character: Prof. James Lee
topic: Chemical Composition of Air Pollution
grade: 9
subject: Chemistry
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character: Dr. Maria Chen
topic: Impact of Air Pollutants on Human Health
grade: 9
subject: Chemistry
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character: Ms. Sarah Patel
topic: Sources of Air Pollution and Their Effects
grade: 9
subject: Chemistry
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character: Mr. David Kim
topic: Methods to Reduce Air Pollution
grade: 9
subject: Chemistry
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