SmogRank / Czechia / Ústí nad Labem Region / Děčín

Děčín, month by month

Děčín has a measured daily mean on 664 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 July 2024, at 52 US AQI (9.6 µg/m³).

Every month since 2023

2026too few days for a mean (a year needs 199)27 days measured
Jan8 daysFeb2 daysMar1 dayApr1 dayMay6 daysJun3 daysJulnoneAugnoneSep1 dayOct5 days
2025too few days for a mean (a year needs 256)87 days measured
Jan15 daysFeb17 daysMar9 daysApr10 daysMay10 daysJun1 dayJul1 dayAug5 daysSep9 daysOct5 daysNov3 daysDec2 days
2024too few days for a mean (a year needs 257)219 days measured
Jan84#153Feb65#292Mar15 daysApr57#653May53#755Jun1 dayJul52#832Aug1 daySepnoneOct8 daysNov73#187Dec64#408
202364 for the year331 days measured103rd of 1,355 in the world
Jan68#183Feb74#99Mar68#40Apr64#152May60#166Jun59#473Jul54#585Aug20 daysSep61#195Oct63#110Nov61#162Dec80#99
Each square is a month's mean PM2.5 in US AQI from Děčín'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 Děčín 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

28 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 20263 of 30 days measured; a month needs 21. The others: 27 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 20261 of 30 days measured; a month needs 21. The others: 29 with under 18 hours of readings or readings that failed our checks.
Mar 20261 of 31 days measured; a month needs 22. The others: 30 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 20252 of 31 days measured; a month needs 22. The others: 29 with under 18 hours of readings or readings that failed our checks.
Nov 20253 of 30 days measured; a month needs 21. The others: 27 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 20259 of 30 days measured; a month needs 21. The others: 21 with under 18 hours of readings or readings that failed our checks.
Aug 20255 of 31 days measured; a month needs 22. The others: 26 with under 18 hours of readings or readings that failed our checks.
Jul 20251 of 31 days measured; a month needs 22. The others: 30 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 202510 of 31 days measured; a month needs 22. The others: 21 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 20259 of 31 days measured; a month needs 22. The others: 22 with under 18 hours of readings or readings that failed our checks.
Feb 202517 of 28 days measured; a month needs 20. The others: 11 with under 18 hours of readings or readings that failed our checks.
Jan 202515 of 31 days measured; a month needs 22. The others: 16 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.
Aug 202320 of 31 days measured; a month needs 22. The others: 11 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.

Děčín's worst months

MonthUS AQIDays measuredWorld rankEpisode
January 2024 8426.6 µg/m³30 of 31153rdof 2,385Europe, 27 January to 2 February 2024
Europe, 8 to 27 January 2024
December 2023 8024.8 µg/m³24 of 3199thof 2,247Europe, December 2023
Eastern Europe, November and December 2023
February 2023 7421.5 µg/m³27 of 2899thof 1,129Europe, 28 February to 4 March 2023
Europe, 6 to 25 February 2023
November 2024 7321.0 µg/m³26 of 30187thof 2,624Eastern Europe, 25 to 29 November 2024
Europe, November 2024
March 2023 6818.3 µg/m³29 of 3140thof 911Europe, 17 to 22 March 2023
Europe, 28 February to 4 March 2023
January 2023 6818.0 µg/m³26 of 31183rdof 1,261–

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.

Děčín's worst days

DayUS AQIEpisode
10 Nov 2024 16372.0 µg/m³Europe, November 2024
7 Dec 2023 16068.7 µg/m³Europe, December 2023
25 Jan 2026 15967.2 µg/m³Europe, January and February 2026
10 Jan 2024 15460.0 µg/m³Europe, 8 to 27 January 2024
10 Feb 2025 15358.7 µg/m³Europe, 1 to 14 February 2025
11 Jan 2024 15257.6 µg/m³Europe, 8 to 27 January 2024
21 Jan 2024 15256.5 µg/m³Europe, 8 to 27 January 2024
31 Mar 2024 14854.6 µg/m³Europe, March and April 2024
31 Jan 2024 14854.5 µg/m³Europe, 27 January to 2 February 2024
4 Feb 2025 14653.9 µg/m³Europe, 1 to 14 February 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, Děčín, 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/decin/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.

Děčín 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).