SmogRank / Czechia / South Moravian / Znojmo

Znojmo, month by month

Znojmo has a measured daily mean on 789 days since 1 January 2023. Its worst month was January 2024, at 71 US AQI (20.0 µg/m³), 272nd of 2,385 cities on that month's world ranking. Its cleanest was May 2024, at 47 US AQI (8.4 µg/m³).

Every month since 2023

2026too few days for a mean (a year needs 199)62 days measured
Jan10 daysFeb7 daysMar5 daysApr11 daysMay18 daysJun5 daysJulnoneAugnoneSep1 dayOct5 days
2025too few days for a mean (a year needs 256)177 days measured
Jan14 daysFeb19 daysMar13 daysApr16 daysMay12 daysJun3 daysJul9 daysAug56#823Sep19 daysOct10 daysNov16 daysDec21 days
2024too few days for a mean (a year needs 257)219 days measured
Jan71#272Feb55#512Mar15 daysApr47#1,233May47#1,163JunnoneJul52#832Aug1 daySepnoneOct9 daysNov69#261Dec69#306
202357 for the year331 days measured188th of 1,355 in the world
Jan62#252Feb62#361Mar61#90Apr59#196May54#358Jun54#686Jul51#729Aug53#623Sep57#314Oct55#233Nov53#557Dec67#200
Each square is a month's mean PM2.5 in US AQI from Znojmo'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 Znojmo 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

26 months
MonthWhy
Oct 20265 of 11 days measured; a month needs 8. The others: 6 with readings for part of the day (a day needs 18 hours).
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 20265 of 30 days measured; a month needs 21. The others: 25 with under 18 hours of readings or readings that failed our checks.
May 202618 of 31 days measured; a month needs 22. The others: 13 with under 18 hours of readings or readings that failed our checks.
Apr 202611 of 30 days measured; a month needs 21. The others: 19 with under 18 hours of readings or readings that failed our checks.
Mar 20265 of 31 days measured; a month needs 22. The others: 26 with under 18 hours of readings or readings that failed our checks.
Feb 20267 of 28 days measured; a month needs 20. The others: 21 with under 18 hours of readings or readings that failed our checks.
Jan 202610 of 31 days measured; a month needs 22. The others: 21 with under 18 hours of readings or readings that failed our checks.
Dec 202521 of 31 days measured; a month needs 22. The others: 10 with under 18 hours of readings or readings that failed our checks.
Nov 202516 of 30 days measured; a month needs 21. The others: 14 with under 18 hours of readings or readings that failed our checks.
Oct 202510 of 31 days measured; a month needs 22. The others: 21 with under 18 hours of readings or readings that failed our checks.
Sep 202519 of 30 days measured; a month needs 21. The others: 11 with under 18 hours of readings or readings that failed our checks.
Jul 20259 of 31 days measured; a month needs 22. The others: 22 with under 18 hours of readings or readings that failed our checks.
Jun 20253 of 30 days measured; a month needs 21. The others: 27 with under 18 hours of readings or readings that failed our checks.
May 202512 of 31 days measured; a month needs 22. The others: 19 with under 18 hours of readings or readings that failed our checks.
Apr 202516 of 30 days measured; a month needs 21. The others: 14 with under 18 hours of readings or readings that failed our checks.
Mar 202513 of 31 days measured; a month needs 22. The others: 18 with under 18 hours of readings or readings that failed our checks.
Feb 202519 of 28 days measured; a month needs 20. The others: 9 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.

A day counts once 18 hours of it are measured; a month needs 70% of its days.

Znojmo's worst months

MonthUS AQIDays measuredWorld rankEpisode
January 2024 7120.0 µg/m³29 of 31272ndof 2,385Europe, 27 January to 2 February 2024
Europe, 8 to 27 January 2024
December 2024 6918.9 µg/m³24 of 31306thof 2,616Europe, 24 December 2024 to 3 January 2025
Serbia, Slovenia and 10 more countries, December 2024
November 2024 6918.6 µg/m³27 of 30261stof 2,624Europe, November 2024
Eastern Europe, October and November 2024
December 2023 6717.9 µg/m³24 of 31200thof 2,247Czechia, Slovakia and 2 more countries, December 2023
Europe, December 2023and 1 more
January 2023 6214.8 µg/m³27 of 31252ndof 1,261Eastern Europe, January 2023
February 2023 6214.8 µg/m³26 of 28361stof 1,129Europe, 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.

Znojmo's worst days

DayUS AQIEpisode
1 Jan 2023 16676.9 µg/m³Eastern Europe, January 2023
15 Jan 2026 15459.6 µg/m³Europe, January and February 2026
24 Jan 2026 15256.8 µg/m³Europe, January and February 2026
6 Dec 2023 14051.4 µg/m³Europe, December 2023
23 Jan 2026 13549.5 µg/m³Europe, January and February 2026
8 Nov 2024 13448.8 µg/m³Europe, November 2024
10 Jan 2024 12846.4 µg/m³Europe, 8 to 27 January 2024
19 Mar 2023 12745.9 µg/m³Europe, 17 to 22 March 2023
22 Jan 2026 12545.1 µg/m³Europe, January and February 2026
29 Dec 2024 12244.2 µg/m³Europe, 24 December 2024 to 3 January 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, Znojmo, 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/znojmo/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.

Znojmo now: the last 24 hours, its ranks today and the last 12 months day by day.

Updated 2026-10-12 20:07 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).