Answer:
⇔ The vocal chord and the way the speaker use it's voice is being controlled by the air exhaled by the lungs that are later being delivered into the vocal cords and cause vibrations. If you don't inhale enough air, and feeling short breathing, you won't be releasing enough air onto the vocal chord. Thus, the voice we make are depending on the breaths that we take.
⇔ The outdoor air either be fresh or polluted. The disadvantages of speaking outdoors is inhaling the polluted air, or the common airborne diseases like the flu, cough, sneezes, and the common colds that can be passed from one organism to the other in the air.
⇔ The facility can have a poorer sound quality as people are not that close with each other, so interacting and communicating might be more difficult. The cost of hiring in the large venues are also high, and you might be nervous on speaking onto hundreds of audiences, since the venue is large, then audiences must be plenty too.
