character: Dr. Smith
topic: Catalytic Converters and Environmental Impact
grade: 9
subject: Chemistry
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character: Engineer Johnson
topic: Role of Catalytic Converters in Reducing Emissions
grade: 9
subject: Chemistry
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character: Professor Lee
topic: Chemical Reactions in Catalytic Converters
grade: 9
subject: Chemistry
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character: Environmental Scientist Davis
topic: Impact of Vehicle Emissions on Air Quality
grade: 9
subject: Chemistry
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