Equally if barriers are identified which prevent the regulations achieving the overall objective of reducing pollution there is a need to consider if regulatory change is required.
Yn yr un modd, os yw rhwystrau’n cael eu nodi sy'n atal y rheoliadau rhag cyflawni'r amcan cyffredinol o leihau llygredd, mae angen ystyried a oes angen cyflwyno newid rheoleiddiol.