It would be mostly due to the COVID-19 outbreak with fewer cars on the road.
The Sustainable Energy Authority of Ireland says a reduction in petrol and diesel emissions so far could lead to a massive drop in CO2 emissions overall.
Fewer cars are on the road due to various COVID-19 restrictions.
It comes as the SEAI revealed just a 1.2 percent drop for 2019, but emissions for electricity use fell by just under four percent.
That's largely down to reduced electricity generation from the coal power station in Moneypoint.
Total emissions in 2019 were 22 percent lower than in 2005, but are higher than 2014, when Ireland emerged from the recession.
Wicklow Gardaí Urge Extreme Caution On Road Safety This Christmas
Wicklow Coastguard Urges Safety First for Christmas and New Year Dips
Wicklow Commuters To Benefit As New DART Trains Set To Transform Coastal Commuting
Shaping the Future of Newtownmountkennedy: A Town Team’s Vision for Growth and Community
North Wicklow GP Advice As Flu Season Hits Hard Locally