9. Ireland
EPI: 78.77
CO2 emission: 7.37
PM2.5: 9.5
It seems that air pollution is also the most burning issue concerning pollution in Ireland, the number 9 on our list of least polluted countries in the world in 2018. Among the big pollutants in Ireland is burning of solid fuel. Solid fuel makes 70% of the whole air pollution and only 4% of is used as fuel, so you do the math.