Environmental injustice and inequality in residential outdoor NO₂ concentrations for US regions, states, counties and urban areas.

<p>The left column shows differences in population-weighted mean NO₂ concentrations between low-income nonwhites (LIN) and high-income whites (HIW), with larger positive differences (red colors) indicating higher injustice (larger concentration difference between LIN and HIW). The right column shows the Atkinson Index, with higher values indicating greater inequality.