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In this activity related to indoor air pollution, learners build take-home dust catchers with wax paper and petroleum jelly.

In this outdoor activity, learners search for lichen, a combination of a fungus and an alga living together. Lichen grow where most other plants cannot, on rocks, the trunks of trees, logs and sand.

In this activity, learners explore how engineers design devices that can detect the presence of pollutants in the air.