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character: Mr. Johnson
topic: Impact of Nitrogen Oxides on Air Quality
grade: 9
subject: Chemistry
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character: Ms. Roberts
topic: Sources of Nitrogen Oxides in Urban Areas
grade: 9
subject: Chemistry
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character: Dr. Lee
topic: Effects of Air Pollution on Human Health
grade: 9
subject: Chemistry
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character: Mrs. Patel
topic: Regulations and Solutions for Reducing Nitrogen Oxides Emissions
grade: 9
subject: Chemistry
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