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Students become aware of the changes in visibility and sky color due to particles suspended in the air, called aerosols. They observe, document and classify changes in visibility and sky color over several days and understand the relationship between sky color, visibility and aerosols in the atmosphere. A student data sheet is included in the activity. This learning resource is part of the Atmosphere chapter of the GLOBE Teacher's Guide, and is supported by the GLOBE Aerosol protocol. GLOBE (Global Learning and Observation to Benefit the Environment) is a worldwide, hands-on, K-12 school-based science education program.