What changed about the peppered moth population during the Second Industrial Revolution?

Moth became dark colored

Explanation:

Before industrial revolution, the peppered moth were of light color but with advent of industrial pollution, the barks of the tree became dark and in order to escape from the sight of the predators (that feed on light colored moth visible against the dark colored bark) these light colored moths evolved into dark colored moth.

well first you need the sample of the temperature and gas level. i couldnt write a hypothesis unless i had some data. i think temperature changes will effect volumes of gas because gas changed into a solid or liquid at specific temperatures.