SmogRank / Czechia / Central Bohemia / Beroun

Beroun, month by month

Beroun has a measured daily mean on 674 days since 1 January 2023. Its worst month was January 2024, at 84 US AQI (26.6 µg/m³), 153rd of 2,385 cities on that month's world ranking. Its cleanest was May 2024, at 48 US AQI (8.6 µg/m³).

Every month since 2023

2026too few days for a mean (a year needs 200)36 days measured
Jan9 daysFeb2 daysMar2 daysApr4 daysMay9 daysJun4 daysJulnoneAugnoneSep1 dayOct5 days
2025too few days for a mean (a year needs 256)133 days measured
Jan14 daysFeb15 daysMar10 daysApr13 daysMay11 daysJun1 dayJul7 daysAug16 daysSep18 daysOct8 daysNov9 daysDec11 days
2024too few days for a mean (a year needs 257)215 days measured
Jan84#153Feb58#419Mar15 daysApr51#1,107May48#1,094JunnoneJul49#1,046Aug1 daySepnoneOct9 daysNov68#273Dec66#374
202361 for the year290 days measured130th of 1,355 in the world
Jan62#240Feb69#164Mar64#65Apr60#194May58#217Jun59#457Jul21 daysAug15 daysSep60#209Oct59#135Nov19 daysDec72#155
Each square is a month's mean PM2.5 in US AQI from Beroun's measured days, with its place on that month's world ranking under it. A month has a mean once 70% of its days are measured, the rule the monthly rankings use; under that, the square gives the days measured. Each square opens that month's ranking with Beroun marked; each year, the year's.
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

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
MonthWhy
Oct 20265 of 12 days measured; a month needs 9. The others: 6 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.
Sep 20261 of 30 days measured; a month needs 21. The others: 29 with readings for part of the day (a day needs 18 hours).
Aug 2026No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jul 2026No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jun 20264 of 30 days measured; a month needs 21. The others: 26 with under 18 hours of readings or readings that failed our checks.
May 20269 of 31 days measured; a month needs 22. The others: 22 with under 18 hours of readings or readings that failed our checks.
Apr 20264 of 30 days measured; a month needs 21. The others: 26 with under 18 hours of readings or readings that failed our checks.
Mar 20262 of 31 days measured; a month needs 22. The others: 29 with under 18 hours of readings or readings that failed our checks.
Feb 20262 of 28 days measured; a month needs 20. The others: 26 with under 18 hours of readings or readings that failed our checks.
Jan 20269 of 31 days measured; a month needs 22. The others: 22 with under 18 hours of readings or readings that failed our checks.
Dec 202511 of 31 days measured; a month needs 22. The others: 20 with under 18 hours of readings or readings that failed our checks.
Nov 20259 of 30 days measured; a month needs 21. The others: 21 with under 18 hours of readings or readings that failed our checks.
Oct 20258 of 31 days measured; a month needs 22. The others: 23 with under 18 hours of readings or readings that failed our checks.
Sep 202518 of 30 days measured; a month needs 21. The others: 12 with under 18 hours of readings or readings that failed our checks.
Aug 202516 of 31 days measured; a month needs 22. The others: 15 with under 18 hours of readings or readings that failed our checks.
Jul 20257 of 31 days measured; a month needs 22. The others: 24 with under 18 hours of readings or readings that failed our checks.
Jun 20251 of 30 days measured; a month needs 21. The others: 29 with under 18 hours of readings or readings that failed our checks.
May 202511 of 31 days measured; a month needs 22. The others: 20 with under 18 hours of readings or readings that failed our checks.
Apr 202513 of 30 days measured; a month needs 21. The others: 17 with under 18 hours of readings or readings that failed our checks.
Mar 202510 of 31 days measured; a month needs 22. The others: 21 with under 18 hours of readings or readings that failed our checks.
Feb 202515 of 28 days measured; a month needs 20. The others: 13 with under 18 hours of readings or readings that failed our checks.
Jan 202514 of 31 days measured; a month needs 22. The others: 17 with under 18 hours of readings or readings that failed our checks.
Oct 20249 of 31 days measured; a month needs 22. The others: 22 with under 18 hours of readings or readings that failed our checks.
Sep 2024No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Aug 20241 of 31 days measured; a month needs 22. The others: 30 with under 18 hours of readings or readings that failed our checks.
Jun 2024No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Mar 202415 of 31 days measured; a month needs 22. The others: 16 with under 18 hours of readings or readings that failed our checks.
Nov 202319 of 30 days measured; a month needs 21. The others: 11 with under 18 hours of readings or readings that failed our checks.
Aug 202315 of 31 days measured; a month needs 22. The others: 16 with under 18 hours of readings or readings that failed our checks.
Jul 202321 of 31 days measured; a month needs 22. The others: 10 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.

Beroun's worst months

MonthUS AQIDays measuredWorld rankEpisode
January 2024 8426.6 µg/m³26 of 31153rdof 2,385Europe, 27 January to 2 February 2024
Europe, 8 to 27 January 2024
December 2023 7220.6 µg/m³23 of 31155thof 2,247Europe, December 2023
Eastern Europe, November and December 2023
February 2023 6918.7 µg/m³27 of 28164thof 1,129Europe, 28 February to 4 March 2023
Europe, 6 to 25 February 2023
November 2024 6818.4 µg/m³26 of 30273rdof 2,624Eastern Europe, 25 to 29 November 2024
Europe, November 2024
December 2024 6617.2 µg/m³24 of 31374thof 2,616Europe, 24 December 2024 to 3 January 2025
March 2023 6415.9 µg/m³27 of 3165thof 911Europe, 17 to 22 March 2023
Europe, 28 February to 4 March 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.

Beroun's worst days

DayUS AQIEpisode
11 Jan 2024 16373.3 µg/m³Europe, 8 to 27 January 2024
6 Dec 2023 15966.5 µg/m³Europe, December 2023
25 Jan 2026 15764.1 µg/m³Europe, January and February 2026
10 Jan 2024 15460.0 µg/m³Europe, 8 to 27 January 2024
29 Dec 2024 15256.8 µg/m³Europe, 24 December 2024 to 3 January 2025
9 Feb 2025 14352.7 µg/m³Europe, 1 to 14 February 2025
4 Feb 2025 14051.4 µg/m³Europe, 1 to 14 February 2025
10 Feb 2025 13951.0 µg/m³Europe, 1 to 14 February 2025
1 Jan 2023 13649.8 µg/m³Eastern Europe, January 2023
22 Feb 2025 13649.7 µg/m³Europe, 14 February to 1 March 2025

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, Beroun, Czechia, 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/cz/beroun/history (accessed 12 Oct 2026).

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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.

Beroun 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).