SmogRank / Czechia / Liberec Region / Chrastava

Chrastava, month by month

Chrastava has a measured daily mean on 316 days since 29 January 2024. Its worst month was February 2024, at 46 US AQI (8.3 µg/m³), 1,020th of 2,486 cities on that month's world ranking. Its cleanest was July 2024, at 31 US AQI (5.6 µg/m³).

Every month since 2024

2026too few days for a mean (a year needs 200)32 days measured
Jan6 daysFebnoneMar3 daysApr3 daysMay11 daysJun3 daysJulnoneAugnoneSep1 dayOct5 days
2025too few days for a mean (a year needs 256)120 days measured
Jan7 daysFeb10 daysMar11 daysApr16 daysMay12 daysJun1 dayJul7 daysAug16 daysSep17 daysOct6 daysNov11 daysDec6 days
2024too few days for a mean (a year needs 257)164 days measured
Jan3 daysFeb46#1,020Mar14 daysApr33#1,678May33#2,012JunnoneJul31#2,097Aug1 daySepnoneOct9 daysNov11 daysDec14 days
Each square is a month's mean PM2.5 in US AQI from Chrastava'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 Chrastava 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: 3 with no readings from the monitor, 3 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 under 18 hours of readings or readings that failed our checks.
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 202611 of 31 days measured; a month needs 22. The others: 20 with under 18 hours of readings or readings that failed our checks.
Apr 20263 of 30 days measured; a month needs 21. The others: 27 with under 18 hours of readings or readings that failed our checks.
Mar 20263 of 31 days measured; a month needs 22. The others: 28 with under 18 hours of readings or readings that failed our checks.
Feb 2026No day measured. The others: 28 with under 18 hours of readings or readings that failed our checks.
Jan 20266 of 31 days measured; a month needs 22. The others: 25 with under 18 hours of readings or readings that failed our checks.
Dec 20256 of 31 days measured; a month needs 22. The others: 25 with under 18 hours of readings or readings that failed our checks.
Nov 202511 of 30 days measured; a month needs 21. The others: 19 with under 18 hours of readings or readings that failed our checks.
Oct 20256 of 31 days measured; a month needs 22. The others: 25 with under 18 hours of readings or readings that failed our checks.
Sep 202517 of 30 days measured; a month needs 21. The others: 13 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 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 202511 of 31 days measured; a month needs 22. The others: 20 with under 18 hours of readings or readings that failed our checks.
Feb 202510 of 28 days measured; a month needs 20. The others: 18 with under 18 hours of readings or readings that failed our checks.
Jan 20257 of 31 days measured; a month needs 22. The others: 24 with under 18 hours of readings or readings that failed our checks.
Dec 202414 of 31 days measured; a month needs 22. The others: 17 with under 18 hours of readings or readings that failed our checks.
Nov 202411 of 30 days measured; a month needs 21. The others: 19 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 202414 of 31 days measured; a month needs 22. The others: 17 with under 18 hours of readings or readings that failed our checks.
Jan 20243 of 31 days measured; a month needs 22.

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

Chrastava's worst months

MonthUS AQIDays measuredWorld rankEpisode
February 2024 468.3 µg/m³28 of 291,020thof 2,486Europe, February and March 2024
Europe, 27 January to 2 February 2024
April 2024 336.0 µg/m³28 of 301,678thof 2,520Europe, March and April 2024
May 2024 336.0 µg/m³30 of 312,012thof 2,684–
July 2024 315.6 µg/m³26 of 312,097thof 2,566–

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.

Chrastava's worst days

DayUS AQIEpisode
24 Jan 2026 17590.2 µg/m³Europe, January and February 2026
25 Jan 2026 15561.4 µg/m³Europe, January and February 2026
23 Jan 2026 14653.6 µg/m³Europe, January and February 2026
31 Mar 2024 10938.6 µg/m³Europe, March and April 2024
11 Nov 2024 10235.9 µg/m³Europe, November 2024
24 Mar 2025 9532.8 µg/m³Europe, March 2025
6 Mar 2024 9331.6 µg/m³Europe, February and March 2024
14 Feb 2025 9231.3 µg/m³Europe, 14 February to 1 March 2025
Europe, 1 to 14 February 2025
30 Mar 2024 9230.9 µg/m³Europe, March and April 2024
7 Nov 2024 9130.5 µg/m³Europe, November 2024

Daily means, the highest since 29 Jan 2024; 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, Chrastava, Czechia, 29 Jan 2024 – 12 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/cz/chrastava/history (accessed 13 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.

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

Updated 2026-10-13 00:07 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).