In order to determine if you are using the proper amount of sanitizer in a solution, it is best to check it with the use of test strips or with concentration techniques that will help you in determining if you have the proper amount. It is also best to change if often in order to have the best result and correct or reliable amount.
I'd say true, The body heat index is Heat is removed from the body by evaporation of that sweat. to sweat you have to be active, meaning being outside.