First, do the research on previous research. The official government site should define what parameters they expect, with possible links to the studies you seek.

https://igod.gov.in/search?keyword=Exposure+Factor+for+Risk+Assessment

https://www.transportpolicy.net/standard/india-air-quality-standards/

https://aaqr.org/articles/aaqr-21-08-oa-0204

Internet search tools are amazing things! Learn to use one to improve your own research.