Which group of people will air pollution affect the most?
a. athletes
b. college students
c. teenagers
d. people with asthma

The answer is letter D. 

People with asthma will be affected mostly by air pollution. Asthma is a condition in which an individual is having a hard time to breathe. This condition is commonly hereditary in nature but environmental factors could also contribute to its further aggravation. People with asthma often experience shortness of breath and get easily tired from performing simple activities. This is because the lungs are too weak to function and when air pollutants contribute to this, the lungs would eventually collapse causing an individual to have massive complications within the body.

They probably don't understand either 1. what the nightmare is about or 2. his anxiety and stress