Yes, generators also have noise limits and going above those limits would mean that the generators are causing noise pollution.
All generators that:
Set up to 1000 KVA( Kilo-volt-ampere, electrical power unit measurement)
Manufactured or imported in India after January 1, 2005
require certification to run. Every manufacturer of a generator has to have a certification called a Type Approval and a Conformity of Production certificate which denotes that the generators are not causing excess noise. Read more here.