The Biden administration has dropped its civil rights investigation into whether air pollution regulators discriminated against Black communities in an industrial section of Louisiana known as “Cancer Alley.” Some 200 petrochemical plants span the majority-Black region over an 80-mile stretch of the Mississippi River. On Tuesday, the Environmental Protection Agency said in a court filing it had uncovered “no finding of discrimination or other violation” of the Civil Rights Act of 1964 — that’s despite initial findings that Louisiana environmental and health officials failed to provide accurate information to residents about airborne emissions of chloroprene, a hazardous chemical linked to lung and liver cancer.