noun
a word that represents a person, place, thing, or idea
preposition
a word that shows the relationship between a noun (or pronoun) and other words in a sentence
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The presence of pollutants in the air poses a threat to public health.
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I love the smell of fresh bread baking in the air.
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There's a feeling of excitement in the air as the concert approaches.
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With tensions rising, you could feel the anger in the air between the two parties.