There are four main types of air pollution sources: mobile sources â such as cars, buses, planes, trucks, and trains stationary sources â such as power plants, oil refineries, industrial facilities, and factories
Incubation Period: Average 9-10 days. Period of Communicability: Highly communicable in the early phase and at the beginning of the paroxysmal cough stage (first 2 weeks). The child is no longer contagious after 5 days of treatment.
Individuals with mono tend to be most contagious during the incubation period â the four to six weeks before they get sick â and during the acute phases of their illness. Some people may even shed Epstein-Barr virus when they are no longer sick.