The best we can compare is the trading volumes on platforms that fiat money pairs such as the dollar, euro, and others.
For platforms dealing with cryptocurrencies, it is difficult to determine the accuracy of volumes based on the report provided by the platform.
Even FIAT/BTC pairs volume can be fake.
Two accounts owned by the exchange can be making faking transactions. It is a way to make a free advertisement, as many websites such as CMC will be ranking it as a high volume.
Some exchanges in Brazil did that (they broke few months later)