31 Mar 2023
 | 31 Mar 2023
Status: this preprint is currently under review for the journal ESSD.

Decadal Growth in Emission Load of Major Air Pollutants in Delhi

Saroj Kumar Sahu, Poonam Mangaraj, and Gufran Beig

Abstract. Indian capital megacity Delhi is reeling under deteriorating air quality and control measures are not yielding any significant changes mainly due to a poor understanding of sources of emissions, hence priority option in mitigation planning is lacking. In this paper, we have made an attempt to develop a spatially resolved technological high-resolution gridded (~0.4 km × 0.4 km) emission inventory for eight major pollutants of the Delhi region where high-resolution activity data of all possible major and unattended minor sources are generated by organizing a mega campaign involving 100s of volunteers. It is for the first time that we are able to estimate the decadal growth in emissions of various pollutants by comparing newly developed 2020 emissions with SAFAR emissions of 2010 using the identical methodology and quantum of activity data. The estimated annual emission for PM2.5, PM10, CO, NOx, VOC, SO2, BC and OC over Delhi-NCR are estimated to be 123.8 Gg/yr, 243.6 Gg/yr, 799.0 Gg/yr, 488.9 Gg/yr, 730.0 Gg/yr, 425.8 Gg/yr, 33.6 Gg/yr, and 20.3 Gg/yr respectively for the year 2020. The decadal growth (2010–2020) in PM2.5 and PM10 are found to be marginal 31 % and 3 % respectively. The maximum growth is found to be in the transport sector followed by the industrial and other sectors. Maximum decadal growth found for pollutants BC, OC and NOx is 57 %, 34 % and 91 % respectively. The decadal shift of sectorial emissions with changing policies is examined. The complete dataset is available on Zenodo at (Sahu et al., 2023).

Saroj Kumar Sahu et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on essd-2023-90', Anonymous Referee #1, 15 Apr 2023
    • AC1: 'Reply on RC1', Saroj Kumar Sahu, 21 Apr 2023
  • RC2: 'Comment on essd-2023-90', Kanhu Charan Pattnayak, 26 Apr 2023
    • AC2: 'Reply on RC2', Saroj Kumar Sahu, 04 May 2023
      • RC3: 'Reply on AC2', Kanhu Charan Pattnayak, 09 May 2023

Saroj Kumar Sahu et al.

Data sets

Gridded Surface Emission Data for Delhi-NCR Saroj Kumar Sahu, Poonam Mangaraj, and Gufran Beig

Saroj Kumar Sahu et al.


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Short summary
The developed emission inventory identifies all the potential anthropogenic sources active in Delhi-NCR. The decadal change (2010–2020) along with the changing policies has also been illustrated to observe the modulation in the sectorial emission trend. Emission hotspots with possible source-specific mitigation strategies have also been highlighted to improve the air quality of Delhi-NCR. The provided dataset is a vital tool to air quality and chemical transport modelling studies.