SmogRank / Episodes / India

North-eastern India, July 2025

For 3 days, from 22 to 24 July 2025, 12 cities in India had PM2.5 at least twice their usual for the time of year. The worst reading was Gaya, Bihar, India: 109.5 µg/m³ on 22 July, about 4.7× its usual 23.5.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached12in 1 country
Days322 to 24 July 2025
Worst day23 July8 cities counted
Furthest above usual6.8×Arāria

Day by day

23 July 8 cities at twice their usual or more
RājgīrAurangābādSasarāmPatnaArrahHājīpurChāpraBegusaraiBuxarMungerMuzaffarpurSiwānBhāgalpurRourkelaVaranasiMothīhāriBarbilRairangpurBettiahKatiharKeonjhargarhBelpaharBaripādaKishanganjPrayagrajShrīrāmpurBilāspurKolkataHaldiaSiliguriMaiharLucknowRānīganjSamāstipurDurgapurĀsansolGorakhpurPurniaJodaSaharsaSingrauliArāriaGayaBhelai
19 Jul2021222324252627
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

BhelaiBhelai, 19 July: 88.9 µg/m³, 6.5× usualBhelai, 20 July: 85.5 µg/m³, 6.2× usualBhelai, 21 July: 93.9 µg/m³, 6.9× usualBhelai, 22 July: 106.0 µg/m³, 7.7× usualBhelai, 23 July: 92.6 µg/m³, 6.8× usualBhelai, 24 July: 60.7 µg/m³, 4.4× usualBhelai, 25 July: no readingBhelai, 26 July: no readingBhelai, 27 July: 32.0 µg/m³, 2.3× usualJodaJoda, 19 July: 69.7 µg/m³, 2.3× usualJoda, 20 July: 86.9 µg/m³, 2.9× usualJoda, 21 July: 47.6 µg/m³, 1.6× usualJoda, 22 July: 39.1 µg/m³, 1.3× usualJoda, 23 July: 75.1 µg/m³, 2.5× usualJoda, 24 July: 30.6 µg/m³, 1.0× usualJoda, 25 July: 17.7 µg/m³, 0.6× usualJoda, 26 July: 8.1 µg/m³, 0.3× usualJoda, 27 July: 7.7 µg/m³, 0.3× usualArāriaArāria, 19 July: no readingArāria, 20 July: 243.0 µg/m³, 8.5× usualArāria, 21 July: no readingArāria, 22 July: 107.0 µg/m³, 3.7× usualArāria, 23 July: no readingArāria, 24 July: no readingArāria, 25 July: no readingArāria, 26 July: 89.0 µg/m³, 3.1× usualArāria, 27 July: 62.9 µg/m³, 2.2× usualGayaGaya, 19 July: 43.1 µg/m³, 1.8× usualGaya, 20 July: 61.2 µg/m³, 2.6× usualGaya, 21 July: 65.2 µg/m³, 2.8× usualGaya, 22 July: 109.5 µg/m³, 4.7× usualGaya, 23 July: 34.6 µg/m³, 1.5× usualGaya, 24 July: 40.0 µg/m³, 1.7× usualGaya, 25 July: 14.0 µg/m³, 0.6× usualGaya, 26 July: 23.1 µg/m³, 1.0× usualGaya, 27 July: 16.9 µg/m³, 0.7× usualGorakhpurGorakhpur, 19 July: 28.4 µg/m³, 1.6× usualGorakhpur, 20 July: 34.6 µg/m³, 2.0× usualGorakhpur, 21 July: 28.5 µg/m³, 1.6× usualGorakhpur, 22 July: 26.4 µg/m³, 1.5× usualGorakhpur, 23 July: 41.1 µg/m³, 2.4× usualGorakhpur, 24 July: 40.7 µg/m³, 2.4× usualGorakhpur, 25 July: 24.7 µg/m³, 1.4× usualGorakhpur, 26 July: 22.0 µg/m³, 1.3× usualGorakhpur, 27 July: 14.6 µg/m³, 0.8× usualSaharsaSaharsa, 19 July: 42.7 µg/m³, 1.8× usualSaharsa, 20 July: 17.7 µg/m³, 0.7× usualSaharsa, 21 July: 32.2 µg/m³, 1.4× usualSaharsa, 22 July: 66.6 µg/m³, 2.8× usualSaharsa, 23 July: 39.4 µg/m³, 1.7× usualSaharsa, 24 July: 58.5 µg/m³, 2.5× usualSaharsa, 25 July: no readingSaharsa, 26 July: 9.5 µg/m³, 0.4× usualSaharsa, 27 July: no readingPurniaPurnia, 19 July: no readingPurnia, 20 July: 12.8 µg/m³, 0.8× usualPurnia, 21 July: 28.0 µg/m³, 1.6× usualPurnia, 22 July: 40.0 µg/m³, 2.4× usualPurnia, 23 July: 29.2 µg/m³, 1.7× usualPurnia, 24 July: 30.0 µg/m³, 1.8× usualPurnia, 25 July: 16.4 µg/m³, 1.0× usualPurnia, 26 July: no readingPurnia, 27 July: no readingSamāstipurSamāstipur, 19 July: 47.0 µg/m³, 1.2× usualSamāstipur, 20 July: 49.1 µg/m³, 1.3× usualSamāstipur, 21 July: no readingSamāstipur, 22 July: no readingSamāstipur, 23 July: 79.5 µg/m³, 2.1× usualSamāstipur, 24 July: 63.4 µg/m³, 1.6× usualSamāstipur, 25 July: 39.0 µg/m³, 1.0× usualSamāstipur, 26 July: 19.4 µg/m³, 0.5× usualSamāstipur, 27 July: 45.9 µg/m³, 1.2× usualSingrauliSingrauli, 19 July: 26.2 µg/m³, 1.0× usualSingrauli, 20 July: no readingSingrauli, 21 July: 33.9 µg/m³, 1.3× usualSingrauli, 22 July: 39.4 µg/m³, 1.6× usualSingrauli, 23 July: 59.1 µg/m³, 2.3× usualSingrauli, 24 July: 76.0 µg/m³, 3.0× usualSingrauli, 25 July: 23.3 µg/m³, 0.9× usualSingrauli, 26 July: 17.3 µg/m³, 0.7× usualSingrauli, 27 July: 9.8 µg/m³, 0.4× usualĀsansolĀsansol, 19 July: 27.5 µg/m³, 1.5× usualĀsansol, 20 July: 20.9 µg/m³, 1.2× usualĀsansol, 21 July: 33.4 µg/m³, 1.9× usualĀsansol, 22 July: 23.7 µg/m³, 1.3× usualĀsansol, 23 July: 42.6 µg/m³, 2.4× usualĀsansol, 24 July: 38.6 µg/m³, 2.1× usualĀsansol, 25 July: 22.2 µg/m³, 1.2× usualĀsansol, 26 July: 13.1 µg/m³, 0.7× usualĀsansol, 27 July: 17.0 µg/m³, 0.9× usualDurgapurDurgapur, 19 July: 37.4 µg/m³, 1.9× usualDurgapur, 20 July: 25.9 µg/m³, 1.3× usualDurgapur, 21 July: 36.7 µg/m³, 1.9× usualDurgapur, 22 July: 30.7 µg/m³, 1.6× usualDurgapur, 23 July: 41.3 µg/m³, 2.2× usualDurgapur, 24 July: 42.0 µg/m³, 2.2× usualDurgapur, 25 July: 22.2 µg/m³, 1.2× usualDurgapur, 26 July: 18.3 µg/m³, 1.0× usualDurgapur, 27 July: 20.9 µg/m³, 1.1× usualRānīganjRānīganj, 19 July: 23.7 µg/m³, 1.4× usualRānīganj, 20 July: 18.4 µg/m³, 1.1× usualRānīganj, 21 July: 28.8 µg/m³, 1.7× usualRānīganj, 22 July: 24.2 µg/m³, 1.4× usualRānīganj, 23 July: 34.6 µg/m³, 2.0× usualRānīganj, 24 July: 35.0 µg/m³, 2.0× usualRānīganj, 25 July: 20.0 µg/m³, 1.2× usualRānīganj, 26 July: 17.2 µg/m³, 1.0× usualRānīganj, 27 July: 17.2 µg/m³, 1.0× usual19 Jul2021222324252627
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
ArāriaBihar, India1 243.020 July28.78.5×
BhelaiChhattisgarh, India2 106.022 July13.77.7×
GayaBihar, India1 109.522 July23.54.7×
SingrauliMadhya Pradesh, India2 76.024 July25.43.0×
JodaOdisha, India1 86.920 July30.32.9×
SaharsaBihar, India2 66.622 July23.72.8×
GorakhpurUttar Pradesh, India2 41.123 July17.32.4×
ĀsansolWest Bengal, India2 42.623 July18.02.4×
PurniaBihar, India1 40.022 July17.02.4×
DurgapurWest Bengal, India2 42.024 July19.22.2×
SamāstipurBihar, India1 79.523 July38.62.1×
RānīganjWest Bengal, India2 35.024 July17.12.0×

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 30 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, North-eastern India, July 2025: 12 cities with PM2.5 at twice their usual or more, 22 to 24 July 2025, smogrank.com/episodes/2025-07-north-eastern-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.