Fig. 5

Annual onroad emissions on all road segments for 2014, normalized to unit length. Interstates and major arterial roadways appear in red and orange with more than 1 t C m⁻¹ year⁻¹, while roads in the downtown core of Baltimore generally had emissions of 0.1 to 1 t C m⁻¹ year⁻¹. Less densely populated parts of the county in the north and along the eastern and western edges had many roads with less than 0.1 t C m⁻¹ year⁻¹. This map was made in R