SmogRank / Episodes / Norway
Southern Norway, 5 to 10 January 2024
For 6 days, from 5 to 10 January 2024, 14 cities in Norway had PM2.5 at least twice their usual for the time of year. The worst reading was Fredrikstad, Østfold, Norway: 91.5 µg/m³ on 10 January, about 11× its usual 8.0. Ended 10 January.
No cause named We have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached 14 in 1 country
Days 6 5 to 10 January 2024
Worst day 8 January 13 cities counted
Furthest above usual 11× Fredrikstad
Day by day
Play 8 January 13 cities at twice their usual or more
Kristiansand Lillehammer Nesttun Åsane Gothenburg Porsgrunn Hamar Drammen Gjøvik Bergen Nesoddtangen Elverum Sarpsborg Strømmen Lillestrøm Brumunddal Oslo Moss Fredrikstad 2 Jan 3 4 5 6 7 8 9 10 11 12 13 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
Nesoddtangen Nesoddtangen, 2 January: no reading Nesoddtangen, 3 January: no reading Nesoddtangen, 4 January: 18.3 µg/m³ Nesoddtangen, 5 January: 39.5 µg/m³, 2.4× its usual 16.5 Nesoddtangen, 6 January: 74.7 µg/m³, 4.5× its usual 16.6 Nesoddtangen, 7 January: 68.7 µg/m³, 4.2× its usual 16.5 Nesoddtangen, 8 January: 56.1 µg/m³, 3.8× its usual 14.7 Nesoddtangen, 9 January: 65.7 µg/m³, 5.3× its usual 12.3 Nesoddtangen, 10 January: 57.6 µg/m³, 4.6× its usual 12.6 Nesoddtangen, 11 January: 22.1 µg/m³ Nesoddtangen, 12 January: 30.5 µg/m³ Nesoddtangen, 13 January: 42.6 µg/m³ Brumunddal Brumunddal, 2 January: no reading Brumunddal, 3 January: no reading Brumunddal, 4 January: no reading Brumunddal, 5 January: 33.3 µg/m³, 2.8× its usual 11.7 Brumunddal, 6 January: 73.0 µg/m³, 6.2× its usual 11.7 Brumunddal, 7 January: 61.3 µg/m³, 5.2× its usual 11.7 Brumunddal, 8 January: 86.1 µg/m³, 6.9× its usual 12.4 Brumunddal, 9 January: 78.4 µg/m³, 6.2× its usual 12.6 Brumunddal, 10 January: 44.1 µg/m³, 3.5× its usual 12.6 Brumunddal, 11 January: 10.9 µg/m³ Brumunddal, 12 January: 16.4 µg/m³ Brumunddal, 13 January: 19.0 µg/m³ Lillestrøm Lillestrøm, 2 January: no reading Lillestrøm, 3 January: no reading Lillestrøm, 4 January: 19.8 µg/m³ Lillestrøm, 5 January: 30.4 µg/m³, 3.1× its usual 9.7 Lillestrøm, 6 January: 37.6 µg/m³, 3.9× its usual 9.6 Lillestrøm, 7 January: 43.1 µg/m³, 4.5× its usual 9.6 Lillestrøm, 8 January: 50.1 µg/m³, 5.2× its usual 9.6 Lillestrøm, 9 January: 56.1 µg/m³, 6.0× its usual 9.3 Lillestrøm, 10 January: 61.2 µg/m³, 6.8× its usual 9.0 Lillestrøm, 11 January: 23.3 µg/m³ Lillestrøm, 12 January: 23.1 µg/m³ Lillestrøm, 13 January: 21.7 µg/m³ Strømmen Strømmen, 2 January: no reading Strømmen, 3 January: no reading Strømmen, 4 January: 11.3 µg/m³ Strømmen, 5 January: 29.0 µg/m³, 2.9× its usual 9.9 Strømmen, 6 January: 34.7 µg/m³, 3.5× its usual 9.9 Strømmen, 7 January: 35.6 µg/m³, 3.6× its usual 9.9 Strømmen, 8 January: 40.3 µg/m³, 4.1× its usual 9.8 Strømmen, 9 January: 57.7 µg/m³, 5.9× its usual 9.8 Strømmen, 10 January: 39.1 µg/m³, 4.0× its usual 9.8 Strømmen, 11 January: 14.6 µg/m³ Strømmen, 12 January: 20.5 µg/m³ Strømmen, 13 January: 28.1 µg/m³ Fredrikstad Fredrikstad, 2 January: no reading Fredrikstad, 3 January: no reading Fredrikstad, 4 January: 11.1 µg/m³ Fredrikstad, 5 January: 26.7 µg/m³, 3.3× its usual 8.2 Fredrikstad, 6 January: 52.4 µg/m³, 6.4× its usual 8.2 Fredrikstad, 7 January: 49.3 µg/m³, 6.0× its usual 8.2 Fredrikstad, 8 January: 61.7 µg/m³, 7.6× its usual 8.1 Fredrikstad, 9 January: 77.3 µg/m³, 9.8× its usual 7.9 Fredrikstad, 10 January: 91.5 µg/m³, 11× its usual 8.0 Fredrikstad, 11 January: 58.7 µg/m³ Fredrikstad, 12 January: 74.6 µg/m³ Fredrikstad, 13 January: 46.6 µg/m³ Bergen Bergen, 2 January: no reading Bergen, 3 January: no reading Bergen, 4 January: 22.6 µg/m³ Bergen, 5 January: 26.5 µg/m³, 4.0× its usual 6.7 Bergen, 6 January: 30.4 µg/m³, 4.5× its usual 6.8 Bergen, 7 January: 28.2 µg/m³, 4.1× its usual 6.9 Bergen, 8 January: 31.2 µg/m³, 4.5× its usual 7.0 Bergen, 9 January: 7.7 µg/m³ Bergen, 10 January: 7.3 µg/m³ Bergen, 11 January: 6.9 µg/m³ Bergen, 12 January: 7.7 µg/m³ Bergen, 13 January: 6.0 µg/m³ Elverum Elverum, 2 January: no reading Elverum, 3 January: no reading Elverum, 4 January: 6.8 µg/m³ Elverum, 5 January: 7.2 µg/m³ Elverum, 6 January: 42.0 µg/m³, 4.9× its usual 8.5 Elverum, 7 January: 22.8 µg/m³ Elverum, 8 January: 39.1 µg/m³, 4.4× its usual 8.9 Elverum, 9 January: 42.8 µg/m³, 4.9× its usual 8.8 Elverum, 10 January: 32.6 µg/m³, 3.6× its usual 9.0 Elverum, 11 January: 10.1 µg/m³ Elverum, 12 January: 25.0 µg/m³ Elverum, 13 January: 20.4 µg/m³ Porsgrunn Porsgrunn, 2 January: no reading Porsgrunn, 3 January: no reading Porsgrunn, 4 January: 9.9 µg/m³ Porsgrunn, 5 January: 19.8 µg/m³ Porsgrunn, 6 January: 37.7 µg/m³, 3.1× its usual 12.3 Porsgrunn, 7 January: 41.4 µg/m³, 3.4× its usual 12.3 Porsgrunn, 8 January: 36.7 µg/m³, 3.0× its usual 12.2 Porsgrunn, 9 January: 42.2 µg/m³, 3.5× its usual 12.0 Porsgrunn, 10 January: 33.1 µg/m³, 2.8× its usual 11.7 Porsgrunn, 11 January: 17.8 µg/m³ Porsgrunn, 12 January: 28.5 µg/m³ Porsgrunn, 13 January: 33.3 µg/m³ Oslo Oslo, 2 January: no reading Oslo, 3 January: no reading Oslo, 4 January: 7.1 µg/m³ Oslo, 5 January: 19.9 µg/m³ Oslo, 6 January: 33.3 µg/m³, 4.4× its usual 7.5 Oslo, 7 January: 32.0 µg/m³, 4.3× its usual 7.5 Oslo, 8 January: 36.7 µg/m³, 5.0× its usual 7.4 Oslo, 9 January: 54.0 µg/m³, 7.3× its usual 7.4 Oslo, 10 January: 39.3 µg/m³, 5.2× its usual 7.5 Oslo, 11 January: 17.5 µg/m³ Oslo, 12 January: 22.4 µg/m³ Oslo, 13 January: 30.1 µg/m³ Moss Moss, 2 January: no reading Moss, 3 January: no reading Moss, 4 January: 4.6 µg/m³ Moss, 5 January: 11.8 µg/m³ Moss, 6 January: 32.5 µg/m³, 4.6× its usual 7.0 Moss, 7 January: 26.6 µg/m³, 3.7× its usual 7.2 Moss, 8 January: 31.9 µg/m³, 4.6× its usual 7.0 Moss, 9 January: 42.1 µg/m³, 6.1× its usual 6.9 Moss, 10 January: 52.8 µg/m³, 7.5× its usual 7.0 Moss, 11 January: 14.9 µg/m³ Moss, 12 January: 29.6 µg/m³ Moss, 13 January: 30.1 µg/m³ Sarpsborg Sarpsborg, 2 January: no reading Sarpsborg, 3 January: no reading Sarpsborg, 4 January: 5.5 µg/m³ Sarpsborg, 5 January: 14.2 µg/m³ Sarpsborg, 6 January: 29.7 µg/m³, 3.2× its usual 9.4 Sarpsborg, 7 January: 31.4 µg/m³, 3.3× its usual 9.4 Sarpsborg, 8 January: 37.5 µg/m³, 4.2× its usual 8.9 Sarpsborg, 9 January: 52.2 µg/m³, 6.0× its usual 8.7 Sarpsborg, 10 January: 55.4 µg/m³, 5.9× its usual 9.4 Sarpsborg, 11 January: 66.6 µg/m³ Sarpsborg, 12 January: 43.4 µg/m³ Sarpsborg, 13 January: 41.2 µg/m³ Gjøvik Gjøvik, 2 January: no reading Gjøvik, 3 January: no reading Gjøvik, 4 January: 11.0 µg/m³ Gjøvik, 5 January: 20.9 µg/m³ Gjøvik, 6 January: 25.1 µg/m³, 3.3× its usual 7.7 Gjøvik, 7 January: 20.8 µg/m³ Gjøvik, 8 January: 25.9 µg/m³, 3.4× its usual 7.7 Gjøvik, 9 January: 33.8 µg/m³, 4.4× its usual 7.7 Gjøvik, 10 January: 11.7 µg/m³ Gjøvik, 11 January: 2.8 µg/m³ Gjøvik, 12 January: 9.0 µg/m³ Gjøvik, 13 January: 8.3 µg/m³ Drammen Drammen, 2 January: no reading Drammen, 3 January: no reading Drammen, 4 January: 12.7 µg/m³ Drammen, 5 January: 8.9 µg/m³ Drammen, 6 January: 17.4 µg/m³ Drammen, 7 January: 39.7 µg/m³, 3.9× its usual 10.2 Drammen, 8 January: 18.7 µg/m³ Drammen, 9 January: 19.7 µg/m³ Drammen, 10 January: 16.2 µg/m³ Drammen, 11 January: 20.0 µg/m³ Drammen, 12 January: 35.7 µg/m³ Drammen, 13 January: 45.1 µg/m³ Hamar Hamar, 2 January: no reading Hamar, 3 January: no reading Hamar, 4 January: no reading Hamar, 5 January: no reading Hamar, 6 January: no reading Hamar, 7 January: 28.8 µg/m³, 2.1× its usual 13.4 Hamar, 8 January: 38.7 µg/m³, 2.8× its usual 13.6 Hamar, 9 January: 52.4 µg/m³, 3.8× its usual 13.7 Hamar, 10 January: 46.4 µg/m³, 3.3× its usual 14.0 Hamar, 11 January: 18.1 µg/m³ Hamar, 12 January: 26.6 µg/m³ Hamar, 13 January: 22.1 µg/m³ 2 Jan 4 6 8 10 12 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
Fredrikstad Østfold, Norway 6 10 January 8.0 11× Moss Østfold, Norway 5 10 January 7.0 7.5× Oslo Oslo, Norway 5 9 January 7.4 7.3× Brumunddal Innlandet, Norway 6 8 January 12.4 6.9× Lillestrøm Akershus, Norway 6 10 January 9.0 6.8× Strømmen Akershus, Norway 6 9 January 9.8 5.9× Sarpsborg Østfold, Norway 5 10 January 9.4 5.9× Elverum Innlandet, Norway 4 9 January 8.8 4.9× Nesoddtangen Akershus, Norway 6 6 January 16.6 4.5× Bergen Vestland, Norway 4 8 January 7.0 4.5× Gjøvik Innlandet, Norway 3 9 January 7.7 4.4× Drammen Buskerud, Norway 1 7 January 10.2 3.9× Hamar Innlandet, Norway 4 9 January 13.7 3.8× Porsgrunn Telemark, Norway 5 9 January 12.0 3.5×
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 Norway
The largest of 5 episodes in Norway since our records began, by cities reached.
Bars: cities reached; colour: the level of the episode's highest daily reading.
Use this page SmogRank, Southern Norway, 5 to 10 January 2024: 14 cities with PM2.5 at twice their usual or more, 5 to 10 January 2024, smogrank.com/episodes/2024-01-05-southern-norway (accessed 5 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.
