When discussing Delhi Metro ridership, it's important to clarify whether the reference is to the census or audited ridership, which counts the number of unique riders per day, or to the DMRC's media reported ridership, which often includes duplicate entries & doesn't account for only unique riders.

The usual method is half of the reported ridership is actual ridership. For example the audit in 2019 found that the ridership wasn’t 5.5 million as projected but was half of that. www.hindustantimes.com/cities/delhi...