Unfair to blame Haryana & Punjab farmers for Delhi’s severe pollution: Ashok Khemka
Additional chief secretary Ashok Khemka has defended farmers in a note to CM Nayab Singh Saini and chief secretary Vivek Joshi, saying that while burning ‘parali' (paddy residue) negatively affects air quality and should be stopped, it is unfair to hold crop growers of Punjab and Haryana responsible for Delhi's severe air pollution. The senior IAS officer, who is ACS transport, referred to a video conference of Jan 4 under the chairmanship of the PM's advisor, Tarun Kapoor, in which the chairman of Commission for Air Quality Management (CAQM) made a presentation on the subject. The presentation was based on a Jan 2023 report by The Energy and Resources Institute (TERI), which said agricultural residue burning contributes 1% to PM 2.5 and PM10 levels in Delhi. This finding was displayed in a slide labeled ‘Sectoral Contribution of Sources of NCR to Particulate Matter'. Khemka's note, titled ‘Management of Air Pollution in NCR', was sent on Jan 10. According to the TERI report Khemka referred to, road dust contributes 42% to PM10 levels in Delhi annually while transport contributes 25%. Transport accounts for 47% of PM 2.5 emissions and road dust 20%. There is a higher contribution of dust sources to PM10 in summer (38-42%) compared to winter (23-31%). It's the same for PM 2.5 (31-34% in summer to 15% in winter). Why annual data doesn't give a clear picture However, while the ACS stresses the importance of having a strategy to contain vehicular pollution, farm fire emissions cannot be compared to vehicular or any other pollution source that is an all-year phenomenon. Farm fires are seasonal, happening within a window between Sept 1 and Nov 30. So, their share in an annual metric will always be small. Besides, during the peak season for farm fires, their share in the capital's pollution levels are much, much higher than 1%. According to the Decision Support System (DSS) for air quality management in Delhi, which has been used to monitor the contribution of farm fires to the capital's PM 2.5 levels, stubble burning's contribution touched 35% on Nov 1 last year. Every winter, air quality in Delhi-NCR plummets to hazardous levels as the airshed fills up with toxic haze which is triggered by a combination of pollutants, fog, lack of winds and other meteorological factors. Farm fires, commonly seen in north India's agricultural belt to clear tracts of land for another round of sowing after the paddy harvest, become a major compounding factor when added to local sources. Shubhansh Tiwari, research associate at Centre for Science and Environment (CSE), told TOI: "Agricultural residue burning's overall contribution is small compared to other sources as it occurs for a limited period. The issue needs to be addressed because, during the 45 days when farmers clear their fields, meteorological conditions carry the smoke into NCR. Nevertheless, road dust and vehicular emissions remain primary contributors to particulate matter in Delhi-NCR and effective management of these sources, especially during the summer months when dust levels are higher, is crucial for improving air quality. So what we need is a holistic approach that addresses all significant pollution sources."
