SmogRank / Episodes / India

Bihar and Odisha, India, October 2025

For 3 days, from 23 to 25 October 2025, 10 cities in India had PM2.5 at least twice their usual for the time of year. The worst reading was Barbil, Odisha, India: 114.0 µg/m³ on 25 October, about 4.1× its usual 27.8.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached10in 1 country
Days323 to 25 October 2025
Worst day23 October8 cities counted
Furthest above usual6.7×Aurangābād

Day by day

23 October 8 cities at twice their usual or more
GayaRājgīrSasarāmRourkelaArrahHājīpurJodaĀsansolChāpraRairangpurBuxarMungerRānīganjSamāstipurDurgapurMuzaffarpurBhāgalpurBelpaharSiwānSaharsaVaranasiBaripādaPurniaShrīrāmpurBilāspurHaldiaKolkataPrayagrajKishanganjSatnaMaiharPatnaBihār SharīfSingrauliArāriaKatiharBhelaiBarbilBegusaraiKeonjhargarhAurangābād
20 Oct2122232425262728
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

BarbilBarbil, 20 October: 129.0 µg/m³, 4.6× usualBarbil, 21 October: 115.0 µg/m³, 4.1× usualBarbil, 22 October: 83.7 µg/m³, 3.0× usualBarbil, 23 October: 86.9 µg/m³, 3.1× usualBarbil, 24 October: 83.8 µg/m³, 3.0× usualBarbil, 25 October: 114.0 µg/m³, 4.1× usualBarbil, 26 October: no readingBarbil, 27 October: 28.8 µg/m³, 1.0× usualBarbil, 28 October: 20.7 µg/m³, 0.7× usualSingrauliSingrauli, 20 October: 102.0 µg/m³, 1.9× usualSingrauli, 21 October: 89.4 µg/m³, 1.7× usualSingrauli, 22 October: 48.9 µg/m³, 0.9× usualSingrauli, 23 October: 103.0 µg/m³, 2.0× usualSingrauli, 24 October: 111.0 µg/m³, 2.1× usualSingrauli, 25 October: 85.6 µg/m³, 1.6× usualSingrauli, 26 October: no readingSingrauli, 27 October: 59.2 µg/m³, 1.1× usualSingrauli, 28 October: 65.9 µg/m³, 1.3× usualPatnaPatna, 20 October: 85.7 µg/m³, 2.3× usualPatna, 21 October: 132.0 µg/m³, 3.6× usualPatna, 22 October: 79.2 µg/m³, 2.1× usualPatna, 23 October: 74.2 µg/m³, 2.0× usualPatna, 24 October: 72.5 µg/m³, 2.0× usualPatna, 25 October: 48.2 µg/m³, 1.3× usualPatna, 26 October: no readingPatna, 27 October: 61.1 µg/m³, 1.7× usualPatna, 28 October: 48.9 µg/m³, 1.3× usualKatiharKatihar, 20 October: 80.7 µg/m³, 3.8× usualKatihar, 21 October: 41.8 µg/m³, 1.9× usualKatihar, 22 October: 55.6 µg/m³, 2.6× usualKatihar, 23 October: 50.7 µg/m³, 2.4× usualKatihar, 24 October: 48.7 µg/m³, 2.3× usualKatihar, 25 October: 37.0 µg/m³, 1.7× usualKatihar, 26 October: no readingKatihar, 27 October: 30.4 µg/m³, 1.4× usualKatihar, 28 October: 24.2 µg/m³, 1.1× usualBegusaraiBegusarai, 20 October: 71.6 µg/m³, 4.5× usualBegusarai, 21 October: 87.9 µg/m³, 5.5× usualBegusarai, 22 October: 77.6 µg/m³, 4.9× usualBegusarai, 23 October: 66.4 µg/m³, 4.2× usualBegusarai, 24 October: 66.4 µg/m³, 4.2× usualBegusarai, 25 October: 66.2 µg/m³, 4.2× usualBegusarai, 26 October: no readingBegusarai, 27 October: 64.7 µg/m³, 4.1× usualBegusarai, 28 October: 66.6 µg/m³, 4.2× usualKeonjhargarhKeonjhargarh, 20 October: 29.5 µg/m³, 2.0× usualKeonjhargarh, 21 October: 54.0 µg/m³, 3.6× usualKeonjhargarh, 22 October: 97.4 µg/m³, 6.5× usualKeonjhargarh, 23 October: 69.2 µg/m³, 4.6× usualKeonjhargarh, 24 October: 70.9 µg/m³, 4.7× usualKeonjhargarh, 25 October: 68.1 µg/m³, 4.5× usualKeonjhargarh, 26 October: no readingKeonjhargarh, 27 October: 55.3 µg/m³, 3.7× usualKeonjhargarh, 28 October: 11.6 µg/m³, 0.8× usualBihār SharīfBihār Sharīf, 20 October: no readingBihār Sharīf, 21 October: 129.0 µg/m³, 3.8× usualBihār Sharīf, 22 October: 79.5 µg/m³, 2.3× usualBihār Sharīf, 23 October: 61.8 µg/m³, 1.8× usualBihār Sharīf, 24 October: 67.6 µg/m³, 2.0× usualBihār Sharīf, 25 October: 71.9 µg/m³, 2.1× usualBihār Sharīf, 26 October: no readingBihār Sharīf, 27 October: 88.0 µg/m³, 2.6× usualBihār Sharīf, 28 October: 67.9 µg/m³, 2.0× usualArāriaArāria, 20 October: 62.4 µg/m³, 1.9× usualArāria, 21 October: 102.0 µg/m³, 3.0× usualArāria, 22 October: 60.7 µg/m³, 1.8× usualArāria, 23 October: 63.7 µg/m³, 1.9× usualArāria, 24 October: 48.9 µg/m³, 1.5× usualArāria, 25 October: 72.9 µg/m³, 2.2× usualArāria, 26 October: no readingArāria, 27 October: 50.3 µg/m³, 1.5× usualArāria, 28 October: 51.3 µg/m³, 1.5× usualAurangābādAurangābād, 20 October: 26.6 µg/m³, 3.0× usualAurangābād, 21 October: 80.7 µg/m³, 9.0× usualAurangābād, 22 October: 61.2 µg/m³, 6.8× usualAurangābād, 23 October: 57.6 µg/m³, 6.4× usualAurangābād, 24 October: 60.4 µg/m³, 6.7× usualAurangābād, 25 October: 54.0 µg/m³, 6.0× usualAurangābād, 26 October: no readingAurangābād, 27 October: 62.5 µg/m³, 6.9× usualAurangābād, 28 October: 55.9 µg/m³, 6.2× usualBhelaiBhelai, 20 October: 51.3 µg/m³, 5.1× usualBhelai, 21 October: 38.4 µg/m³, 3.8× usualBhelai, 22 October: 38.4 µg/m³, 3.8× usualBhelai, 23 October: 38.4 µg/m³, 3.8× usualBhelai, 24 October: 38.4 µg/m³, 3.8× usualBhelai, 25 October: 38.4 µg/m³, 3.8× usualBhelai, 26 October: no readingBhelai, 27 October: 38.4 µg/m³, 3.8× usualBhelai, 28 October: 38.4 µg/m³, 3.8× usual20 Oct2122232425262728
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
AurangābādBihar, India3 80.721 October9.09.0×
KeonjhargarhOdisha, India3 97.422 October15.06.5×
BegusaraiBihar, India2 87.921 October15.95.5×
BhelaiChhattisgarh, India3 51.320 October10.05.1×
BarbilOdisha, India3 129.020 October27.84.6×
Bihār SharīfBihar, India1 129.021 October34.03.8×
KatiharBihar, India2 80.720 October21.53.8×
PatnaBihar, India1 132.021 October37.03.6×
ArāriaBihar, India1 102.021 October33.63.0×
SingrauliMadhya Pradesh, India2 111.024 October52.72.1×

Daily means in µg/m³. Usual: the city's median for this time of year (its days within 21 days of the date, every year, leaving out the week around it). Above usual: its highest day against that.

Against other episodes in India

Number 40 of 54 episodes in India since our records began, by cities reached.

Bars: cities reached; colour: the level of the episode's highest daily reading. All 54.

Use this page

SmogRank, Bihar and Odisha, India, October 2025: 10 cities with PM2.5 at twice their usual or more, 23 to 25 October 2025, smogrank.com/episodes/2025-10-bihar-and-odisha-india (accessed 2 October 2026).

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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.