Figure 3. Spatial distribution maps of AQI dataset across Indian Territory for time series based analysis (a) pre-lockdown and (b) during the lockdown in the year 2020

From

A Tale of Air Quality Index (AQI) in India: Pre- and during the COVID-19 Pandemic

Pooja Baweja, Haritma Chopra, Pinkey B. Gandhi, Sandhya Gupta, Nisha Poddar, Sakshi Suman, Vikas Rena

Applied Ecology and Environmental Sciences. 2022, 10(7), 432-443 doi:10.12691/aees-10-7-2