Figure 7

Relative humidity time course for new tropical automobiles. In this figure are shown automobile trips of 5 minutes or more in closed vehicles with air conditioning. It can be seen that within 5 minutes, relative humidity is lowered to between 45% and 25%. Time 0:00 is street ambient temperature and the first interior reading is at or after 1 minute. The humidity in a new automobile was significantly lower than the street humidity at the time of the first reading after the door was closed. That these vehicles recirculated their air would be expected to contribute to contagion. N = 15.