An Invitation to Health 16th Edition by Dianne Hales

تمرين 3

Which of the following statements about air pollution is false ?
A) More than 80 percent of the people in the United States live in counties with unhealthy levels of ozone or particle pollution.
B) Ozone in the upper atmosphere protects us from harmful ultraviolet radiation from the sun, but in the lower atmosphere, it is a harmful air pollutant.
C) Air pollution can cause the same types of respiratory health problems as smoking.
D) Particle pollution diminishes lung function and increases the severity of asthma attacks.