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character: Environmental Scientist
topic: Sources of Nitrogen Oxides in the Atmosphere
grade: 9
subject: Chemistry
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character: Chemistry Teacher
topic: Impact of Nitrogen Oxides on Air Quality
grade: 9
subject: Chemistry
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character: Traffic Engineer
topic: Role of Vehicles in Nitrogen Oxide Emissions
grade: 9
subject: Chemistry
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character: Policy Maker
topic: Regulations on Industrial Nitrogen Oxides Emissions
grade: 9
subject: Chemistry
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