I guess that air pollution in India does not only come from the exhausts of diesel vehicles but the problem is real. Europeans cut diesel quite a lot of slack which is why at every real-world test almost all vehicles in the test fail. And they will continue to fail as hitting those marks for real will make diesel vehicles much more expensive. Everyone who has copied this is in the same mess.
The European Union has been a horribly deadly influence on India in the time of environmental consciousness.