
Stubble burning in Punjab, Haryana contributes only 14% of PM2.5 in Delhi-NCR: study
The HinduBased on field measurements, airmass trajectories, and particle dispersion and chemical transport model simulations, a study published in January 2025 has found that there is no linear correlation between stubble-burning events in Punjab and Haryana and fine particulate matter concentration in Delhi-NCR. The study also underscores that crop residue burning in Punjab and Haryana contributes only about 14% of PM2.5 and is therefore not a primary source of particulate matter concentration in Delhi-NCR. The authors say that the amount of biomass burned in Punjab and Haryana “does not always determine the air quality of heavily urbanised Delhi-NCR even during the core rice-stubble burning period ”. “It is clear that even in the months of peak crop residue burning season, the contributions of local industrial and other anthropogenic sources to PM2.5 in the Delhi-NCR are much greater than crop residue burning in Punjab and Haryana,” says Dr. Mangaraj. However, when GRAP-IV was lifted, PM2.5 levels surged back, underscoring how important these measures are in improving air quality.” This suggests that the local sources.” Major contributor According to Dr. Sachchida N. Tripathi from IIT Kanpur, who is not associated with the study, at 30%, the major contributor to fine particulate matter is the transport sector, followed by local biomass burning at 23%, 10% by the construction industry and road dust, while cooking and industry contribute 5-7%, and 10% is unaccounted.
History of this topic

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