See AAIU Report No:2010-002
Relevant parts
"An IAA document titled “Procedures for Reduced and Low Visibility Operations at
Dublin Airport” sets out the ATC and associated procedures to be followed during
periods of reduced or low visibility. The DAA has an equivalent manual, Airport
Direction 16, “Procedures for Reduced and Low Visibility Operations”."
And
"The document states that LVPs shall be initiated by the Station Manager if visibility
is 1,000 m or less and forecast to deteriorate significantly, or the cloud ceiling is
300 ft or less. LVPs shall be enforced when the IRVR is 550 m or less (or if the
IRVR is unserviceable when the Met Visibility is 800 m or less) and/or the cloud
ceiling is 200 ft or less."