1. What are the changes made to the Metro coaches in the Delhi Metro by DMRC to combat COVID-19.
2. What is the intention of these changes. Is it to bring in more fresh air
3. What is the mechanism used to bring in the fresh air.
4. Is the air filtered before it is made to enter the coaches. If yes, what is the specification of the filter and what is the least count (in microns) of the filters (i.e: the minimum size of particle it can filter).
5. In the case of the underground segment of the metro, what are the precautions that the fresh air of the tunnel meets the fresh air standards of normal outdoor fresh air.
6. Has there been any evaluative study done to actually check the result of this new arrangement. If yes, please share study report.