Pollution in the will have the greatest effect on human health. a.
troposphere
b.
stratosphere
c.
mesosphere
d.
thermosphere

it's d.thermisphere

hope it's helpful for u

The Troposphere

Explanation:

But in the troposphere, near ground-level, ozone molecules are both air pollutants, threatening the health of living things, and greenhouse gases, trapping heat and contributing to climate change. A small amount of ozone does occur naturally at ground level. Plants and soil release some. Some migrates down from the stratosphere.

a

explanation:

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