How to find the hazard ratio (or hazard quotient) in aquatic environment due to several chemicals (in case we know the concentrations)?

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Nagalakshmi Radhakrishnan

hazard ratio depends toxicity of a chemical substance to the aquatic organisms calculated by

hazard ratio = hazard in the intervention group/hazard in the control group

Amila Abeynayaka

Nagalakshmi Radhakrishnan , thanks for the answer. Yes, I understand that. Is there any calculation method (software or reference document) to it?