SmogRank / Episodes / Spain

Basque Country and Castille and León, Spain, June 2025

For 1 day, on 10 June 2025, 9 cities in Spain had PM2.5 at least twice their usual for the time of year. The worst reading was Beasain, Basque Country, Spain: 33.4 µg/m³ on 10 June, about 3.1× its usual 10.8. Ended 10 June.

Few fires were detected near these cities on those days. Spreads like this usually come from still weather trapping smoke from heating, traffic and industry, or from dust.
Cities reached9in 1 country
Days110 June 2025
Worst day10 June9 cities counted
Furthest above usual3.7×Oria

Day by day

10 June 9 cities at twice their usual or more
Miranda de EbroLogroñoSoriaBurgosGasteiz / VitoriaAranda de DueroZumarragaAzpeitiaBermeoTudelaZarautzPalenciaPamplonaHernaniDonostia / San SebastiánAlgeteAlcalá de HenaresTorrejón de ArdozCosladaCollado-VillalbaMadridVillarejo de SalvanésMóstolesFuenlabradaValdemoroMedina del CampoVilla del PradoLeónSalamancaPauSamaGijónMont-de-MarsanOviedoAvilésPonferradaCastelló de la PlanaLleidaSaguntoBenicàssimSalouConstantíTarragonaSarriales EscaldesBurela de CaboLugoXinzo de LimiaVila RealVilanova i la GeltrúOurenseGuitirizAs Pontes de García RodríguezZallaDurangoBilbaoLaudio / LlodioAmorebietaBeasainGetxoSan IldefonsoOria
7 Jun8910111213
Every measured city in the area, coloured by its PM2.5 that day; a dark ring marks a city at twice its usual or more. Bars: cities counted each day, coloured by their median level. Choose a day or press play; without JavaScript, the days link to that day's world ranking.

How it spread

BeasainBeasain, 7 June: no readingBeasain, 8 June: no readingBeasain, 9 June: no readingBeasain, 10 June: 33.4 µg/m³, 3.1× its usual 10.8Beasain, 11 June: 19.2 µg/m³Beasain, 12 June: 10.9 µg/m³Beasain, 13 June: no readingLaudio / LlodioLaudio / Llodio, 7 June: no readingLaudio / Llodio, 8 June: no readingLaudio / Llodio, 9 June: no readingLaudio / Llodio, 10 June: 30.7 µg/m³, 3.0× its usual 10.4Laudio / Llodio, 11 June: 16.0 µg/m³Laudio / Llodio, 12 June: no readingLaudio / Llodio, 13 June: no readingOriaOria, 7 June: no readingOria, 8 June: no readingOria, 9 June: no readingOria, 10 June: 29.8 µg/m³, 3.7× its usual 8.0Oria, 11 June: 25.6 µg/m³Oria, 12 June: 12.4 µg/m³Oria, 13 June: no readingBilbaoBilbao, 7 June: no readingBilbao, 8 June: no readingBilbao, 9 June: no readingBilbao, 10 June: 29.3 µg/m³, 2.9× its usual 10.0Bilbao, 11 June: 19.6 µg/m³Bilbao, 12 June: 19.6 µg/m³Bilbao, 13 June: no readingDurangoDurango, 7 June: no readingDurango, 8 June: no readingDurango, 9 June: no readingDurango, 10 June: 29.2 µg/m³, 2.8× its usual 10.5Durango, 11 June: 16.4 µg/m³Durango, 12 June: no readingDurango, 13 June: no readingSan IldefonsoSan Ildefonso, 7 June: no readingSan Ildefonso, 8 June: no readingSan Ildefonso, 9 June: no readingSan Ildefonso, 10 June: 28.2 µg/m³, 3.5× its usual 8.1San Ildefonso, 11 June: 19.3 µg/m³San Ildefonso, 12 June: 18.3 µg/m³San Ildefonso, 13 June: no readingAmorebietaAmorebieta, 7 June: no readingAmorebieta, 8 June: no readingAmorebieta, 9 June: no readingAmorebieta, 10 June: 27.0 µg/m³, 3.1× its usual 8.8Amorebieta, 11 June: 20.2 µg/m³Amorebieta, 12 June: 16.4 µg/m³Amorebieta, 13 June: no readingGetxoGetxo, 7 June: no readingGetxo, 8 June: no readingGetxo, 9 June: no readingGetxo, 10 June: 26.6 µg/m³, 3.3× its usual 8.0Getxo, 11 June: 21.4 µg/m³Getxo, 12 June: 18.9 µg/m³Getxo, 13 June: no readingZallaZalla, 7 June: no readingZalla, 8 June: no readingZalla, 9 June: no readingZalla, 10 June: 25.0 µg/m³, 2.6× its usual 9.8Zalla, 11 June: 11.8 µg/m³Zalla, 12 June: no readingZalla, 13 June: no reading7 Jun8910111213
Every counted city, in the order the episode reached them, 3 days before to 3 after. Each square is a day, coloured by that day's PM2.5; outlined: at twice the city's usual or more.
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

Every city it reached

CityDaysHighestUsualAbove usual
OriaBasque Country, Spain1 29.810 June8.03.7×
San IldefonsoCastille and León, Spain1 28.210 June8.13.5×
GetxoBasque Country, Spain1 26.610 June8.03.3×
BeasainBasque Country, Spain1 33.410 June10.83.1×
AmorebietaBasque Country, Spain1 27.010 June8.83.1×
Laudio / LlodioBasque Country, Spain1 30.710 June10.43.0×
BilbaoBasque Country, Spain1 29.310 June10.02.9×
DurangoBasque Country, Spain1 29.210 June10.52.8×
ZallaBasque Country, Spain1 25.010 June9.82.6×

Daily means in µg/m³, over the days each city counted in this episode. Highest: its highest of those days. Usual: the city's median for the time of year of that day (its days within 21 days of the date, every year, leaving out the week around it). Above usual: its highest day against that, with a usual under 5 µg/m³ taken as 5.

Against other episodes in Spain

Number 31 of 41 episodes in Spain since our records began, by cities reached.

Bars: cities reached; colour: the level of the episode's highest daily reading. All 41.

Use this page

SmogRank, Basque Country and Castille and León, Spain, June 2025: 9 cities with PM2.5 at twice their usual or more, 10 June 2025, smogrank.com/episodes/2025-06-basque-country-and-castille-and-leon-spain (accessed 5 October 2026).

Download top 10 (PNG)

You're welcome to reuse a single chart, image or figure with this citation and a link. Terms.

An episode is a run of days when many cities close to each other (four or more within 350 km on a day, 8 or more in all) each had a daily PM2.5 mean of at least 25 µg/m³ and at least 2 times their usual for that time of year. Found in our own measurements, not picked by hand. How we find episodes. Values are each city's daily mean of its own monitors; causes are the usual kinds for a pattern like this, not a confirmed source. Fire detections from NASA FIRMS; smoke maps from NOAA HMS.