character: Mr. David Kim
topic: Role of Catalysts in Air Quality Improvement
grade: 9
subject: Chemistry
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character: Mr. John Smith
topic: Chemical Reactions and Air Pollution
grade: 9
subject: Chemistry
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character: Ms. Sarah Lee
topic: Impact of Catalysts on Emissions Reduction
grade: 9
subject: Chemistry
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character: Dr. Emily Chen
topic: Green Chemistry and Its Role in Sustainable Air Quality
grade: 9
subject: Chemistry
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