1. Some gaseous pollutants bond with water to form little droplets known as . a. Rainfall
b. Water droplets
c. Pollution
d. Aerosols

2.Which size of pollution particle is most dangerous to human health?
a. Large particles (10 micrometers wide or more)
b. Medium sized particles (3-10 micrometers wide)
c. Small particles (less than 3 micrometers wide)
d. None, because pollution is not hazardous to human health

3.Which pollutants are hazardous to human health?
a. Sulfur dioxides
b. Carbon Monoxide
c. Volatile organic compounds (VOCs)
d. All of the above