We use the ______________ to let citizens know pollution levels and health risks each day.
 Question 1 options:
 Pollution Index
 Particulate Index
 Cheese Index
 Air Quality Index
 Question 2 (1 point) 
 Once the clean air act was passed in the United States, the level of pollution from power plants ________.
 Question 2 options:
 Went up (increased)
 Went down (decreased)
 Stayed the same as before
 Question 3 (1 point) 
 True or False: Air quality is never bad in rural areas, outside of cities.
 Question 3 options:
 False
 True
 Question 4 (1 point) 
 Which of the following is a natural source of air pollution?
 Question 4 options:
 Cars
 Power Plants
 Earthquakes
 Forest fires