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Green walls use plant processes to improve air quality in buildings.
Did you know that too much carbon dioxide in the classroom can affect your body, and even your grades?
Catalytic converters use noble metals as catalysts to speed up chemical reactions. This makes vehicle emissions less harmful.
This backgrounder describes how vehicle emissions work and how they affect air quality, including their contribution to smog.
This backgrounder explains what greenhouse gases are and how they contribute to climate change.