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NEW DELHI: Delhi recorded its worst PM2.5 levels of the twelvemonth connected Diwali and the time after, with contamination continuing to broad the metropolis good into midweek, according to a caller investigation by the Centre for Research connected Energy and Clean Air (CREA).
Despite attempts to power emissions, respective neighbourhoods reported hazardous aerial prime levels, crossing some nationalist and planetary information limits by staggering margins.The CREA survey recovered that Delhi’s mean PM2.5 attraction stood astatine 228 micrograms per cubic metre (µg/m³) connected Diwali and roseate further to 241 µg/m³ the pursuing time — levels seen lone 4 times this year, each successful January. The superior ranked arsenic the seventh astir polluted metropolis successful the state connected Tuesday, trailing Haryana’s Jind (412), Dharuhera (298), Gurgaon (290), Narnaul (266), Bahadurgarh (247), and Rajasthan’s Bhiwadi (244).
Rohtak (223), Noida (218) and Ghaziabad (207) rounded disconnected the apical ten.In immoderate areas, the contamination levels were disconnected the charts. At Nehru Nagar, hourly PM2.5 attraction skyrocketed from 679 µg/m³ astatine 9pm connected Diwali to an alarming 1,763 µg/m³ astatine 10pm — 29 times the nationalist ambient aerial prime modular and 118 times the WHO’s regular harmless line of 15 µg/m³. Fourteen of the 20 Delhi Pollution Control Committee (DPCC) monitoring stations reported hourly PM2.5 levels supra 1,000 connected Diwali night, compared to lone 5 the erstwhile year.
“However, the AQI levels look little than world due to the fact that respective CAAQMS stations maxed retired oregon recorded missing values. This reminds america to construe information cautiously and recognise that pollutant concentrations mightiness person exceeded the instruments’ detection limits. For instance, Anand Vihar reported missing information from 11pm connected 20 Oct to 3pm the adjacent day, a model erstwhile Diwali contamination typically peaks, suggesting concentrations went beyond the measurable range,” said Manoj Kumar, analyst, CREA.Two days aft Diwali, areas specified arsenic Anand Vihar continued to grounds unsafe contamination levels, with hourly PM2.5 astatine 579 µg/m³ — a flimsy betterment from 656 µg/m³ a time earlier.Health experts person warned that prolonged vulnerability to specified good particulate substance tin person superior consequences. “These particles (PM2.5) are truthful tiny they tin easy participate the bloodstream and interaction antithetic organs successful the body, starring to toxic effects.
The tinier the particle, the greater the wellness risk,” said Anumita Roy Chowdhury, enforcement director, Centre for Science and Environment (CSE).As the superior struggles nether its yearly smog blanket, attraction has again turned to imaginable solutions — including the much-debated thought of unreality seeding.
Cloud seeding: What it means and if it tin help
Yesterday, Delhi officials said the metropolis was acceptable for artificial rain. Today, the program is uncertain again. Amid these flip-flops, experts are questioning whether unreality seeding tin truly lick the capital’s contamination crisis.
Cloud seeding is simply a upwind modification method that involves releasing chemicals specified arsenic metallic iodide (AgI) oregon brackish particles into clouds to induce rainfall. These particles enactment arsenic nuclei, allowing moisture to condense into crystal crystals which tin past melt into raindrops. Aircraft usually disperse the seeding worldly depending connected the humidity and somesthesia levels.
Why the thought is connected the table
Artificial rainfall is being considered arsenic a mode to temporarily lavation pollutants retired of the aerial during Delhi’s contamination season, driven by:
- Vehicular and concern emissions
- Open country dust
- Biomass and discarded burning
- Stubble burning and stagnant wintertime air
- By inducing rain, suspended particles could beryllium removed from the ambiance for a abbreviated duration.
- The subject and its limitations
While the method has been utilized globally — from China and the UAE to Indonesia and Malaysia — experts stay sceptical astir its effectiveness successful Delhi’s adust wintertime conditions.
Cloud seeding requires moist, dense clouds similar nimbostratus, which are uncommon implicit northbound India during this period. The occidental disturbances that walk implicit the portion often bring precocious oregon short-lived clouds, unsuited for seeding, and immoderate rainfall that does signifier whitethorn evaporate earlier reaching the ground.
Global acquisition and history
- 1931 – First experiments utilizing adust crystal (CO₂) for unreality seeding successful Europe.
- 1946-47 – GE scientists Schaefer & Vonnegut place metallic iodide arsenic an effectual crystal nucleant.
- Modern usage: Countries similar China, UAE, Indonesia and Malaysia usage unreality seeding for agriculture, contamination power and lawsuit planning.
- 2023 – Pakistan conducts its archetypal artificial rainfall cognition successful Lahore with UAE assistance.
Experts counsel caution
The India Meteorological Department (IMD), the Commission for Air Quality Management (CAQM), and the Central Pollution Control Board (CPCB) person each warned that the method whitethorn person constricted interaction successful Delhi’s climate. They person besides raised questions astir the chemic and biology implications of metallic iodide dispersal.For now, experts accidental that portion unreality seeding whitethorn connection impermanent respite, it cannot regenerate semipermanent measures to curb emissions — from reducing vehicular and concern output to controlling harvest residue burning.
