Further detail on wider evidence used to inform decisions, and how the situation will be monitored and reviewed is also set out in the relevant sections below.
Rhoddir rhagor o fanylion am y dystiolaeth ehangach a ddefnyddiwyd i lywio penderfyniadau, a sut y caiff y sefyllfa ei monitro a'i hadolygu, yn yr adrannau perthnasol isod hefyd.