First time in India, total lockdown was announced on 22 March 2020 to stop the spread of COVID-19 and the lockdown was extended for 21 days on 24 March 2020 in the first phase. During the total lockdown, most of the sources for poor air quality were stopped in India. In this paper, we present an analysis of air quality (particulate matter-PM2.5, Air Quality Index, and tropospheric NO2) over India using ground and satellite observations. A pronounced decline in PM2.5 and AQI (Air Quality Index) is observed over Delhi, Mumbai, Hyderabad, Kolkata, and Chennai and also a declining trend was observed in tropospheric NO2 concentration during the lockdown period in 2020 compared with the same period in the year 2019. During the total lockdown period, the air quality has improved significantly which provides an important information to the cities' administration to develop rules and regulations on how they can improve air quality.

Ramesh P. Singh

Akshansha Chauhan

Air Quality Atmosphere & Health

AIR QUALITY, ATMOSPHERE, AND HEALTH 是一本多学科期刊，正如其名，说明了它所发表的广泛工作，重点关注人类活动对大气的影响及其对人类和生态健康的影响。它提供研究论文，批判性文献评论和评论，以及专门针对主题或主题的特刊。在国际范围内，该期刊提出的论文可以告知和激发全球读者群，因为所讨论的主题具有全球意义。因此，我们不鼓励提交涉及与本地问题相关的本地数据的论文。除非它们表现出广泛的适用性，否则最好将它们提交给国家或地区期刊。空气质量、大气与健康涉及酸沉淀等主题；空气中的颗粒物；空气质量监测和管理；暴露评估；风险评估;室内空气质量；大气化学；大气建模和预测；空气污染气候学；气候变化和空气质量；空气污染测量；大气影响评估；森林火灾排放；大气科学；温室气体;健康和生态影响；清洁空气技术；区域和全球变化和卫星测量。这本杂志有利于研究人员、公共卫生官员和政策制定者的不同受众，他们解决的问题需要基于大气和暴露评估科学家、流行病学家和风险评估人员的证据来解决问题。在期刊上发表文章提供了超越定义的学科领域，接触到更广泛的读者群的机会。

Air Quality, Atmosphere and Health is a multidisciplinary journal that focuses on the impact of human activities on the atmosphere and its effects on human and ecological health. The journal publishes research papers, critical literature reviews, and thematic commentaries, covering a wide range of topics. The papers presented in this journal aim to inform and inspire a global readership, as the subjects discussed have global significance. Therefore, we do not encourage the submission of papers that involve local data related to local issues unless they demonstrate broad applicability; such papers are better suited for national or regional journals. Topics covered by the journal include acid deposition, particulate matter in the air, air quality monitoring and management, exposure assessment, risk assessment, indoor air quality, atmospheric chemistry, atmospheric modeling and prediction, air pollution climatology, climate change and air quality, air pollution measurement, atmospheric impact assessment, forest fire emissions, atmospheric science, greenhouse gases, health and ecological impacts, clean air technologies, regional and global changes, and satellite measurements. This journal serves as a platform for researchers, public health officials, and policymakers, helping them address issues that require evidence from atmospheric and exposure assessment scientists, epidemiologists, and risk assessors. Publishing articles in this journal provides researchers with the opportunity to reach a broader audience beyond their defined fields.

《Air Quality, Atmosphere and Health》是一本多学科期刊，专注于人类活动对大气的影响及其对人类和生态健康的影响。期刊发表研究论文、批判性文献评论和专题评论，涵盖广泛的主题。该期刊的论文旨在告知和激发全球读者，因为讨论的主题具有全球意义。因此，我们不鼓励提交仅涉及地方性问题的数据，除非这些数据具有广泛的适用性，最好将其提交给国家或地区期刊。期刊涉及的主题包括：酸沉淀、空气中的颗粒物、空气质量监测与管理、暴露评估、风险评估、室内空气质量、大气化学、大气建模与预测、空气污染气候学、气候变化与空气质量、空气污染测量、大气影响评估、森林火灾排放、大气科学、温室气体、健康与生态影响、清洁空气技术、区域与全球变化以及卫星测量。该期刊为研究人员、公共卫生官员和政策制定者提供了一个平台，帮助他们基于大气和暴露评估的科学证据解决相关问题。在期刊上发表文章为研究者提供了接触更广泛读者群的机会。

Air Quality, Atmosphere and Health

Air Qual Atmos Health

Impact of lockdown on air quality in India during COVID-19 pandemic

A pronounced decline in PM 2.5 and AQI is observed over Delhi, Mumbai, Hyderabad, Kolkata, and Chennai and also a declining trend was observed in tropospheric NO 2 concentration during the lockdown period in 2020 compared with the same period in the year 2019.

Category	Quartile
环境科学与生态学	4
环境科学与生态学, 环境科学	4

Impact of lockdown on air quality in India during COVID-19 pandemic

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Journal Info

Category	Quartile
ENVIRONMENTAL SCIENCES	3