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.
Measles is a highly contagious viral disease that is spread through the air by respiratory droplets, or by coming in contact with nasal discharge/mucous of an infected person.Measles is most contagious during the three days before the rash appears.The rash usually begins around the face and neck, and works its way down the body, with increasing lesions often seen on the face and trunk. The rash lasts 3-7 days and fades from the body in the order in which it appeared.easles is a highly contagious viral disease that is spread through the air by respiratory droplets, or by coming in contact with nasal discharge/mucous of an infected person.