SmogRank / Czechia / Ústí nad Labem Region / Ústí nad Labem

Ústí nad Labem, month by month

Ústí nad Labem has a measured daily mean on 670 days since 1 January 2023. Its worst month was November 2024, at 70 US AQI (19.3 µg/m³), 244th of 2,624 cities on that month's world ranking. Its cleanest was July 2023, at 44 US AQI (7.9 µg/m³).

Every month since 2023

2026too few days for a mean (a year needs 200)29 days measured
Jan8 daysFeb2 daysMarnoneApr2 daysMay6 daysJun4 daysJulnoneAugnoneSep1 dayOct6 days
2025too few days for a mean (a year needs 256)72 days measured
Jan14 daysFeb16 daysMar8 daysApr10 daysMay7 daysJun1 dayJulnoneAug3 daysSep7 daysOct5 daysNov1 dayDecnone
2024too few days for a mean (a year needs 257)220 days measured
Jan70#301Feb58#424Mar15 daysApr44#1,307May49#1,022Jun1 dayJul46#1,275Aug1 daySepnoneOct8 daysNov70#244Dec59#551
202356 for the year349 days measured237th of 1,355 in the world
Jan58#313Feb65#248Mar59#118Apr54#327May53#470Jun55#648Jul44#867Aug47#911Sep54#491Oct55#206Nov52#643Dec69#180
Each square is a month's mean PM2.5 in US AQI from Ústí nad Labem'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 Ústí nad Labem 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

27 months
MonthWhy
Oct 20266 of 12 days measured; a month needs 9. 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 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 20266 of 31 days measured; a month needs 22. The others: 25 with under 18 hours of readings or readings that failed our checks.
Apr 20262 of 30 days measured; a month needs 21. The others: 28 with under 18 hours of readings or readings that failed our checks.
Mar 2026No day measured. The others: 31 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 20268 of 31 days measured; a month needs 22. The others: 23 with under 18 hours of readings or readings that failed our checks.
Dec 2025No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Nov 20251 of 30 days measured; a month needs 21. The others: 29 with under 18 hours of readings or readings that failed our checks.
Oct 20255 of 31 days measured; a month needs 22. The others: 26 with under 18 hours of readings or readings that failed our checks.
Sep 20257 of 30 days measured; a month needs 21. The others: 23 with under 18 hours of readings or readings that failed our checks.
Aug 20253 of 31 days measured; a month needs 22. The others: 28 with under 18 hours of readings or readings that failed our checks.
Jul 2025No day measured. The others: 31 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 20257 of 31 days measured; a month needs 22. The others: 24 with under 18 hours of readings or readings that failed our checks.
Apr 202510 of 30 days measured; a month needs 21. The others: 20 with under 18 hours of readings or readings that failed our checks.
Mar 20258 of 31 days measured; a month needs 22. The others: 23 with under 18 hours of readings or readings that failed our checks.
Feb 202516 of 28 days measured; a month needs 20. The others: 12 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 20248 of 31 days measured; a month needs 22. The others: 23 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 20241 of 30 days measured; a month needs 21. The others: 29 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.

Ústí nad Labem's worst months

MonthUS AQIDays measuredWorld rankEpisode
November 2024 7019.3 µg/m³27 of 30244thof 2,624Eastern Europe, 25 to 29 November 2024
Europe, November 2024
January 2024 7019.2 µg/m³30 of 31301stof 2,385Europe, 27 January to 2 February 2024
Europe, 8 to 27 January 2024and 1 more
December 2023 6918.9 µg/m³26 of 31180thof 2,247Europe, December 2023
Eastern Europe, November and December 2023
February 2023 6516.7 µg/m³28 of 28248thof 1,129Europe, 6 to 25 February 2023
December 2024 5913.6 µg/m³24 of 31551stof 2,616Europe, 24 December 2024 to 3 January 2025
March 2023 5913.3 µg/m³30 of 31118thof 911Europe, 17 to 22 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.

Ústí nad Labem's worst days

DayUS AQIEpisode
10 Nov 2024 16068.9 µg/m³Europe, November 2024
7 Dec 2023 14754.0 µg/m³Europe, December 2023
4 Feb 2025 13750.1 µg/m³Europe, 1 to 14 February 2025
6 Dec 2023 12846.5 µg/m³Europe, December 2023
9 Nov 2024 12746.0 µg/m³Europe, November 2024
8 Nov 2024 12545.3 µg/m³Europe, November 2024
23 Jan 2026 12444.7 µg/m³Europe, January and February 2026
24 Jan 2026 12344.4 µg/m³Europe, January and February 2026
25 Jan 2026 12243.9 µg/m³Europe, January and February 2026
1 Mar 2024 12043.4 µg/m³Europe, February and March 2024

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, Ústí nad Labem, Czechia, 1 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/usti-nad-labem/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.

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

Updated 2026-10-12 23:07 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).