Divide the list into Visible and Invisible air pollutants. Discuss the implications both have on living things. Divide the class into groups. Each student must keep a record of their findings. Smear petroleum jelly on the outside of the small jar. Put the small jar inside the larger jar. Decide as a class on several places in and around the school where students think visible air pollution is likely to occur. Each group should have a different place to test. Students should make predictions about which area will have more.
