Mother Jones: Earlier this month, environmental scientists at the University of Minnesota came out with a startling nationwide study showing that different demographic groups are exposed to drastically different amounts of air pollution each year. The study overlaid U.S. Census data with exposure levels of a pollutant called nitrogen dioxide, or NO2, which is created by combustion in vehicles and power plants. The results: Each year, people of color are exposed to 46 percent more NO2 than white people.
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