Before the activity, each student needs:

• pen or pencil
• Pre-Activity Reading (alternative: watch the Pre-Activity Presentation presented by the teacher)
• Pre-Activity Problem Set
• Vocabulary List

Each group needs:

• pens or pencils
• Activity Data Sheet, one per student
• Results and Reflection Questions, one per student
• (optional) Current Event Article or Engineering Identities Worksheet, one per student
• Connecting to the Big Picture Handout, one per student

To share with the entire class:

• 1-2 air quality monitors, such as a rented AQ-IQ Kit (containing 2 Pod low-cost air quality monitors) from the University of Colorado Boulder, or other low-cost monitors with multiple gas-phase sensors; see the Other section for details on obtaining the Pod (or alternate) monitors
• box or plastic container on which to position the monitor near the tailpipes (see Figure 3)
• watch, to measure test times
• ruler, to measure tailpipe-to-monitor distances
• 2-4 vehicles, from which to test exhaust emissions; it is best if the vehicles differ in engine size, fuel type, age and/or condition
• a computer/projector system, for the teacher to show one or two online videos, show the (optional) Pre-Activity Presentation, and plot the data for the class discussion