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character: Ozone Layer
topic: Ozone Layer Depletion
grade: 11
subject: Chemistry
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character: Air Pollutants
topic: Impact of Air Pollutants on Health and Environment
grade: 11
subject: Chemistry
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character: Chlorofluorocarbons (CFCs)
topic: Role of CFCs in Ozone Layer Depletion
grade: 11
subject: Chemistry
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character: Greenhouse Gases
topic: Contribution of Air Pollutants to Global Warming
grade: 11
subject: Chemistry
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