Sort:  

3/ Therefore in such cases, the call for real improvement must emerge from the society and then becomes a strong political resolution. Without a bottom-up approach, you can not solve such a crisis.

The society has a significant role.

Thank you for your quality comments

1/ The policy provision from any Govt has a limitation and it can not work beyond a certain point.

2/ Think about this case, which is Air Quality, at best it can bring a policy where the emitters are penalized or something like that but on a net basis it does little to the overall spread of ambient air.

4/ It also depends on the collective awareness and socio-economic range of society.

You're very correct.
The society also has its role