Identify what are some limits associated with the use of normals

First of all let me explain what normals mean in thsi context. Normals in here refers to standard values of a location using data gathered by meteorologists. Being that explained, we can say that limits associated inlude airports located outside the city so they might be differnt form the actual weather conditions in nearby cities. elevation and pressure can be determinant factors that can limit the use of normals

For you to be sure whether it is high pressure in the breathing system or to confirm the percentage of air which is taken in and out by the patient