 25 Jan 2026 | 16169.5 µg/m³ | Europe, January and February 2026 |
| 29 Dec 2024 | 15560.6 µg/m³ | Europe, 24 December 2024 to 3 January 2025 |
| 30 Dec 2024 | 15459.8 µg/m³ | Europe, 24 December 2024 to 3 January 2025 |
| 28 Dec 2024 | 15358.7 µg/m³ | Europe, 24 December 2024 to 3 January 2025 |
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, Přerov, Czechia, 11 Jan 2023 – 12 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/cz/prerov/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.
Přerov now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 22:07 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).