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character: Catalytic Converters
topic: Emissions Reduction in Automobile Engines
grade: 11
subject: Chemistry
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character: Automobile Engines
topic: Greenhouse Gas Emissions
grade: 11
subject: Chemistry
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character: Emissions Test
topic: Regulations and Compliance
grade: 11
subject: Chemistry
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character: Environmental Chemistry
topic: Air Quality and Pollution Control
grade: 11
subject: Chemistry
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