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As a model of acid rain, learners water plants with three different solutions: water only, vinegar only, vinegar-water mixture.

Learners observe and discuss a simple model of a wet scrubber, a device for cleaning industrial air pollution.

In this design-based activity, learners explore environments, ecosystems, energy flow and organism interactions by creating a model biodome. Learners become engineers who create model ecosystems.

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

In this activity, learners explore sensors and focus specifically on how to measure humidity using a sensor.