Comment on the environmental safety of the products of the reaction of ${{\text{N}}_{\text{2}}}{{\text{H}}_{\text{4}}}$ with ${{\text{O}}_{\text{2}}}$ and the reaction of ${{\text{N}}_{\text{2}}}{{\text{H}}_{\text{4}}}$ with ${{\text{F}}_{\text{2}}}$.

(${{\text{N}}_{\text{2}}}$ inert) HF (weak) acid compared to ${{\text{H}}_2}{\text{O}}$ / HF toxic / products of reactions of HF with environment/soil are harmful to environment / OWTTE;

A matter of serious concern is the number of candidates who identified nitrogen as harmful to the environment or a greenhouse gas.