character: Professor Sarah Johnson
topic: Chemical Reactions in Air Pollution
grade: 11
subject: Chemistry
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character: Dr. Emily Carter
topic: Effects of Ozone on Human Health
grade: 11
subject: Chemistry
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character: Mr. David Lee
topic: Carbon Emission and Climate Change
grade: 11
subject: Chemistry
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character: Ms. Jessica Tan
topic: Nitrogen Dioxide and its Environmental Impact
grade: 11
subject: Chemistry
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