Anthropogenic activities experienced a pause due to the nationwide lockdown, imposed to contain the rapid spread of COVID-19 in the third week of March 2020. The impacts of suspension of industrial activities, vehicular transport and other businesses for three months (25 March-30 June) on the environmental settings of Chennai, a coastal megacity was assessed. A significant reduction in the key urban air pollutants [PM_2.5 (66.5%), PM₁₀ (39.5%), NO₂ (94.1%), CO (29%), O₃ (45.3%)] was recorded as an immediate consequence of the reduced anthropogenic activities. Comparison of water quality of an urban river Adyar, between pre-lockdown and lockdown, showed a substantial drop in the dissolved inorganic N (47%) and suspended particulate matter (41%) during the latter period. During the pandemic, biomedical wastes in India showed an overall surge of 17%, which were predominantly plastic. FTIR-ATR analysis confirmed the polymers such as polypropylene (25.4%) and polyester (15.4%) in the personal protective equipment.

由于 2020 年 3 月第三周为遏制 COVID-19 快速传播而实施的全国封锁，人类活动暂停。工业活动、车辆运输和其他业务暂停三个月（3 月 25 日至 30 日）的影响六月）对沿海特大城市钦奈的环境设置进行了评估。直接后果是主要城市空气污染物 [PM _2.5 (66.5%)、PM ₁₀ (39.5%)、NO ₂ (94.1%)、CO (29%)、O ₃ (45.3%)] 显着减少人类活动的减少。比较城市河流阿迪亚尔封城前和封城期间的水质，封城后溶解性无机氮（47%）和悬浮颗粒物（41%）大幅下降。疫情期间，印度的生物医学废物总体激增 17%，其中主要是塑料。 FTIR-ATR 分析证实了个人防护装备中含有聚丙烯 (25.4%) 和聚酯 (15.4%) 等聚合物。