1 .		Air pollutants are airborne particles and gases that occur in concentrations that endanger the health and well-being of organisms or disrupt the orderly function of the environment.   True  False
2 .		An important reason for a slower than expected progress in bettering air quality is related to population growth.   True  False
3 .		Mixing depths during the summer months are typically greater than during the winter months.   True  False
4 .		By significantly reducing sulfur in gasoline, an automobile's electrical system becomes more effective, and atmospheric emissions improve.   True  False
5 .		Air is never perfectly clean.   True  False
6 .		Photochemical reactions that produce many secondary pollutants are triggered by strong sunlight.   True  False
7 .		The greatest single source of the materials that cause acid rain is residential heating furnaces.   True  False
8 .		A temperature inversion will frequently increase the mixing depth of the atmosphere and aid in the dispersion of pollutants.   True  False
9 .		The quality of the air we breathe is no longer considered a serious health problem.   True  False
10 .		Rain is naturally somewhat acidic, with a pH close to 5.   True  False