Hi air quality and climate researchers,
CPCB releases daily AQI Bulletins data. You can find this data for each city from 2015 to 2023 on this page -
Link.
The CSV file contains
(available) day-wise city-average AQI value, AQI category, and
conditional pollutant information and the image is a calendar plot of
the AQI values, along with the average number of stations reporting AQI
value in each year.
Github repo for parsing CPCB PDF bulletins is here:
Link