HOLC

Combining demographic data from the 2020 census and historical maps drawn by the HOLC, the researchers found that neighborhoods rated with a "D" had 13% higher levels of NO2 than areas labeled "A."

The study, published Wednesday in the Journal of Exposure Science & Environmental Epidemiology, says that oil drilling is a more significant source of the pollution in communities that received the lowest grade, D, and a scarlet shade of red from the HOLC.

More than 10,000 were within maps drawn by HOLC.

Gonzalez and his fellow researchers were not surprised that Los Angeles had the most oil drilling sites, 6,618, in and near maps drawn by HOLC.

Negroes were ‘dangerous’ and ‘undesirable,’ a ‘detrimental influence,’ according to HOLC’s eugenics-infused underwriting standards.