If one were to design a tunnel, there would be a need to address the issue of ventilation, as well as exhaust. The accounting would be for:
(a) Vehicular emissions
(b) Human respiration
(c) Oxygen requirement computation for vehicles and humans
Where can I find
(i) Standards for emissions for vehicles, specifically in India, used as in 2018
(ii) Standard for emissions for humans.
(iii) Computations of oxygen and other requirement for combustion and respiration..
(iv) Any other factor if omitted.
Have a look at the publications of PIARC at https://www.piarc.org/en/ >virtual library > search a publication.
Oxygen is not an issue during normal ventilation. It is all about CO, NOx and visibility (particles). There is no specific data for India, but you can derive the data from the technology standards defined in the report given below.
Your question about "any other factor if omitted" leads to the suggestion to get a tunnel ventilation designer and not re-invent the technology from scratch.
This report will provide the vehicle emission factors:
https://www.piarc.org/en/order-library/16636-en-Road%20tunnels:%20vehicle%20emissions%20and%20air%20demand%20for%20ventilation.htm
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