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Historically, "No. 2" in a Khmer context almost exclusively refers to

Urban Greening: Increasing the number of trees in urban centers acts as a natural filter for pollutants. no2 in khmer exclusive

Chemical Nature: It is a reddish-brown, pungent gas composed of one nitrogen atom and two oxygen atoms. It is a major component of air pollution and smog. Key Facts about NO2cap N cap O sub 2 Historically, "No

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