The environmental justice movement has developed to address inequalities in the distribution of environmental hazards and benefits. Transportation and resulting pollution have a disproportionate impact on communities that are low-income, minority, or immigrant. As a result, these communities also bear the burden of excess adverse health effects. Measurement of linkages may be difficult due to correlations between potential causal factors, including air pollution and lower socioeconomic status, but care should be taken to conduct sound studies of associations. Local context is key to understanding how disparities can change over time as populations move and adapt to the built environment. Solutions exist that can reduce inequalities and should be promoted. Read more about Senior Fellow Christina H. Fuller.