The sale of turf, smoky coal, and wet wood in shops or online has been banned from today.
Minister for the Environment, Climate and Communications Eamon Ryan signed the new regulations last week.
People with turf-cutting rights will still be able to cut turf for their own use and may gift or sell turf, once it is not sold through retail premises or online.
The department said: "The primary focus of these regulations is on improving air quality and improving people's health chances and outcomes, by restricting the retail, online and commercial sale of smoky fuels, including smoky coal, turf and wet wood.
"These fuels are proven to be a major contributor to air pollution in Ireland."