Ground-level ozone

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What Wikipedia says

Ground-level ozone (O3), also known as surface-level ozone and tropospheric ozone, is a trace gas in the troposphere (the lowest level of the Earth's atmosphere), with an average concentration of 20–30 parts per billion by volume (ppbv), with close to 100 ppbv in polluted areas.

Excerpt from the Wikipedia article “Ground-level ozone”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

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