SmogRank / Episodes / Spain
Northern Spain, October 2024
For 2 days, from 30 to 31 October 2024, 23 cities in Spain had PM2.5 at least twice their usual for the time of year. The worst reading was Alcalá de Henares, Madrid, Spain: 47.8 µg/m³ on 31 October, about 6.8× its usual 7.0.
No cause named We have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached 23 in 1 country
Days 2 30 to 31 October 2024
Worst day 31 October 20 cities counted
Furthest above usual 7.4× Madrid
Day by day
Play 31 October 20 cities at twice their usual or more
Toledo Ciudad Real Salamanca Palencia Bailén Córdoba Burgos Jaén Granada Sevilla Gasteiz / Vitoria Vila Real Tudela Huelva Zaragoza Elda Ourense Onda Lugo Sagunto Torrevieja Alicante Burriana Ponte de Lima Castelló de la Plana Lalín Benicàssim Pontevedra Santiago de Compostela Lleida Xàtiva Vigo Collado-Villalba Murcia Cartagena Valdemoro Cuenca Valencia Molina de Segura León Grao de Murviedro Lorca Villena Fuenlabrada Valladolid Barrio de Peral Torrejón de Ardoz Medina del Campo Coslada Alcalá de Henares Algete Móstoles Madrid 27 Oct 28 29 30 31 1 Nov 2 3 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
Cuenca Cuenca, 27 October: 4.2 µg/m³ Cuenca, 28 October: 5.0 µg/m³ Cuenca, 29 October: no reading Cuenca, 30 October: 44.4 µg/m³, 4.4× its usual 10.0 Cuenca, 31 October: 33.8 µg/m³, 3.5× its usual 9.6 Cuenca, 1 November: 10.2 µg/m³ Cuenca, 2 November: 8.4 µg/m³ Cuenca, 3 November: 7.9 µg/m³ Alcalá de Henares Alcalá de Henares, 27 October: 5.9 µg/m³ Alcalá de Henares, 28 October: 5.5 µg/m³ Alcalá de Henares, 29 October: 6.3 µg/m³ Alcalá de Henares, 30 October: 36.4 µg/m³, 5.1× its usual 7.2 Alcalá de Henares, 31 October: 47.8 µg/m³, 6.8× its usual 7.0 Alcalá de Henares, 1 November: 13.4 µg/m³ Alcalá de Henares, 2 November: 8.5 µg/m³ Alcalá de Henares, 3 November: 10.1 µg/m³ Xàtiva Xàtiva, 27 October: 4.2 µg/m³ Xàtiva, 28 October: 4.8 µg/m³ Xàtiva, 29 October: 9.3 µg/m³ Xàtiva, 30 October: 31.2 µg/m³, 3.3× its usual 9.6 Xàtiva, 31 October: 19.1 µg/m³ Xàtiva, 1 November: 7.4 µg/m³ Xàtiva, 2 November: 6.7 µg/m³ Xàtiva, 3 November: 7.6 µg/m³ Villena Villena, 27 October: 3.0 µg/m³ Villena, 28 October: 3.8 µg/m³ Villena, 29 October: 12.5 µg/m³ Villena, 30 October: 31.0 µg/m³, 5.3× its usual 5.9 Villena, 31 October: 23.9 µg/m³ Villena, 1 November: 6.9 µg/m³ Villena, 2 November: 5.8 µg/m³ Villena, 3 November: 5.7 µg/m³ Collado-Villalba Collado-Villalba, 27 October: 5.2 µg/m³ Collado-Villalba, 28 October: 1.9 µg/m³ Collado-Villalba, 29 October: 5.3 µg/m³ Collado-Villalba, 30 October: 30.1 µg/m³, 3.1× its usual 9.6 Collado-Villalba, 31 October: 35.2 µg/m³, 3.7× its usual 9.6 Collado-Villalba, 1 November: 12.1 µg/m³ Collado-Villalba, 2 November: 8.7 µg/m³ Collado-Villalba, 3 November: 11.5 µg/m³ Lorca Lorca, 27 October: no reading Lorca, 28 October: 4.4 µg/m³ Lorca, 29 October: 20.6 µg/m³ Lorca, 30 October: 28.9 µg/m³, 4.0× its usual 7.3 Lorca, 31 October: 36.9 µg/m³, 5.2× its usual 7.1 Lorca, 1 November: 26.8 µg/m³ Lorca, 2 November: 13.2 µg/m³ Lorca, 3 November: 10.6 µg/m³ Torrejón de Ardoz Torrejón de Ardoz, 27 October: 5.4 µg/m³ Torrejón de Ardoz, 28 October: 7.3 µg/m³ Torrejón de Ardoz, 29 October: 4.5 µg/m³ Torrejón de Ardoz, 30 October: 27.7 µg/m³, 3.5× its usual 8.0 Torrejón de Ardoz, 31 October: 43.9 µg/m³, 5.5× its usual 8.0 Torrejón de Ardoz, 1 November: 13.7 µg/m³ Torrejón de Ardoz, 2 November: 6.8 µg/m³ Torrejón de Ardoz, 3 November: 8.1 µg/m³ Medina del Campo Medina del Campo, 27 October: 3.0 µg/m³ Medina del Campo, 28 October: 2.1 µg/m³ Medina del Campo, 29 October: 4.5 µg/m³ Medina del Campo, 30 October: 27.5 µg/m³, 5.5× its usual 4.0 Medina del Campo, 31 October: 29.9 µg/m³, 6.0× its usual 3.9 Medina del Campo, 1 November: 9.5 µg/m³ Medina del Campo, 2 November: 7.4 µg/m³ Medina del Campo, 3 November: 6.1 µg/m³ Móstoles Móstoles, 27 October: 6.1 µg/m³ Móstoles, 28 October: 3.1 µg/m³ Móstoles, 29 October: 5.7 µg/m³ Móstoles, 30 October: 26.8 µg/m³, 4.2× its usual 6.4 Móstoles, 31 October: 41.5 µg/m³, 7.2× its usual 5.8 Móstoles, 1 November: 14.0 µg/m³ Móstoles, 2 November: 8.7 µg/m³ Móstoles, 3 November: 8.5 µg/m³ Grao de Murviedro Grao de Murviedro, 27 October: 1.6 µg/m³ Grao de Murviedro, 28 October: 3.8 µg/m³ Grao de Murviedro, 29 October: 11.4 µg/m³ Grao de Murviedro, 30 October: 25.9 µg/m³, 5.2× its usual 4.7 Grao de Murviedro, 31 October: 16.5 µg/m³ Grao de Murviedro, 1 November: 5.9 µg/m³ Grao de Murviedro, 2 November: 6.8 µg/m³ Grao de Murviedro, 3 November: 9.9 µg/m³ Fuenlabrada Fuenlabrada, 27 October: 5.8 µg/m³ Fuenlabrada, 28 October: 5.0 µg/m³ Fuenlabrada, 29 October: 5.8 µg/m³ Fuenlabrada, 30 October: 22.8 µg/m³ Fuenlabrada, 31 October: 46.3 µg/m³, 5.3× its usual 8.7 Fuenlabrada, 1 November: 15.5 µg/m³ Fuenlabrada, 2 November: 9.3 µg/m³ Fuenlabrada, 3 November: 9.5 µg/m³ Madrid Madrid, 27 October: 3.4 µg/m³ Madrid, 28 October: 3.0 µg/m³ Madrid, 29 October: 3.9 µg/m³ Madrid, 30 October: 23.4 µg/m³ Madrid, 31 October: 43.8 µg/m³, 7.4× its usual 5.9 Madrid, 1 November: 13.8 µg/m³ Madrid, 2 November: 7.0 µg/m³ Madrid, 3 November: 9.4 µg/m³ Coslada Coslada, 27 October: 4.3 µg/m³ Coslada, 28 October: 3.9 µg/m³ Coslada, 29 October: 4.8 µg/m³ Coslada, 30 October: 18.4 µg/m³ Coslada, 31 October: 43.7 µg/m³, 6.2× its usual 7.1 Coslada, 1 November: 12.6 µg/m³ Coslada, 2 November: 6.4 µg/m³ Coslada, 3 November: 9.1 µg/m³ Barrio de Peral Barrio de Peral, 27 October: no reading Barrio de Peral, 28 October: 5.6 µg/m³ Barrio de Peral, 29 October: no reading Barrio de Peral, 30 October: 16.7 µg/m³ Barrio de Peral, 31 October: 40.6 µg/m³, 5.4× its usual 7.5 Barrio de Peral, 1 November: 17.9 µg/m³ Barrio de Peral, 2 November: 10.4 µg/m³ Barrio de Peral, 3 November: no reading Murcia Murcia, 27 October: no reading Murcia, 28 October: 6.8 µg/m³ Murcia, 29 October: 18.9 µg/m³ Murcia, 30 October: 23.9 µg/m³ Murcia, 31 October: 38.2 µg/m³, 3.9× its usual 9.9 Murcia, 1 November: 28.6 µg/m³ Murcia, 2 November: 13.6 µg/m³ Murcia, 3 November: 15.6 µg/m³ Molina de Segura Molina de Segura, 27 October: no reading Molina de Segura, 28 October: 5.1 µg/m³ Molina de Segura, 29 October: 18.4 µg/m³ Molina de Segura, 30 October: 22.8 µg/m³ Molina de Segura, 31 October: 36.6 µg/m³, 4.7× its usual 7.8 Molina de Segura, 1 November: 27.0 µg/m³ Molina de Segura, 2 November: 9.3 µg/m³ Molina de Segura, 3 November: 12.3 µg/m³ Algete Algete, 27 October: 3.6 µg/m³ Algete, 28 October: 2.5 µg/m³ Algete, 29 October: 4.1 µg/m³ Algete, 30 October: 18.5 µg/m³ Algete, 31 October: 35.3 µg/m³, 7.1× its usual 4.5 Algete, 1 November: 9.9 µg/m³ Algete, 2 November: 6.2 µg/m³ Algete, 3 November: 5.5 µg/m³ Cartagena Cartagena, 27 October: no reading Cartagena, 28 October: 6.5 µg/m³ Cartagena, 29 October: 28.8 µg/m³ Cartagena, 30 October: 12.8 µg/m³ Cartagena, 31 October: 34.7 µg/m³, 4.0× its usual 8.7 Cartagena, 1 November: 18.7 µg/m³ Cartagena, 2 November: 9.2 µg/m³ Cartagena, 3 November: 8.9 µg/m³ Vigo Vigo, 27 October: 9.0 µg/m³ Vigo, 28 October: 11.9 µg/m³ Vigo, 29 October: 15.6 µg/m³ Vigo, 30 October: 20.8 µg/m³ Vigo, 31 October: 32.8 µg/m³, 3.5× its usual 9.4 Vigo, 1 November: 14.5 µg/m³ Vigo, 2 November: 17.5 µg/m³ Vigo, 3 November: 23.9 µg/m³ Valencia Valencia, 27 October: 3.0 µg/m³ Valencia, 28 October: 6.7 µg/m³ Valencia, 29 October: 19.1 µg/m³ Valencia, 30 October: 20.8 µg/m³ Valencia, 31 October: 29.9 µg/m³, 4.5× its usual 6.7 Valencia, 1 November: 11.0 µg/m³ Valencia, 2 November: 10.2 µg/m³ Valencia, 3 November: 13.9 µg/m³ Valdemoro Valdemoro, 27 October: 4.2 µg/m³ Valdemoro, 28 October: 5.0 µg/m³ Valdemoro, 29 October: 4.5 µg/m³ Valdemoro, 30 October: 20.9 µg/m³ Valdemoro, 31 October: 29.9 µg/m³, 4.1× its usual 7.3 Valdemoro, 1 November: 11.7 µg/m³ Valdemoro, 2 November: 8.6 µg/m³ Valdemoro, 3 November: 7.9 µg/m³ Valladolid Valladolid, 27 October: 5.8 µg/m³ Valladolid, 28 October: 6.3 µg/m³ Valladolid, 29 October: 7.5 µg/m³ Valladolid, 30 October: 19.1 µg/m³ Valladolid, 31 October: 27.6 µg/m³, 5.4× its usual 5.1 Valladolid, 1 November: 8.1 µg/m³ Valladolid, 2 November: no reading Valladolid, 3 November: no reading León León, 27 October: 11.0 µg/m³ León, 28 October: 7.0 µg/m³ León, 29 October: 9.1 µg/m³ León, 30 October: 13.9 µg/m³ León, 31 October: 25.7 µg/m³, 4.8× its usual 5.3 León, 1 November: 8.1 µg/m³ León, 2 November: 11.0 µg/m³ León, 3 November: 10.1 µg/m³ 27 Oct 28 29 30 31 1 Nov 2 3 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. Good 0–50
Moderate 51–100
Sensitive groups 101–150
Unhealthy 151–200
Very unhealthy 201–300
Hazardous 301+
Every city it reached
City Days Highest Usual Above usual
Madrid Madrid, Spain 1 31 October 5.9 7.4× Móstoles Madrid, Spain 2 31 October 5.8 7.2× Algete Madrid, Spain 1 31 October 4.5 7.1× Alcalá de Henares Madrid, Spain 2 31 October 7.0 6.8× Coslada Madrid, Spain 1 31 October 7.1 6.2× Medina del Campo Castille and León, Spain 2 31 October 3.9 6.0× Torrejón de Ardoz Madrid, Spain 2 31 October 8.0 5.5× Barrio de Peral Murcia, Spain 1 31 October 7.5 5.4× Valladolid Castille and León, Spain 1 31 October 5.1 5.4× Fuenlabrada Madrid, Spain 1 31 October 8.7 5.3× Villena Valencia, Spain 1 30 October 5.9 5.3× Lorca Murcia, Spain 2 31 October 7.1 5.2× Grao de Murviedro Valencia, Spain 1 30 October 4.7 5.2× León Castille and León, Spain 1 31 October 5.3 4.8× Molina de Segura Murcia, Spain 1 31 October 7.8 4.7× Valencia Valencia, Spain 1 31 October 6.7 4.5× Cuenca Castille-La Mancha, Spain 2 30 October 10.0 4.4× Valdemoro Madrid, Spain 1 31 October 7.3 4.1× Cartagena Murcia, Spain 1 31 October 8.7 4.0× Murcia Murcia, Spain 1 31 October 9.9 3.9× Collado-Villalba Madrid, Spain 2 31 October 9.6 3.7× Vigo Galicia, Spain 1 31 October 9.4 3.5× Xàtiva Valencia, Spain 1 30 October 9.6 3.3×
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 6 of 34 episodes in Spain since our records began, by cities reached.
Spain, France and Portugal, February 2023 72 Spain, Portugal and Andorra, August 2025 44 Spain, France and 2 more countries, December 2023 to January 2024 44 Southern Europe, February 2024 38 Spain, France and Portugal, January and February 2024 33 Northern Spain, October 2024 23 North-eastern Spain, April 2024 20 Canary Islands, Spain, November 2025 15 Canary Islands, Spain, December 2024 15 Canary Islands, Spain, 8 to 9 February 2024 15 Canary Islands, Spain, 16 to 17 December 2023 15 Canary Islands, Spain, 11 to 13 December 2023 15 Bars: cities reached; colour: the level of the episode's highest daily reading. All 34 .
Use this page SmogRank, Northern Spain, October 2024: 23 cities with PM2.5 at twice their usual or more, 30 to 31 October 2024, smogrank.com/episodes/2024-10-northern-spain (accessed 4 October 2026).
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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.
