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Actually carbon dioxide concentration increases at midnight and decreases at dawn

At night the concentration is higher because plants take in oxygen and breathe out carbon dioxide at night so the concentration is higher.

At dawn the concentration is lower because, plants breathe in oxygen at daytime and breathe out CO2 so the concentration is lower.

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9y ago
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10y ago

In presence of sun light the plants absorb carbon dioxide from air and by its utilization prepare their food (photosynthesis) and by respiration they release carbon dioxide in a small quantity. At night the respiration continues but photosynthesis terminates so result is an increase of carbon dioxide in air.

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11y ago

bacause more cars driver drive at midnight

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11y ago

Because It's Night

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Q: Why is the amount of carbon dioxide highest during midnight and lowest at 12 noon?
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