SmogRank / Episodes / India

North-western India, 1 to 4 April 2025

For 4 days, from 1 to 4 April 2025, 9 cities in India had PM2.5 at least twice their usual for the time of year. The worst reading was Loni, Uttar Pradesh, India: 271.0 µg/m³ on 2 April, about 2.7× its usual 100.0.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached9in 1 country
Days41 to 4 April 2025
Worst day2 April7 cities counted
Furthest above usual8.7×Rishīkesh

Day by day

2 April 7 cities at twice their usual or more
Charkhi DādriBhiwadiAlwarJhunjhunūnGurugramNajafgarhAya NagarDera MāndiBawānaNarelaDelhiFaridabadNoidaBāghpatSīkarChūruDausaGreater NoidaJaipurVrindāvanBharatpurKhurjaHāpurBulandshahrMeerutKarauliMuzaffarnagarAgraTonkPatiālaDhaulpurAjmerBathindaFīrozābādGobindgarhKhannaMohaliChandigarhMorādābādNāgaurLudhianaDehradunGwaliorBaddiBūndiBikanerKotaBārānJalandharBareillyBhilwaraNandriJodhpurPāliRājsamandKanpurJalorSawai MadhopurGhāziābādLoniHanumāngarhSri GanganagarJhānsiDādriRoparRishīkesh
29 Mar30311 Apr234567
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

Sri GanganagarSri Ganganagar, 29 March: 46.3 µg/m³Sri Ganganagar, 30 March: 42.6 µg/m³Sri Ganganagar, 31 March: 53.7 µg/m³Sri Ganganagar, 1 April: 82.4 µg/m³, 2.8× its usual 29.9Sri Ganganagar, 2 April: 69.8 µg/m³, 2.3× its usual 30.1Sri Ganganagar, 3 April: 55.9 µg/m³Sri Ganganagar, 4 April: 40.2 µg/m³Sri Ganganagar, 5 April: 59.6 µg/m³Sri Ganganagar, 6 April: 72.0 µg/m³Sri Ganganagar, 7 April: 49.5 µg/m³RoparRopar, 29 March: no readingRopar, 30 March: no readingRopar, 31 March: no readingRopar, 1 April: 76.0 µg/m³, 4.5× its usual 16.8Ropar, 2 April: 70.2 µg/m³, 4.7× its usual 15.0Ropar, 3 April: 70.3 µg/m³, 5.7× its usual 12.3Ropar, 4 April: 63.7 µg/m³, 5.7× its usual 11.1Ropar, 5 April: 61.1 µg/m³Ropar, 6 April: 58.7 µg/m³Ropar, 7 April: 76.6 µg/m³HanumāngarhHanumāngarh, 29 March: 69.9 µg/m³Hanumāngarh, 30 March: 75.3 µg/m³Hanumāngarh, 31 March: 61.5 µg/m³Hanumāngarh, 1 April: 74.0 µg/m³, 2.8× its usual 26.5Hanumāngarh, 2 April: 58.4 µg/m³, 2.1× its usual 27.7Hanumāngarh, 3 April: 48.8 µg/m³Hanumāngarh, 4 April: 50.1 µg/m³Hanumāngarh, 5 April: 68.0 µg/m³Hanumāngarh, 6 April: 51.2 µg/m³Hanumāngarh, 7 April: 50.4 µg/m³RishīkeshRishīkesh, 29 March: 36.9 µg/m³Rishīkesh, 30 March: 25.4 µg/m³Rishīkesh, 31 March: 30.7 µg/m³Rishīkesh, 1 April: 29.0 µg/m³, 5.8× its usual 1.2Rishīkesh, 2 April: 43.6 µg/m³, 8.7× its usual 1.2Rishīkesh, 3 April: 41.0 µg/m³, 8.2× its usual 1.2Rishīkesh, 4 April: 37.9 µg/m³, 7.6× its usual 1.2Rishīkesh, 5 April: 42.4 µg/m³Rishīkesh, 6 April: 42.6 µg/m³Rishīkesh, 7 April: 38.5 µg/m³LoniLoni, 29 March: 166.0 µg/m³Loni, 30 March: 159.0 µg/m³Loni, 31 March: 172.0 µg/m³Loni, 1 April: 188.0 µg/m³Loni, 2 April: 271.0 µg/m³, 2.7× its usual 100.0Loni, 3 April: 263.0 µg/m³, 2.6× its usual 101.0Loni, 4 April: 248.0 µg/m³, 2.4× its usual 103.0Loni, 5 April: no readingLoni, 6 April: 198.0 µg/m³Loni, 7 April: 121.0 µg/m³DādriDādri, 29 March: 44.2 µg/m³Dādri, 30 March: 96.4 µg/m³Dādri, 31 March: 94.5 µg/m³Dādri, 1 April: 111.0 µg/m³Dādri, 2 April: 160.0 µg/m³, 2.4× its usual 66.4Dādri, 3 April: 221.0 µg/m³, 3.3× its usual 66.8Dādri, 4 April: 196.0 µg/m³, 2.9× its usual 68.6Dādri, 5 April: 122.0 µg/m³Dādri, 6 April: no readingDādri, 7 April: 243.0 µg/m³GhāziābādGhāziābād, 29 March: 32.2 µg/m³Ghāziābād, 30 March: 31.6 µg/m³Ghāziābād, 31 March: 39.6 µg/m³Ghāziābād, 1 April: 51.9 µg/m³Ghāziābād, 2 April: 160.0 µg/m³, 2.6× its usual 62.1Ghāziābād, 3 April: no readingGhāziābād, 4 April: 136.0 µg/m³, 2.0× its usual 67.0Ghāziābād, 5 April: 81.9 µg/m³Ghāziābād, 6 April: 98.8 µg/m³Ghāziābād, 7 April: 128.0 µg/m³JhānsiJhānsi, 29 March: 34.8 µg/m³Jhānsi, 30 March: 34.6 µg/m³Jhānsi, 31 March: 41.9 µg/m³Jhānsi, 1 April: 38.3 µg/m³Jhānsi, 2 April: 44.2 µg/m³Jhānsi, 3 April: 51.7 µg/m³Jhānsi, 4 April: 68.0 µg/m³, 3.3× its usual 20.5Jhānsi, 5 April: 92.8 µg/m³Jhānsi, 6 April: 99.3 µg/m³Jhānsi, 7 April: 74.2 µg/m³Sawai MadhopurSawai Madhopur, 29 March: 36.4 µg/m³Sawai Madhopur, 30 March: 47.2 µg/m³Sawai Madhopur, 31 March: 50.7 µg/m³Sawai Madhopur, 1 April: 44.2 µg/m³Sawai Madhopur, 2 April: 44.9 µg/m³Sawai Madhopur, 3 April: 54.3 µg/m³Sawai Madhopur, 4 April: 63.7 µg/m³, 2.1× its usual 30.8Sawai Madhopur, 5 April: 65.9 µg/m³Sawai Madhopur, 6 April: 66.2 µg/m³Sawai Madhopur, 7 April: 64.4 µg/m³29 Mar30311 Apr234567
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
RishīkeshUttarakhand, India4 43.62 April1.28.7×
RoparPunjab, India4 76.01 April16.84.5×
DādriUttar Pradesh, India3 221.03 April66.83.3×
JhānsiUttar Pradesh, India1 68.04 April20.53.3×
Sri GanganagarRajasthan, India2 82.41 April29.92.8×
HanumāngarhRajasthan, India2 74.01 April26.52.8×
LoniUttar Pradesh, India3 271.02 April100.02.7×
GhāziābādUttar Pradesh, India2 160.02 April62.12.6×
Sawai MadhopurRajasthan, India1 63.74 April30.82.1×

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 48 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-western India, 1 to 4 April 2025: 9 cities with PM2.5 at twice their usual or more, 1 to 4 April 2025, smogrank.com/episodes/2025-04-01-north-western-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.