In the second lesson of The Clean Air Campaign’s unit on the impact of air pollution on the respiratory system, students will determine the air quality for their area by analyzing data from monitoring stations; convert this data to an Air Quality Index value; investigate the impact of air pollution by measuring and comparing their own vital lung capacity on days with healthy and unhealthy air quality; and brainstorm strategies for protecting themselves and others from the harmful effects of air pollution. It is recommended that students complete “Every Breath You Take,” the first lesson in the unit, before beginning these activities.