5 US States with the Lowest Per Capita CO2 Emissions

4. Maryland

Carbon Dioxide Emissions per Capita (2021): 8.5 metric tonnes of CO2/capita

Maryland ranks 4th on our list. The state emitted 8.5 metric tonnes of CO2 emissions per capita in 2021. The state’s emissions in 2021 were 9.29% higher compared to 2020.