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| PM2.5 diminution and haze events over Delhi during the COVID-19 lockdown period: an interplay between the baseline pollution and meteorology | |
| Dhaka, Surendra K.1; Kumar, Vinay1; Panwar, Vivek1; Chetna1; Dimri, A. P.2; Singh, Narendra3; Patra, Prabir K.4; Takigawa, Masayuki4; Matsumi, Yutaka5; Nakayama, Tomoki6; Yamaji, Kazuyo7; Kajino, Mizuo8; Misra, Prakhar9; Hayashida, Sachiko9,10 | |
| 2020-08 | |
| 发表期刊 | SCIENTIFIC REPORTS
 |
| ISSN | 2045-2322 |
| 摘要 | Delhi, a tropical Indian megacity, experiences one of the most severe air pollution in the world, linked with diverse anthropogenic and biomass burning emissions. First phase of COVID-19 lockdown in India, implemented during 25 March to 14 April 2020 resulted in a dramatic near-zeroing of various activities (e.g. traffic, industries, constructions), except the "essential services". Here, we analysed variations in the fine particulate matter (PM2.5) over the Delhi-National Capital Region. Measurements revealed large reductions (by 40-70%) in PM2.5 during the first week of lockdown (25-31 March 2020) as compared to the pre-lockdown conditions. However, O-3 pollution remained high during the lockdown due to non-linear chemistry and dynamics under low aerosol loading. Notably, events of enhanced PM2.5 levels (300-400 mu g m(-3)) were observed during night and early morning hours in the first week of April after air temperatures fell close to the dew-point (similar to 15-17 degrees C). A haze formation mechanism is suggested through uplifting of fine particles, which is reinforced by condensation of moisture following the sunrise. The study highlights a highly complex interplay between the baseline pollution and meteorology leading to counter intuitive enhancements in pollution, besides an overall improvement in air quality during the COVID-19 lockdown in this part of the world. |
| DOI | 10.1038/s41598-020-70179-8 |
| WOS关键词 | AIR-QUALITY ; INDIA ; SENSITIVITY ; EMISSIONS ; PARTICLES ; MEGACITY ; IMPACT ; OZONE ; VOCS |
| WOS研究方向 | Science & Technology - Other Topics |
| WOS类目 | Multidisciplinary Sciences |
| 出版者 | NATURE RESEARCH |
| 引用统计 | |
| 文献类型 | 期刊论文 |
| 专题 | 新冠肺炎 循证社会科学证据集成 |
| 作者单位 | 1.Univ Delhi; 2.Jawaharlal Nehru Univ; 3.Aryabhatta Res Inst Observat Sci ARIES; 4.Japan Agcy Marine Earth Sci & Technol JAMSTEC; 5.Nagoya Univ; 6.Nagasaki Univ; 7.Kobe Univ; 8.Japan Meteorol Agcy; 9.Res Inst Humanity & Nat; 10.Nara Womens Univ |
| 推荐引用方式 GB/T 7714 | Dhaka, Surendra K.,Kumar, Vinay,Panwar, Vivek,et al. PM2.5 diminution and haze events over Delhi during the COVID-19 lockdown period: an interplay between the baseline pollution and meteorology[J]. SCIENTIFIC REPORTS,2020. |
| APA | Dhaka, Surendra K..,Kumar, Vinay.,Panwar, Vivek.,Chetna.,Dimri, A. P..,...&Hayashida, Sachiko.(2020).PM2.5 diminution and haze events over Delhi during the COVID-19 lockdown period: an interplay between the baseline pollution and meteorology.SCIENTIFIC REPORTS. |
| MLA | Dhaka, Surendra K.,et al."PM2.5 diminution and haze events over Delhi during the COVID-19 lockdown period: an interplay between the baseline pollution and meteorology".SCIENTIFIC REPORTS (2020). |
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