Preprints
https://doi.org/10.5194/egusphere-2024-803
https://doi.org/10.5194/egusphere-2024-803
19 Apr 2024
 | 19 Apr 2024
Status: this preprint is open for discussion and under review for Atmospheric Chemistry and Physics (ACP).

Observed improvement in air quality in Delhi during 2011–2021: Impact of mitigation measures

Yesobu Yarragunta, Latha Radhadevi, Aditi Rathod, Siddhartha Singh, and Murthy Bandaru

Abstract. Assessing long-term air quality trends helps evaluate the effectiveness of adopted air pollution control policies. A decade of SAFAR observations revealed that the trend of particulate matter (PM2.5 and PM10) in Delhi shows a reduction of 2.98 ± 0.53 µg/m3/y (4.91 ± 1.01 µg/m3/y) or overall 29 % (23.7 %) reduction between 2011 and 2021 while vehicles almost doubled but with the implementation of cleaner technologies and stricter industrial regulation. Seasonal negative trends of pre-monsoon (March-April-May; -3.43 ± 1.02 µg/m3/y) and post-monsoon (October–November; -4.51 ± 1.59 µg/m3/y) are relatively higher. The role of trends in dust storms, fire counts and annual rainy days are also discussed. The contribution of meteorology to the trend is estimated using WRF-Chem simulation of PM2.5 for October when maximum stubble burning occurs and gets transported to Delhi. The model is run with the meteorological initial conditions of 2018, 2015, and 2011 while keeping the emissions of 2018 with identical model configuration and found that meteorology contributed 9.8 % in October, while the observed decline in PM2.5 is 35 % (best fit) and 25 % (value). The study identifies the governmental control measures at various levels and green initiatives as the significant contributors to air quality improvement during 2011–2021.

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Yesobu Yarragunta, Latha Radhadevi, Aditi Rathod, Siddhartha Singh, and Murthy Bandaru

Status: open (until 31 May 2024)

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  • RC1: 'Comment on egusphere-2024-803', Anonymous Referee #2, 15 May 2024 reply
  • RC2: 'Comment on egusphere-2024-803', Anonymous Referee #1, 15 May 2024 reply
Yesobu Yarragunta, Latha Radhadevi, Aditi Rathod, Siddhartha Singh, and Murthy Bandaru
Yesobu Yarragunta, Latha Radhadevi, Aditi Rathod, Siddhartha Singh, and Murthy Bandaru

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Short summary
Climatology of particulate matter (PM2.5) observations in Delhi (2011–2021) indicates a decrease in annual mean PM2.5 by 29 %, reduction notably evident since 2016. Dust storms, rainy days, crop residue burning, land use changes apparently have negligible effect on this trend. A model study quantifies the weather influence as 10 % in post monsoon season with steepest decline. It is inferred that the policy implementation of control bodies to curb air pollution has led to air quality improvement.