SECOND GRADE

problem 3: How many unhealthy days in our area? (page 20)

problem 4: Got healthier air in Vanderburgh? (page 28)

problem 7: Who has the cleanest car? (page 51)

problem 12: What make the problem gas? (page 84)

problem 13: Who makes the problem gas? (page 88)

THIRD GRADE

problem 3: How many unhealthy days in our area? (page 20)

problem 4: Got healthier air in Vanderburgh? (page 28)

problem 7: Who has the cleanest car? (page 51)

problem 12: What make the problem gas? (page 84)

problem 13: Who makes the problem gas? (page 88)

problem 14: How big is our problem gas?(page 98)

FOURTH GRADE

problem 4: Got healthier air in Vanderburgh? (page 28)

problem 7: Who has the cleanest car? (page 51)

problem 14: How big is our problem gas?(page 98)

problem 15:Are we making more problem gas or less?(page 105)

FIFITH GRADE

problem 7: Who has the cleanest car? (page 51)

problem 15:Are we making more problem gas or less?(page 105)