SmogRank / Episodes / India

Odisha, Chhattisgarh and West Bengal, India, August 2025

For 4 days, from 4 to 7 August 2025, 10 cities in India had PM2.5 at least twice their usual for the time of year. The worst reading was Joda, Odisha, India: 63.7 µg/m³ on 6 August, about 3.1× its usual 20.8. Ended 7 August.

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 reached10in 1 country
Days44 to 7 August 2025
Worst day5 August8 cities counted
Furthest above usual4.5×Angul

Day by day

5 August 8 cities at twice their usual or more
RourkelaKeonjhargarhRairangpurDera Colliery TownshipBaripādaByasanagarCuttackBhubaneswarĀsansolRānīganjKolkataShrīrāmpurBilāspurSingrauliSiltaraRaipurBhilaiDurgDurgapurJājangBarbilHaldiaDurenaBhelaiBelpaharJodaKoīraAngul
1 Aug2345678910
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

BelpaharBelpahar, 1 August: no readingBelpahar, 2 August: 28.7 µg/m³Belpahar, 3 August: 21.0 µg/m³Belpahar, 4 August: 30.7 µg/m³, 2.6× its usual 11.8Belpahar, 5 August: 36.4 µg/m³, 3.1× its usual 11.8Belpahar, 6 August: 23.4 µg/m³Belpahar, 7 August: 24.5 µg/m³Belpahar, 8 August: 12.0 µg/m³Belpahar, 9 August: 21.5 µg/m³Belpahar, 10 August: 17.5 µg/m³JājangJājang, 1 August: 25.9 µg/m³Jājang, 2 August: 29.4 µg/m³Jājang, 3 August: 18.6 µg/m³Jājang, 4 August: 30.1 µg/m³, 2.1× its usual 14.4Jājang, 5 August: 25.6 µg/m³Jājang, 6 August: 26.7 µg/m³, 2.1× its usual 12.9Jājang, 7 August: 21.0 µg/m³Jājang, 8 August: 16.0 µg/m³Jājang, 9 August: 17.4 µg/m³Jājang, 10 August: 12.4 µg/m³BhelaiBhelai, 1 August: 32.0 µg/m³Bhelai, 2 August: 32.0 µg/m³Bhelai, 3 August: 31.9 µg/m³Bhelai, 4 August: 28.0 µg/m³, 2.8× its usual 10.0Bhelai, 5 August: 25.0 µg/m³, 2.5× its usual 10.0Bhelai, 6 August: 25.0 µg/m³, 2.5× its usual 10.0Bhelai, 7 August: 25.1 µg/m³, 2.5× its usual 10.0Bhelai, 8 August: 24.9 µg/m³Bhelai, 9 August: 25.0 µg/m³Bhelai, 10 August: 24.9 µg/m³DurenaDurena, 1 August: 32.0 µg/m³Durena, 2 August: 32.0 µg/m³Durena, 3 August: 31.9 µg/m³Durena, 4 August: 28.0 µg/m³, 2.8× its usual 10.0Durena, 5 August: 25.0 µg/m³, 2.5× its usual 10.0Durena, 6 August: 25.0 µg/m³, 2.5× its usual 10.0Durena, 7 August: 25.1 µg/m³, 2.5× its usual 10.0Durena, 8 August: 24.9 µg/m³Durena, 9 August: 25.0 µg/m³Durena, 10 August: 24.9 µg/m³JodaJoda, 1 August: no readingJoda, 2 August: 49.7 µg/m³Joda, 3 August: 43.3 µg/m³Joda, 4 August: 40.7 µg/m³Joda, 5 August: 60.0 µg/m³, 2.4× its usual 24.9Joda, 6 August: 63.7 µg/m³, 3.1× its usual 20.8Joda, 7 August: 30.3 µg/m³Joda, 8 August: 24.0 µg/m³Joda, 9 August: no readingJoda, 10 August: no readingBarbilBarbil, 1 August: 24.6 µg/m³Barbil, 2 August: 39.2 µg/m³Barbil, 3 August: 28.0 µg/m³Barbil, 4 August: 33.5 µg/m³Barbil, 5 August: 42.7 µg/m³, 2.1× its usual 20.1Barbil, 6 August: 36.4 µg/m³Barbil, 7 August: 24.8 µg/m³Barbil, 8 August: 20.0 µg/m³Barbil, 9 August: 18.7 µg/m³Barbil, 10 August: 22.2 µg/m³DurgapurDurgapur, 1 August: 24.0 µg/m³Durgapur, 2 August: 26.3 µg/m³Durgapur, 3 August: 26.2 µg/m³Durgapur, 4 August: 33.1 µg/m³Durgapur, 5 August: 39.7 µg/m³, 2.0× its usual 19.4Durgapur, 6 August: 27.2 µg/m³Durgapur, 7 August: 24.3 µg/m³Durgapur, 8 August: 19.3 µg/m³Durgapur, 9 August: 28.3 µg/m³Durgapur, 10 August: 21.7 µg/m³AngulAngul, 1 August: no readingAngul, 2 August: 37.2 µg/m³Angul, 3 August: 22.5 µg/m³Angul, 4 August: 24.4 µg/m³Angul, 5 August: 35.5 µg/m³, 2.2× its usual 15.8Angul, 6 August: 60.9 µg/m³, 4.5× its usual 13.6Angul, 7 August: 19.8 µg/m³Angul, 8 August: 20.2 µg/m³Angul, 9 August: 13.6 µg/m³Angul, 10 August: 17.2 µg/m³KoīraKoīra, 1 August: no readingKoīra, 2 August: 27.0 µg/m³Koīra, 3 August: 16.2 µg/m³Koīra, 4 August: 23.5 µg/m³Koīra, 5 August: 29.2 µg/m³, 3.3× its usual 8.9Koīra, 6 August: 27.0 µg/m³, 3.1× its usual 8.7Koīra, 7 August: 28.2 µg/m³, 3.2× its usual 8.7Koīra, 8 August: 14.9 µg/m³Koīra, 9 August: 12.1 µg/m³Koīra, 10 August: no readingHaldiaHaldia, 1 August: 21.5 µg/m³Haldia, 2 August: 24.1 µg/m³Haldia, 3 August: 24.5 µg/m³Haldia, 4 August: 21.9 µg/m³Haldia, 5 August: 24.9 µg/m³Haldia, 6 August: 22.8 µg/m³Haldia, 7 August: 31.4 µg/m³, 2.4× its usual 13.3Haldia, 8 August: 22.5 µg/m³Haldia, 9 August: 15.0 µg/m³Haldia, 10 August: 15.0 µg/m³1 Aug2345678910
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
AngulOdisha, India2 60.96 August13.64.5×
KoīraOdisha, India3 29.25 August8.93.3×
JodaOdisha, India2 63.76 August20.83.1×
BelpaharOdisha, India2 36.45 August11.83.1×
BhelaiChhattisgarh, India4 28.04 August10.02.8×
DurenaChhattisgarh, India4 28.04 August10.02.8×
HaldiaWest Bengal, India1 31.47 August13.32.4×
BarbilOdisha, India1 42.75 August20.12.1×
JājangOdisha, India2 30.14 August14.42.1×
DurgapurWest Bengal, India1 39.75 August19.42.0×

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 41 of 61 episodes in India since our records began, by cities reached.

Bars: cities reached; colour: the level of the episode's highest daily reading. All 61.

Use this page

SmogRank, Odisha, Chhattisgarh and West Bengal, India, August 2025: 10 cities with PM2.5 at twice their usual or more, 4 to 7 August 2025, smogrank.com/episodes/2025-08-odisha-chhattisgarh-and-west-bengal-india (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. Fire detections from NASA FIRMS; smoke maps from NOAA HMS.