SmogRank / Spain / La Rioja / Logroño

Logroño, month by month

Logroño has a measured daily mean on 297 days since 1 February 2024. Its worst month was November 2025, at 71 US AQI (19.9 µg/m³), 412th of 2,715 cities on that month's world ranking. Its cleanest was April 2025, at 48 US AQI (8.6 µg/m³).

Every month since 2024

2026too few days for a mean (a year needs 199)32 days measured
Jan15 daysFeb8 daysMarnoneAprnoneMaynoneJun3 daysJulnoneAugnoneSep5 daysOct1 day
202560 for the year264 days measured484th of 2,681 in the world
Jan18 daysFeb15 daysMar51#1,735Apr48#1,598May61#440Jun16 daysJul57#731Aug61#384Sep57#458Oct21 daysNov71#412Dec17 days
2024too few days for a mean (a year needs 257)1 day measured
JanFeb1 dayMarnoneAprnoneMaynoneJunnoneJulnoneAugnoneSepnoneOctnoneNovnoneDecnone
Each square is a month's mean PM2.5 in US AQI from Logroño'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 Logroño 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 20261 of 11 days measured; a month needs 8. The others: 2 with no readings from the monitors, 8 with readings for part of the day (a day needs 18 hours).
Sep 20265 of 30 days measured; a month needs 21. The others: 3 with no readings from the monitors, 22 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 2026No day measured. The others: 31 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 20268 of 28 days measured; a month needs 20. The others: 20 with under 18 hours of readings or readings that failed our checks.
Jan 202615 of 31 days measured; a month needs 22. The others: 16 with under 18 hours of readings or readings that failed our checks.
Dec 202517 of 31 days measured; a month needs 22. The others: 14 with under 18 hours of readings or readings that failed our checks.
Oct 202521 of 31 days measured; a month needs 22. The others: 10 with under 18 hours of readings or readings that failed our checks.
Jun 202516 of 30 days measured; a month needs 21. The others: 14 with under 18 hours of readings or readings that failed our checks.
Feb 202515 of 28 days measured; a month needs 20. The others: 13 with under 18 hours of readings or readings that failed our checks.
Jan 202518 of 31 days measured; a month needs 22. The others: 13 with under 18 hours of readings or readings that failed our checks.
Dec 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Nov 2024No day measured. The others: 30 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.
May 2024No day measured. The others: 31 with under 18 hours of readings or readings that failed our checks.
Apr 2024No day measured. The others: 30 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 20241 of 29 days measured; a month needs 21. The others: 28 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.

Logroño's worst months

MonthUS AQIDays measuredWorld rank
November 2025 7119.9 µg/m³23 of 30412thof 2,715
August 2025 6114.7 µg/m³31 of 31384thof 2,901
May 2025 6114.2 µg/m³22 of 31440thof 2,826
July 2025 5712.5 µg/m³26 of 31731stof 2,889
September 2025 5712.1 µg/m³25 of 30458thof 3,104
March 2025 519.2 µg/m³25 of 311,735thof 2,862

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.

Logroño's worst days

DayUS AQI
5 Nov 2025 195118.0 µg/m³
19 Nov 2025 195118.0 µg/m³
16 Dec 2025 193115.5 µg/m³
8 Sept 2025 189110.0 µg/m³
8 May 2025 184103.0 µg/m³
22 Aug 2025 184102.5 µg/m³
21 Jan 2026 17894.7 µg/m³
8 Oct 2025 15561.6 µg/m³
20 Nov 2025 15257.2 µg/m³
21 Jul 2025 15256.4 µg/m³

Daily means, the highest since 1 Feb 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, Logroño, Spain, 1 Feb 2024 – 6 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/es/logrono/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.

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

Updated 2026-10-12 18:07 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).