After radical burst firecrackers crossed Delhi connected Deepavali night, openly flouting an existing prohibition allowing lone greenish firecrackers from 8 p.m. to 10 p.m., wide aerial contamination successful Delhi connected Tuesday (October 21, 2025) greeting was astir 15 times the bounds prescribed by the World Health Organisation (WHO), according to authoritative data.
People burst firecrackers connected Monday (October 20, 2025) nighttime earlier and aft the 8p.m. to 10 p.m. model crossed the metropolis and firecrackers different than greenish firecrackers were disposable successful the metropolis earlier Deepavali.
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The wide level of PM2.5 (a main pollutant) successful Delhi was 228 micrograms per cubic metre astatine 6 a.m. connected Tuesday (October 21, 2025), arsenic per Central Pollution Control Board (CPCB) data, which is 15.1 times the WHO’s permissible bounds of 15 micrograms per cubic metre for a 24-hour period.
Delhi was the “most polluted” large metropolis successful the satellite connected Tuesday (October 21, 2025) morning, according to IQAir’s (a Swiss aerial prime exertion company) unrecorded information for implicit 120 cities. Delhi’s AQI of 429 was the worst successful the list, followed by Lahore (260) and Karachi (182).
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The wide aerial prime of Delhi was successful the “very poor” class connected Tuesday (October 21, 2025) greeting with 4 of the 36 monitoring stations signaling “severe” aerial pollution.
Severe level aerial contamination “affects steadfast people” and “seriously impacts” those with existing diseases, according to CPCB.
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Delhi’s 24-hour mean aerial prime scale (AQI) was 356 astatine 9 a.m. connected Tuesday (October 21, 2025), arsenic per the Central Pollution Control Board’s (CPCB) data. Bawan, Burari, Jahangirpuri, and Wazirpur reeled nether “severe” aerial pollution.
An AQI betwixt 51 and 100 is “satisfactory”, 101 and 200 is termed arsenic “moderate”, 201 and 300 “poor”, 301 and 400 “very poor”, and 401 and 500 “severe”, arsenic per the CPCB.
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Several different towns and cities successful northbound India besides witnessed “very poor” aerial quality, arsenic per CPCB’s data.
Every winter, aerial contamination spikes successful Delhi-NCR and astir parts of the larger Indo-Gangetic plains (IGP) chiefly owed to meteorological factors specified little upwind velocity and driblet successful temperature, and contamination from stubble burning during October-November and bursting of firecrackers worsens it.

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