SmogRank / Episodes / India

Bihar, India, February 2025

For 4 days, from 19 to 22 February 2025, 8 cities in India had PM2.5 at least twice their usual for the time of year. The worst reading was Rājgīr, Bihar, India: 162.0 µg/m³ on 20 February, about 4.9× its usual 33.2.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached8in 1 country
Days419 to 22 February 2025
Worst day20 February5 cities counted
Furthest above usual4.9×Rājgīr

Day by day

20 February 5 cities at twice their usual or more
HājīpurPatnaSamāstipurBegusaraiChāpraArrahMungerSaharsaMothīhāriSiwānBettiahPurniaKatiharArāriaKathmanduĀsansolRānīganjVaranasiGorakhpurKishanganjDurgapurSingrauliSiliguriPrayagrajGangtokMuzaffarpurGayaBihār SharīfBuxarBhāgalpurAurangābādSasarāmRājgīr
16 Feb171819202122232425
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

RājgīrRājgīr, 16 February: no readingRājgīr, 17 February: no readingRājgīr, 18 February: no readingRājgīr, 19 February: 131.0 µg/m³, 3.9× usualRājgīr, 20 February: 162.0 µg/m³, 4.9× usualRājgīr, 21 February: 110.0 µg/m³, 3.3× usualRājgīr, 22 February: 66.8 µg/m³, 2.0× usualRājgīr, 23 February: 54.5 µg/m³, 1.6× usualRājgīr, 24 February: no readingRājgīr, 25 February: no readingSasarāmSasarām, 16 February: no readingSasarām, 17 February: no readingSasarām, 18 February: no readingSasarām, 19 February: 99.3 µg/m³, 3.7× usualSasarām, 20 February: no readingSasarām, 21 February: no readingSasarām, 22 February: 106.0 µg/m³, 4.0× usualSasarām, 23 February: 87.2 µg/m³, 3.3× usualSasarām, 24 February: no readingSasarām, 25 February: no readingBihār SharīfBihār Sharīf, 16 February: no readingBihār Sharīf, 17 February: no readingBihār Sharīf, 18 February: no readingBihār Sharīf, 19 February: 88.3 µg/m³, 2.2× usualBihār Sharīf, 20 February: 85.1 µg/m³, 2.1× usualBihār Sharīf, 21 February: no readingBihār Sharīf, 22 February: 61.8 µg/m³, 1.5× usualBihār Sharīf, 23 February: 55.2 µg/m³, 1.4× usualBihār Sharīf, 24 February: no readingBihār Sharīf, 25 February: no readingBhāgalpurBhāgalpur, 16 February: no readingBhāgalpur, 17 February: no readingBhāgalpur, 18 February: no readingBhāgalpur, 19 February: 72.3 µg/m³, 2.0× usualBhāgalpur, 20 February: 70.5 µg/m³, 2.0× usualBhāgalpur, 21 February: 70.3 µg/m³, 2.0× usualBhāgalpur, 22 February: 85.3 µg/m³, 2.4× usualBhāgalpur, 23 February: 57.9 µg/m³, 1.6× usualBhāgalpur, 24 February: 51.5 µg/m³, 1.5× usualBhāgalpur, 25 February: 58.2 µg/m³, 1.6× usualGayaGaya, 16 February: no readingGaya, 17 February: no readingGaya, 18 February: no readingGaya, 19 February: 64.4 µg/m³, 1.4× usualGaya, 20 February: 93.4 µg/m³, 2.1× usualGaya, 21 February: 77.4 µg/m³, 1.7× usualGaya, 22 February: 73.5 µg/m³, 1.6× usualGaya, 23 February: 51.6 µg/m³, 1.1× usualGaya, 24 February: 44.6 µg/m³, 1.0× usualGaya, 25 February: 63.8 µg/m³, 1.4× usualAurangābādAurangābād, 16 February: no readingAurangābād, 17 February: no readingAurangābād, 18 February: no readingAurangābād, 19 February: 41.8 µg/m³, 1.8× usualAurangābād, 20 February: 64.5 µg/m³, 2.8× usualAurangābād, 21 February: 59.3 µg/m³, 2.5× usualAurangābād, 22 February: 53.9 µg/m³, 2.3× usualAurangābād, 23 February: no readingAurangābād, 24 February: no readingAurangābād, 25 February: no readingMuzaffarpurMuzaffarpur, 16 February: no readingMuzaffarpur, 17 February: no readingMuzaffarpur, 18 February: no readingMuzaffarpur, 19 February: 107.2 µg/m³, 1.9× usualMuzaffarpur, 20 February: 66.9 µg/m³, 1.2× usualMuzaffarpur, 21 February: 115.0 µg/m³, 2.0× usualMuzaffarpur, 22 February: 43.9 µg/m³, 0.8× usualMuzaffarpur, 23 February: 44.7 µg/m³, 0.8× usualMuzaffarpur, 24 February: 69.9 µg/m³, 1.2× usualMuzaffarpur, 25 February: 85.2 µg/m³, 1.5× usualBuxarBuxar, 16 February: no readingBuxar, 17 February: no readingBuxar, 18 February: no readingBuxar, 19 February: 83.7 µg/m³, 1.9× usualBuxar, 20 February: 69.4 µg/m³, 1.5× usualBuxar, 21 February: 104.0 µg/m³, 2.3× usualBuxar, 22 February: 77.6 µg/m³, 1.7× usualBuxar, 23 February: 65.6 µg/m³, 1.5× usualBuxar, 24 February: 67.3 µg/m³, 1.5× usualBuxar, 25 February: no reading16 Feb171819202122232425
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
RājgīrBihar, India4 162.020 February33.24.9×
SasarāmBihar, India2 106.022 February26.84.0×
AurangābādBihar, India3 64.520 February23.32.8×
BhāgalpurBihar, India3 85.322 February35.32.4×
BuxarBihar, India1 104.021 February45.02.3×
Bihār SharīfBihar, India2 88.319 February39.92.2×
GayaBihar, India1 93.420 February45.32.1×
MuzaffarpurBihar, India1 115.021 February56.92.0×

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 54 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, India, February 2025: 8 cities with PM2.5 at twice their usual or more, 19 to 22 February 2025, smogrank.com/episodes/2025-02-bihar-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.