EPA

EJSCREEN is a new online mapping tool from the Environmental Protection Agency (EPA). What makes it different than other pollution maps, though, is that it also includes census data to show the relationship between negative environmental factors and demographic indicators like low-income and minority populations. As Gizmodo reports, "The maps are color-coded to show poverty, and pollution (as measured by fine particle density). Grey is in area that’s below the 50th percentile, with the colors going up to yellow then red as the poverty (and pollution) increases." And as is clear in the animated image above, high-poverty areas like East Harlem, Washington Heights, and much of the Bronx are among the most polluted in the city.
More on the map here