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Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
In the composition of normal air of the atmosphere at ground level in an unpolluted area, which one among the following is found inhighest concentration ?
assistant
The correct answer is  The normal composition of external air by volume is nitrogen-78.1%,oxygen-20.93%, carbon dioxide- 0.03%, Argon 0.9%. Park's Textbook of Preventive and Social Medicine, 25th Edition, Pg 791