SmogRank / Spain / Valencia / Castelló de la Plana

Castelló de la Plana, month by month

Castelló de la Plana has a measured daily mean on 974 days since 1 January 2023. Its worst month was February 2025, at 53 US AQI (10.3 µg/m³), 1,160th of 2,633 cities on that month's world ranking. Its cleanest was June 2024, at 16 US AQI (2.8 µg/m³). 2025 averaged 39 US AQI (7.1 µg/m³), against 29 US AQI (5.3 µg/m³) in 2023.

Every month since 2023

2026too few days for a mean (a year needs 200)72 days measured
Jan32#2,199Feb8 daysMarnoneAprnoneMay1 dayJunnoneJulnoneAugnoneSep27#2,447Oct7 days
202539 for the year316 days measured2,057th of 2,681 in the world
Jan42#1,523Feb53#1,160Mar28#2,465Apr39#2,033May29#2,212Jun19 daysJul39#2,005Aug51#1,425Sep31#2,285Oct36#1,377Nov26#2,469Dec45#1,810
2024too few days for a mean (a year needs 257)250 days measured
Jan30#1,984Feb37#1,616Mar15 daysApr22#2,259May16#2,605Jun16#2,510Jul14 daysAug7 daysSepnoneOct15 daysNov46#1,296Dec39#1,706
202329 for the year336 days measured1,238th of 1,355 in the world
Jan18#1,217Feb34#1,005Mar27#809Apr53#442May26#1,455Jun28#1,414Jul47#817Aug24#1,885Sep19#2,136Oct22#1,918Nov19#2,174Dec28#2,003
Each square is a month's mean PM2.5 in US AQI from Castelló de la Plana'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 Castelló de la Plana 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

14 months
MonthWhy
Oct 20267 of 12 days measured; a month needs 9. The others: 2 with no readings from the monitors, 3 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 2026No day measured. The others: 30 with under 18 hours of readings or readings that failed our checks.
May 20261 of 31 days measured; a month needs 22. The others: 30 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.
Jun 202519 of 30 days measured; a month needs 21. The others: 11 with under 18 hours of readings or readings that failed our checks.
Oct 202415 of 31 days measured; a month needs 22. The others: 16 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 20247 of 31 days measured; a month needs 22. The others: 24 with under 18 hours of readings or readings that failed our checks.
Jul 202414 of 31 days measured; a month needs 22. The others: 17 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.

Castelló de la Plana's worst months

MonthUS AQIDays measuredWorld rank
February 2025 5310.3 µg/m³21 of 281,160thof 2,633
April 2023 5310.0 µg/m³29 of 30442ndof 1,622
August 2025 519.2 µg/m³31 of 311,425thof 2,901
July 2023 478.4 µg/m³28 of 31817thof 1,432
November 2024 468.2 µg/m³26 of 301,296thof 2,624
December 2025 458.1 µg/m³29 of 311,810thof 3,006

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.

Castelló de la Plana's worst days

DayUS AQI
18 Jul 2023 7320.8 µg/m³
1 Jun 2023 7220.5 µg/m³
12 Jul 2023 7119.7 µg/m³
19 Jul 2023 7119.6 µg/m³
14 Jan 2026 7019.2 µg/m³
30 Oct 2024 6918.9 µg/m³
29 Nov 2024 6918.8 µg/m³
12 Apr 2023 6818.4 µg/m³
9 Dec 2025 6818.4 µg/m³
7 Feb 2025 6818.3 µg/m³

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, Castelló de la Plana, Spain, 1 Jan 2023 – 9 Oct 2026. Monitor data from EEA, via OpenAQ and from the publisher directly; sources listed at smogrank.com/sources. smogrank.com/es/castello-de-la-plana/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.

Castelló de la Plana now: the last 24 hours, its ranks today and the last 12 months day by day.

Updated 2026-10-13 02:07 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).