SmogRank / Episodes / India

Odisha, Bihar and West Bengal, India, August 2025

For 1 day, on 12 August 2025, 11 cities in India had PM2.5 at least twice their usual for the time of year. The worst reading was Bhāgalpur, Bihar, India: 83.1 µg/m³ on 12 August, about 3.0× its usual 28.1.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached11in 1 country
Days112 August 2025
Worst day12 August11 cities counted
Furthest above usual4.2×Joda

Day by day

12 August 11 cities at twice their usual or more
RairangpurKeonjhargarhBaripādaRājgīrDera Colliery TownshipByasanagarBihār SharīfBegusaraiSasarāmMungerPatnaArrahHaldiaShrīrāmpurKolkataBuxarBhelaiSingrauliKatiharVaranasiBilāspurRaipurPrayagrajBhilaiDurgBarbilDurgapurRourkelaAurangābādRānīganjAngulĀsansolGayaBhāgalpurBelpaharJoda
9 Aug101112131415
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

BhāgalpurBhāgalpur, 9 August: 47.4 µg/m³Bhāgalpur, 10 August: 44.6 µg/m³Bhāgalpur, 11 August: 41.3 µg/m³Bhāgalpur, 12 August: 83.1 µg/m³, 3.0× its usual 28.1Bhāgalpur, 13 August: 43.7 µg/m³Bhāgalpur, 14 August: 15.3 µg/m³Bhāgalpur, 15 August: 10.5 µg/m³JodaJoda, 9 August: no readingJoda, 10 August: no readingJoda, 11 August: no readingJoda, 12 August: 80.4 µg/m³, 4.2× its usual 19.3Joda, 13 August: 41.1 µg/m³Joda, 14 August: 7.2 µg/m³Joda, 15 August: 7.2 µg/m³AurangābādAurangābād, 9 August: 26.6 µg/m³Aurangābād, 10 August: 32.8 µg/m³Aurangābād, 11 August: 47.1 µg/m³Aurangābād, 12 August: 70.5 µg/m³, 2.5× its usual 28.4Aurangābād, 13 August: 31.6 µg/m³Aurangābād, 14 August: 42.9 µg/m³Aurangābād, 15 August: 30.5 µg/m³GayaGaya, 9 August: 32.9 µg/m³Gaya, 10 August: 33.6 µg/m³Gaya, 11 August: 31.3 µg/m³Gaya, 12 August: 62.5 µg/m³, 2.9× its usual 21.3Gaya, 13 August: 27.4 µg/m³Gaya, 14 August: 15.0 µg/m³Gaya, 15 August: 13.0 µg/m³RourkelaRourkela, 9 August: 24.0 µg/m³Rourkela, 10 August: 28.3 µg/m³Rourkela, 11 August: 33.1 µg/m³Rourkela, 12 August: 50.0 µg/m³, 2.4× its usual 21.0Rourkela, 13 August: 31.0 µg/m³Rourkela, 14 August: 17.1 µg/m³Rourkela, 15 August: 5.9 µg/m³BelpaharBelpahar, 9 August: 21.5 µg/m³Belpahar, 10 August: 17.5 µg/m³Belpahar, 11 August: 26.4 µg/m³Belpahar, 12 August: 49.6 µg/m³, 4.2× its usual 11.8Belpahar, 13 August: 16.8 µg/m³Belpahar, 14 August: 5.1 µg/m³Belpahar, 15 August: 5.9 µg/m³RānīganjRānīganj, 9 August: 26.2 µg/m³Rānīganj, 10 August: 22.4 µg/m³Rānīganj, 11 August: 25.6 µg/m³Rānīganj, 12 August: 46.6 µg/m³, 2.6× its usual 18.2Rānīganj, 13 August: 14.0 µg/m³Rānīganj, 14 August: 12.9 µg/m³Rānīganj, 15 August: 18.5 µg/m³ĀsansolĀsansol, 9 August: 31.8 µg/m³Āsansol, 10 August: 29.2 µg/m³Āsansol, 11 August: 33.1 µg/m³Āsansol, 12 August: 45.6 µg/m³, 2.9× its usual 16.0Āsansol, 13 August: 19.3 µg/m³Āsansol, 14 August: 11.4 µg/m³Āsansol, 15 August: 14.2 µg/m³DurgapurDurgapur, 9 August: 28.3 µg/m³Durgapur, 10 August: 21.7 µg/m³Durgapur, 11 August: 26.0 µg/m³Durgapur, 12 August: 45.4 µg/m³, 2.3× its usual 19.5Durgapur, 13 August: 18.0 µg/m³Durgapur, 14 August: 7.6 µg/m³Durgapur, 15 August: 13.8 µg/m³BarbilBarbil, 9 August: 18.7 µg/m³Barbil, 10 August: 22.2 µg/m³Barbil, 11 August: 29.9 µg/m³Barbil, 12 August: 44.6 µg/m³, 2.1× its usual 21.5Barbil, 13 August: no readingBarbil, 14 August: 4.3 µg/m³Barbil, 15 August: 5.6 µg/m³AngulAngul, 9 August: 13.6 µg/m³Angul, 10 August: 17.2 µg/m³Angul, 11 August: 31.5 µg/m³Angul, 12 August: 39.8 µg/m³, 2.8× its usual 14.1Angul, 13 August: 20.4 µg/m³Angul, 14 August: 14.4 µg/m³Angul, 15 August: 9.4 µg/m³9 Aug101112131415
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
JodaOdisha, India1 80.412 August19.34.2×
BelpaharOdisha, India1 49.612 August11.84.2×
BhāgalpurBihar, India1 83.112 August28.13.0×
GayaBihar, India1 62.512 August21.32.9×
ĀsansolWest Bengal, India1 45.612 August16.02.9×
AngulOdisha, India1 39.812 August14.12.8×
RānīganjWest Bengal, India1 46.612 August18.22.6×
AurangābādBihar, India1 70.512 August28.42.5×
RourkelaOdisha, India1 50.012 August21.02.4×
DurgapurWest Bengal, India1 45.412 August19.52.3×
BarbilOdisha, India1 44.612 August21.52.1×

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 India

Number 36 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, Odisha, Bihar and West Bengal, India, August 2025: 11 cities with PM2.5 at twice their usual or more, 12 August 2025, smogrank.com/episodes/2025-08-odisha-bihar-and-west-bengal-india (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.