Table 1. Data type and sources of data collected for this research.

No.	Name type	Data source	Date acquired	File name	Filename extension
1	Nitrogen dioxide tropospheric column	http://s5phub.copernicus.eu/dhus/#/home	April 2019, December 2019, April 2020	NetCDF	.nc
2	National and State Boundary	http://diva-gis.org/data	March, 2020	Shape file (Polygon)	.shp
3	State Capital	Google Earth Pro	March, 2020	Keyhole Markup Language Zipped	Kmz/Kml