SmogRank / Croatia / Primorje-Gorski Kotar / Rijeka

Rijeka, month by month

Rijeka has a measured daily mean on 265 days since 2 February 2023. Its worst month was December 2023, at 53 US AQI (10.1 µg/m³), 672nd of 2,247 cities on that month's world ranking. Its cleanest was May 2024, at 33 US AQI (5.9 µg/m³).

Every month since 2023

2026too few days for a mean (a year needs 200)10 days measured
Jan1 dayFebnoneMarnoneAprnoneMay2 daysJun2 daysJulnoneAugnoneSep1 dayOct4 days
2025too few days for a mean (a year needs 256)36 days measured
Jan11 daysFeb18 daysMar7 daysAprnoneMaynoneJunnoneJulnoneAugnoneSepnoneOctnoneNovnoneDecnone
2024too few days for a mean (a year needs 257)125 days measured
Jan49#1,053Feb15 daysMarnoneApr19 daysMay33#2,043JunnoneJulnoneAugnoneSepnoneOctnoneNov52#890Dec17 days
2023too few days for a mean (a year needs 256)94 days measured
JanFeb19 daysMar17 daysApr3 daysMaynoneJunnoneJul1 dayAugnoneSepnoneOct6 daysNov19 daysDec53#672
Each square is a month's mean PM2.5 in US AQI from Rijeka'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 Rijeka 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

41 months
MonthWhy
Oct 20264 of 12 days measured; a month needs 9. The others: 7 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 20262 of 30 days measured; a month needs 21. The others: 28 with under 18 hours of readings or readings that failed our checks.
May 20262 of 31 days measured; a month needs 22. The others: 29 with under 18 hours of readings or readings that failed our checks.
Apr 2026No day measured. The others: 30 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 2026No day measured. The others: 28 with under 18 hours of readings or readings that failed our checks.
Jan 20261 of 31 days measured; a month needs 22. The others: 30 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 2025No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Oct 2025No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Sep 2025No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Aug 2025No day measured. The others: 31 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 2025No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
May 2025No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Apr 2025No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Mar 20257 of 31 days measured; a month needs 22. The others: 24 with under 18 hours of readings or readings that failed our checks.
Feb 202518 of 28 days measured; a month needs 20. The others: 10 with under 18 hours of readings or readings that failed our checks.
Jan 202511 of 31 days measured; a month needs 22. The others: 20 with under 18 hours of readings or readings that failed our checks.
Dec 202417 of 31 days measured; a month needs 22. The others: 14 with under 18 hours of readings or readings that failed our checks.
Oct 2024No day measured. The others: 31 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 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jul 2024No day measured. The others: 31 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.
Apr 202419 of 30 days measured; a month needs 21. The others: 11 with under 18 hours of readings or readings that failed our checks.
Mar 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Feb 202415 of 29 days measured; a month needs 21. The others: 14 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.
Oct 20236 of 31 days measured; a month needs 22. The others: 25 with under 18 hours of readings or readings that failed our checks.
Sep 2023No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
Aug 2023No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Jul 20231 of 31 days measured; a month needs 22. The others: 30 with under 18 hours of readings or readings that failed our checks.
Jun 2023No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
May 2023No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Apr 20233 of 30 days measured; a month needs 21. The others: 27 with under 18 hours of readings or readings that failed our checks.
Mar 202317 of 31 days measured; a month needs 22. The others: 3 missing from OpenAQ's archive, 11 with under 18 hours of readings or readings that failed our checks.
Feb 202319 of 28 days measured; a month needs 20. The others: 6 missing from OpenAQ's archive, 2 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.

Rijeka's worst months

MonthUS AQIDays measuredWorld rank
December 2023 5310.1 µg/m³29 of 31672ndof 2,247
November 2024 529.8 µg/m³21 of 30890thof 2,624
January 2024 498.8 µg/m³29 of 311,053rdof 2,385
May 2024 335.9 µg/m³24 of 312,043rdof 2,684

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.

Rijeka's worst days

DayUS AQIEpisode
2 Feb 2023 13248.2 µg/m³–
18 Feb 2023 10637.4 µg/m³Europe, 6 to 25 February 2023
17 Feb 2023 8929.4 µg/m³Europe, 6 to 25 February 2023
6 Feb 2024 8326.2 µg/m³Southern Europe, February 2024
11 Feb 2025 8125.3 µg/m³Europe, 1 to 14 February 2025
29 Dec 2023 7823.7 µg/m³–
5 Feb 2024 7823.7 µg/m³Southern Europe, February 2024
22 Feb 2025 7722.9 µg/m³–
21 Feb 2023 7622.6 µg/m³Europe, 6 to 25 February 2023
7 Feb 2024 7622.3 µg/m³Southern Europe, February 2024

Daily means, the highest since 2 Feb 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, Rijeka, Croatia, 2 Feb 2023 – 11 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/hr/rijeka/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.

Rijeka 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).