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Please ignore the "carbon dioxide" answer. Clearly, they did not read correctly. The troposphere contains the most of the atmosphere's gas; approximately 75%.

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14y ago
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10y ago

Ozone is concentrated at 20-40 km above earth with highest concentration 6-8 parts per million. It is present in the stratosphere of the earth's atmosphere.

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15y ago

A: troposphere is the answer

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14y ago

...close to sea level.

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Q: Which layer of the atmosphere contains the greatest concentration of the Earth's gases?
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