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ID number:307574
 
Evaluation:
Published: 31.05.2012.
Language: English
Level: Elementary school
Literature: n/a
References: Not used
Extract

Air supplies us with oxygen which is essential for our bodies to live. Air is 99.9% nitrogen, oxygen, water vapor and inert gases. Human activities can release substances into the air, some of which can cause problems for humans, plants, and animals.

Smog is a type of large-scale outdoor pollution. It is caused by chemical reactions between pollutants derived from different sources, primarily automobile exhaust and industrial emissions.…

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