Dublin has been ranked as the worst capital city in Europe for public transport.
The study by Greenpeace gave Dublin a score of just 36 out of 100 points based on affordability and simplicity in buying tickets.
Dublin was the only city which didn't have a long-term fixed-price ticket for all modes of public transport.
It noted that monthly ticket is only available for workers whose employer is signed up to the “tax saver programme”, with other passengers having to buy "monthly subscriptions for buses, trams and trains in Dublin separately".
In the absence of a multi-service monthly ticket, the research took the Leap card ticketing system into account, which caps weekly payments at €32 across public transport in Dublin.
However, the report found that regular-priced tickets are the second-highest out of all cities analysed, at €3.16 per day after the price level adjustment.
"The most expensive cities are London, Dublin, Paris and Amsterdam (adjusted with the Price Level Indices). They offer tickets for more than €2.25 per day".
Greenpeace says "among the 30 countries analysed, only three have introduced relatively affordable tickets that can be used throughout the country: Austria, Germany and Hungary.
The environmental charlity is calling on all European governments to introduce affordable 'climate tickets' for public transport.