Spatio-temporal analysis of air quality index: A case study in Delhi and Chennai city from 2013 to 2020

The Air Quality Index (AQI) is a significant tool of risk communication and reporting system. The main aim of the paper is to comparatively analysis the air quality index of both the Delhi and Chennai. The objective of the study is to compute the AQI of both the cities and to compare it. For both the cities data for the computation of the AQI are taken from the secondary source from Central Pollution Control Board (CPCB) and Tamil Nadu Control Pollution Board (TNP). It is found that in both the city main source of pollution are from both anthropogenic and natural genesis.  The pollutants which make the reading of AQI severe is emitted from the transportation sector such as emission from the vehicles, road side dust particles followed by the pollutants from the industries and construction site. In Delhi sandstorms from the desert regions during the summer season and bursting of firecrackers in diwali are responsible for shooting the AQI during March and November month respectively. During monsoon season the AQI value become less in Delhi. In Chennai the AQI value does not very much, throughout the year it remains constant with slight degradation during Diwali and Pongal celebration.&nbsp