An Independent TD is calling for Dublin Port to be moved to Co Wexford.
Verona Murphy claims the port facilities should be relocated to Rosslare because of the levels of air pollution in parts of Dublin.
The Wexford TD pointed to a recent environmental report which found nitrogen oxide emissions in parts of the city were at risk of breaching EU limits.
The EPA report from last July said the entrance to and exit from the Dublin Port Tunnel were spots where NO2 may exceed the annual EU limit.
Deputy Murphy discussed her proposal on Newstalk Breakfast this morning.
She said: "Roll-on, roll-off traffic wouldn't be suitable in Drogheda, whereas Rosslare only utilises 40% of its capacity in roll-on, roll-off - and Dublin Port is 60% roll-on, roll-off capacity.
"Rosslare has the capacity, and Brexit's coming down the line. Seeing as Rosslare is the port that's most strategically placed, that's where it needs to be."
Deputy Murphy said that excess levels of emissions can cause health problems, and the agenda across Europe is now to clean up cities.
She explained: "Having such an offensive piece of infrastructure stuck in our major city is not a solution.
"[Cities] like Copenhagen, Oslo, Barcelona are reducing the capacity of their ports, and introducing it in a green, low-carbon friendly way... producing spaces where you have development of housing, bars and cafés."
Challenged over the fact that Rosslare is not connected by motorway to cities such as Waterford, Deputy Murphy argued: "What we're looking to here is future development.
"Growing Dublin Port is going to grow the problem.
"We also have to look at 600 acres of available land, when we're in the middle of the biggest homelessness and housing crisis we have ever seen."
She said moving the port would be a long-term project, but that moving the roll-on, roll-off traffic would be the 'easiest bit' and could be done 'immediately'.