SmogRank / Episodes / India

Odisha and West Bengal, India, May 2025

For 2 days, from 10 to 11 May 2025, 8 cities in India had PM2.5 at least twice their usual for the time of year. The worst reading was Cuttack, Odisha, India: 74.0 µg/m³ on 11 May, about 4.2× its usual 17.8.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached8in 1 country
Days210 to 11 May 2025
Worst day10 May5 cities counted
Furthest above usual4.2×Cuttack

Day by day

10 May 5 cities at twice their usual or more
DurgapurJodaKeonjhargarhRourkelaShrīrāmpurHaldiaKolkataRājgīrBhāgalpurGayaMungerDera Colliery TownshipBegusaraiAngulAurangābādBhubaneswarSaharsaBelpaharPatnaSamāstipurPurniaHājīpurArrahSasarāmChāpraBuxarBhelaiSingrauliVaranasiBilāspurBarbilByasanagarRānīganjĀsansolBaripādaKatiharRairangpurCuttack
7 May891011121314
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

CuttackCuttack, 7 May: 62.7 µg/m³, 3.5× usualCuttack, 8 May: 48.9 µg/m³, 2.7× usualCuttack, 9 May: 65.2 µg/m³, 3.7× usualCuttack, 10 May: 69.2 µg/m³, 3.9× usualCuttack, 11 May: 74.0 µg/m³, 4.2× usualCuttack, 12 May: 68.6 µg/m³, 3.9× usualCuttack, 13 May: 62.4 µg/m³, 3.5× usualCuttack, 14 May: 57.9 µg/m³, 3.3× usualKatiharKatihar, 7 May: 29.5 µg/m³, 2.2× usualKatihar, 8 May: 31.3 µg/m³, 2.3× usualKatihar, 9 May: no readingKatihar, 10 May: 33.8 µg/m³, 2.5× usualKatihar, 11 May: 27.5 µg/m³, 2.1× usualKatihar, 12 May: 18.0 µg/m³, 1.3× usualKatihar, 13 May: 16.2 µg/m³, 1.2× usualKatihar, 14 May: 21.5 µg/m³, 1.6× usualRairangpurRairangpur, 7 May: 44.5 µg/m³, 2.1× usualRairangpur, 8 May: 48.7 µg/m³, 2.3× usualRairangpur, 9 May: 46.3 µg/m³, 2.1× usualRairangpur, 10 May: 64.4 µg/m³, 3.0× usualRairangpur, 11 May: 62.7 µg/m³, 2.9× usualRairangpur, 12 May: no readingRairangpur, 13 May: 31.4 µg/m³, 1.5× usualRairangpur, 14 May: 41.0 µg/m³, 1.9× usualĀsansolĀsansol, 7 May: 54.2 µg/m³, 1.8× usualĀsansol, 8 May: 50.3 µg/m³, 1.7× usualĀsansol, 9 May: 61.8 µg/m³, 2.1× usualĀsansol, 10 May: 64.2 µg/m³, 2.2× usualĀsansol, 11 May: 50.0 µg/m³, 1.7× usualĀsansol, 12 May: 48.7 µg/m³, 1.7× usualĀsansol, 13 May: 51.7 µg/m³, 1.8× usualĀsansol, 14 May: 48.5 µg/m³, 1.6× usualRānīganjRānīganj, 7 May: 38.0 µg/m³, 1.7× usualRānīganj, 8 May: 32.4 µg/m³, 1.4× usualRānīganj, 9 May: 40.3 µg/m³, 1.8× usualRānīganj, 10 May: 47.5 µg/m³, 2.1× usualRānīganj, 11 May: 40.4 µg/m³, 1.8× usualRānīganj, 12 May: 36.9 µg/m³, 1.6× usualRānīganj, 13 May: 33.2 µg/m³, 1.5× usualRānīganj, 14 May: 33.3 µg/m³, 1.5× usualBarbilBarbil, 7 May: 38.1 µg/m³, 1.3× usualBarbil, 8 May: 34.6 µg/m³, 1.1× usualBarbil, 9 May: 39.7 µg/m³, 1.3× usualBarbil, 10 May: 52.5 µg/m³, 1.7× usualBarbil, 11 May: 60.9 µg/m³, 2.0× usualBarbil, 12 May: 58.3 µg/m³, 1.9× usualBarbil, 13 May: 32.1 µg/m³, 1.1× usualBarbil, 14 May: 44.1 µg/m³, 1.5× usualBaripādaBaripāda, 7 May: 23.6 µg/m³, 1.0× usualBaripāda, 8 May: 37.7 µg/m³, 1.6× usualBaripāda, 9 May: 35.1 µg/m³, 1.5× usualBaripāda, 10 May: 44.2 µg/m³, 1.9× usualBaripāda, 11 May: 53.2 µg/m³, 2.3× usualBaripāda, 12 May: 36.8 µg/m³, 1.6× usualBaripāda, 13 May: no readingBaripāda, 14 May: no readingByasanagarByasanagar, 7 May: 29.0 µg/m³, 1.4× usualByasanagar, 8 May: 33.0 µg/m³, 1.6× usualByasanagar, 9 May: 37.6 µg/m³, 1.8× usualByasanagar, 10 May: 39.5 µg/m³, 1.9× usualByasanagar, 11 May: 44.0 µg/m³, 2.1× usualByasanagar, 12 May: 37.2 µg/m³, 1.8× usualByasanagar, 13 May: 33.4 µg/m³, 1.6× usualByasanagar, 14 May: 34.9 µg/m³, 1.7× usual7 May891011121314
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
CuttackOdisha, India2 74.011 May17.84.2×
RairangpurOdisha, India2 64.410 May21.63.0×
KatiharBihar, India1 33.810 May13.42.5×
BaripādaOdisha, India1 53.211 May23.22.3×
ĀsansolWest Bengal, India1 64.210 May29.52.2×
ByasanagarOdisha, India1 44.011 May21.12.1×
RānīganjWest Bengal, India1 47.510 May22.82.1×
BarbilOdisha, India1 60.911 May30.32.0×

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 53 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 and West Bengal, India, May 2025: 8 cities with PM2.5 at twice their usual or more, 10 to 11 May 2025, smogrank.com/episodes/2025-05-odisha-and-west-bengal-india (accessed 2 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.