Almost 2 million Digital Covid Certs have so far been issued, according to the Department of Public Expenditure and Reform.
It says 1.1 million have been sent to vaccinated people via e-mail.
While 870,000 hard copy certs have been printed and sent in the post.
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Airports across the country are welcoming a surge in passengers today.
As non-essential travel abroad resumes for the first time since the start of the pandemic.