SmogRank / Czechia / Plzeň Region / Rokycany
Rokycany, month by month
Rokycany has a measured daily mean on 594 days since 21 January 2023. Its worst month was January 2024, at 78 US AQI (23.6 µg/m³), 200th of 2,385 cities on that month's world ranking. Its cleanest was May 2024, at 37 US AQI (6.7 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
34 months
| Month | Why |
|---|---|
| Oct 2026 | 5 of 12 days measured; a month needs 9. The others: 1 with no readings from the monitor, 4 with readings for part of the day (a day needs 18 hours), 2 with under 18 hours of readings or readings that failed our checks. |
| 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 readings for part of the day (a day needs 18 hours). |
| Jul 2026 | No day measured. The others: 31 with readings for part of the day (a day needs 18 hours). |
| Jun 2026 | 3 of 30 days measured; a month needs 21. The others: 26 with readings for part of the day (a day needs 18 hours), 1 with readings left out by our checks. |
| May 2026 | 11 of 31 days measured; a month needs 22. The others: 20 with readings for part of the day (a day needs 18 hours). |
| Apr 2026 | 4 of 30 days measured; a month needs 21. The others: 26 with readings for part of the day (a day needs 18 hours). |
| Mar 2026 | 3 of 31 days measured; a month needs 22. The others: 28 with readings for part of the day (a day needs 18 hours). |
| Feb 2026 | 3 of 28 days measured; a month needs 20. The others: 25 with readings for part of the day (a day needs 18 hours). |
| Jan 2026 | 10 of 31 days measured; a month needs 22. The others: 21 with readings for part of the day (a day needs 18 hours). |
| Dec 2025 | 14 of 31 days measured; a month needs 22. The others: 17 with readings for part of the day (a day needs 18 hours). |
| Nov 2025 | 11 of 30 days measured; a month needs 21. The others: 19 with readings for part of the day (a day needs 18 hours). |
| Oct 2025 | 9 of 31 days measured; a month needs 22. The others: 22 with readings for part of the day (a day needs 18 hours). |
| Sep 2025 | 17 of 30 days measured; a month needs 21. The others: 13 with readings for part of the day (a day needs 18 hours). |
| Aug 2025 | 16 of 31 days measured; a month needs 22. The others: 15 with readings for part of the day (a day needs 18 hours). |
| Jul 2025 | 7 of 31 days measured; a month needs 22. The others: 24 with readings for part of the day (a day needs 18 hours). |
| Jun 2025 | 2 of 30 days measured; a month needs 21. The others: 28 with readings for part of the day (a day needs 18 hours). |
| May 2025 | 12 of 31 days measured; a month needs 22. The others: 1 with no readings from the monitor, 18 with readings for part of the day (a day needs 18 hours). |
| Apr 2025 | 15 of 30 days measured; a month needs 21. The others: 15 with readings for part of the day (a day needs 18 hours). |
| Mar 2025 | 10 of 31 days measured; a month needs 22. The others: 21 with readings for part of the day (a day needs 18 hours). |
| Feb 2025 | 16 of 28 days measured; a month needs 20. The others: 12 with readings for part of the day (a day needs 18 hours). |
| Jan 2025 | 15 of 31 days measured; a month needs 22. The others: 1 with no readings from the monitor, 15 with readings for part of the day (a day needs 18 hours). |
| Oct 2024 | 11 of 31 days measured; a month needs 22. The others: 20 with readings for part of the day (a day needs 18 hours). |
| Sep 2024 | No day measured. The others: 30 with readings for part of the day (a day needs 18 hours). |
| Aug 2024 | 1 of 31 days measured; a month needs 22. The others: 16 with no readings from the monitor, 14 with readings for part of the day (a day needs 18 hours). |
| Jun 2024 | No day measured. The others: 20 with no readings from the monitor, 10 with readings for part of the day (a day needs 18 hours). |
| Mar 2024 | 15 of 31 days measured; a month needs 22. The others: 10 with no readings from the monitor, 6 with readings for part of the day (a day needs 18 hours). |
| Dec 2023 | No day measured. The others: 31 with no readings from the monitor. |
| Nov 2023 | 8 of 30 days measured; a month needs 21. The others: 3 with no readings from the monitor, 19 with readings for part of the day (a day needs 18 hours). |
| Aug 2023 | 17 of 31 days measured; a month needs 22. The others: 2 with no readings from the monitor, 12 with readings for part of the day (a day needs 18 hours). |
| Jul 2023 | 21 of 31 days measured; a month needs 22. The others: 3 with no readings from the monitor, 6 with readings for part of the day (a day needs 18 hours), 1 missing from OpenAQ's archive. |
| Mar 2023 | 5 of 31 days measured; a month needs 22. The others: 6 with readings for part of the day (a day needs 18 hours), 20 missing from OpenAQ's archive. |
| Feb 2023 | 1 of 28 days measured; a month needs 20. The others: 2 with readings for part of the day (a day needs 18 hours), 25 missing from OpenAQ's archive. |
| Jan 2023 | 10 of 31 days measured; a month needs 22. The others: 1 missing from OpenAQ's archive. |
A day counts once 18 hours of it are measured; a month needs 70% of its days.
Rokycany's worst months
| Month | US AQI | World rank | Episode |
|---|---|---|---|
| January 2024 | 7823.6 µg/m³ | 200thof 2,385 | Europe, 27 January to 2 February 2024 Europe, 28 to 31 January 2024and 1 more |
| November 2024 | 5812.8 µg/m³ | 518thof 2,624 | Europe, November 2024 |
| December 2024 | 5611.7 µg/m³ | 700thof 2,616 | Europe, 24 December 2024 to 3 January 2025 |
| April 2023 | 5410.8 µg/m³ | 338thof 1,622 | – |
| June 2023 | 5410.8 µg/m³ | 674thof 1,603 | – |
| September 2023 | 5310.1 µg/m³ | 579thof 2,176 | – |
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.
Rokycany's worst days
| Day | US AQI | Episode |
|---|---|---|
| 30 Mar 2024 | 15055.2 µg/m³ | Europe, March and April 2024 |
| 10 Jan 2024 | 13247.9 µg/m³ | Europe, 8 to 27 January 2024 |
| 24 Jan 2026 | 12043.1 µg/m³ | Europe, January and February 2026 |
| 9 Feb 2025 | 11742.2 µg/m³ | Europe, 1 to 14 February 2025 |
| 31 Mar 2024 | 11742.1 µg/m³ | Europe, March and April 2024 |
| 21 Feb 2025 | 11742.1 µg/m³ | Europe, 14 February to 1 March 2025 |
| 31 Jan 2024 | 11641.6 µg/m³ | Europe, 27 January to 2 February 2024 Europe, 28 to 31 January 2024 |
| 11 Jan 2024 | 11641.4 µg/m³ | Europe, 8 to 27 January 2024 |
| 12 Jan 2024 | 11039.1 µg/m³ | Europe, 8 to 27 January 2024 |
| 23 Jan 2026 | 10838.3 µg/m³ | Europe, January and February 2026 |
Daily means, the highest since 21 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, Rokycany, Czechia, 21 Jan 2023 – 11 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/cz/rokycany/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.
Rokycany now: the last 24 hours, its ranks today and the last 12 months day by day.
Updated 2026-10-12 21:07 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).