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This activity uses an episode of poor air quality over the Midwest and Eastern seaboard to engage students in an exploration of the collection, comparison, analysis and utilization of air quality data. With the aid of a camera, the EPA website and Google Earth, students will determine local visibility. Students will also interpret images taken with the Moderate Resolution Imaging Spectroradiometer (MODIS) instrument aboard both the Terra and Aqua satellites to distinguish between three aerosols-smoke, dust and haze. Then students will then find online satellite images of the local area to determine aerosol types and possible sources. Four lesson extensions are included.