3-Nitrobenzanthrone (3-nitro-7
H-benz[de]anthracen-7-one) is a
chemical compound emitted in
diesel exhaust; it is a potent
carcinogen. It produced the highest score ever reported in the
Ames test, a standard measure of the cancer-causing potential of toxic chemicals, far greater than the previous known strongest (1,8-dinitropyrene, which is also found in diesel exhaust).