Final answer:
The 'Type of material to be disinfected' is not an environmental condition to be considered when selecting a disinfectant; factors like length of exposure, pH, and temperature are crucial.
Step-by-step explanation:
The environmental condition that does NOT need to be considered when selecting a disinfectant is 'Type of material to be disinfected'. When selecting a disinfectant, important environmental factors to consider include length of exposure, pH, and temperature. These factors significantly influence the efficacy of a disinfecting agent. However, the type of material to be disinfected is more about the suitability of a disinfectant for a particular surface or material rather than an environmental condition.