A hydroxynaphthoquinone that has antimicrobial activity and is being used in antimalarial protocols. [PubChem]
The T-value in the score for hazard refers to chronic toxicity. Underlying data for P, B and T comes from Fass.se, see below. Fass environmental information for atovaquone, Malarone (atovaquone, proguanil) (downloaded 2018-06-26) Hazard Persistence: It can not be ruled out that atovaquone is persistence because data is missing. Bioaccumulation: Log Kow = 5.31 at pH 7 Chronic toxicity: There is NOEC for 8 days for 1 trophic level: crustacean 0.083 microg/L. PBT/vPvB assessment "The appropriate degradation data are not available to assign PBT/vPvB criteria." Risk "Risk of environmental impact of atovaquone cannot be excluded, since there is not sufficient ecotoxicity data available."