The purpose of this experiment is to find out if ambient temperatures affects lung function. I hypothesized that cold temperatures will decrease lung function and warm temperatures will have no affect on lung function. To perform this experiment, I used a Celsius thermometer, a clock, an "Air Zone" peak flow meter, and three volunteers. First, I got one of my volunteers to blow into the peak flow meter. This is the normal lung capacity. Then, I got the same volunteer to go in a cold area for three minutes. After this specific amount of time, the volunteer blew in the peak flow meter. This is the lung capacity affected by cold temperatures. Then, I got the volunteer to go in a warm area for three minutes. The volunteer blew into the peak flow meter. This is the lung capacity affected by warm temperatures. Finally, due to hygienic reasons, I cleaned the peak flow meter with alchohol swabs. I repeated the steps for two other volunteers and recorded my results. I observed that cold temperatures decreased lung function for all of the volunteers and warm temperatures had no effect on lung function.