Air pollution—why is it such a hazard in our environment? This colorful chart includes graphics, tables and text to help your students gather information about air pollution. Detailed diagrams provide an atmospheric profile, show methods of pollutant dispersion, describe major pollutants and show their effects on the human body and green foliage. Physical data table includes facts on clean air composition, sizes of airborne impurities and nationwide emissions of major pollutants. Printed on durable, heavyweight paper. Size: 28" × 22½".