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| Assessment of Air Quality Changes in the Four Metropolitan Cities of India during COVID-19 Pandemic Lockdown | |
| Bedi, Jasbir Singh; Dhaka, Pankaj; Vijay, Deepthi; Aulakh, Rabinder Singh; Gill, Jatinder Paul Singh | |
| 2020-10 | |
| 发表期刊 | AEROSOL AND AIR QUALITY RESEARCH
 |
| ISSN | 1680-8584 |
| EISSN | 2071-1409 |
| 摘要 | In view of emerging threat of COVID-19 pandemic, stringent lockdown measures have been implemented in India since 25th March, 2020. The present study aims to assess the changes in air quality before and during lockdown in the four major metropolitan cities of India viz., Delhi, Mumbai, Kolkata and Chennai. The data on major air quality parameters and meteorological parameters was collected for 15 days before lockdown (i.e., March 10th-March 24th, 2020) and 15 days after implementation of lockdown (25th March-April 8th, 2020). The lockdown measures reflected a significant reduction in air pollutants, most significant fall was estimated for NO2 (29.3-74.4%) while the least reduction was noticed for SO2. On the contrary, levels of ground level ozone were found to be increased (except in Mumbai), could be related to the lower utilization of O-3 owing to decrease of NOx in the environment. Since, the lockdown period has been extended, therefore further reduction of most pollutants is expected. Among the various metrological parameters, significant increase in diurnal temperature was observed at Delhi, Kolkata and Mumbai, however relative humidity has changed significantly only in Mumbai. In the absence of any major violent meteorological phenomena in India during recent months the significant difference in air quality parameters could be majorly attributed to the effect of lockdown measures. However, the regional differences may be because of the local emission of pollutants and the prevailing effects of secondary pollutants. These observations highlight the contribution of anthropogenic sources in air pollution, therefore, sustainable polices for mitigation of air pollution are essential in India. |
| 关键词 | Air Pollution Air Quality COVID-19 India Lockdown Metropolitan cities |
| DOI | 10.4209/aaqr.2020.05.0209 |
| WOS关键词 | URBAN AREA ; POLLUTION ; OZONE ; REGION ; IMPACT ; EVENT |
| WOS研究方向 | Environmental Sciences & Ecology |
| WOS类目 | Environmental Sciences |
| 出版者 | TAIWAN ASSOC AEROSOL RES-TAAR |
| 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 | Guru Angad Dev Vet & Anim Sci Univ |
| 推荐引用方式 GB/T 7714 | Bedi, Jasbir Singh,Dhaka, Pankaj,Vijay, Deepthi,et al. Assessment of Air Quality Changes in the Four Metropolitan Cities of India during COVID-19 Pandemic Lockdown[J]. AEROSOL AND AIR QUALITY RESEARCH,2020. |
| APA | Bedi, Jasbir Singh,Dhaka, Pankaj,Vijay, Deepthi,Aulakh, Rabinder Singh,&Gill, Jatinder Paul Singh.(2020).Assessment of Air Quality Changes in the Four Metropolitan Cities of India during COVID-19 Pandemic Lockdown.AEROSOL AND AIR QUALITY RESEARCH. |
| MLA | Bedi, Jasbir Singh,et al."Assessment of Air Quality Changes in the Four Metropolitan Cities of India during COVID-19 Pandemic Lockdown".AEROSOL AND AIR QUALITY RESEARCH (2020). |
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