How do you create deep landscapes using atmospheric perspective?

"Our eyes can be tricked into seeing things that aren’t really there. Observe:

"The small blue dot looks like the distant exit of a tunnel. The small red dot looks like it is coming towards you.

"Close observation will also reveal that objects in the distance not only appear cooler—objects will appear bluer!

"Why blue, you ask? That, my friend, requires a quick science lesson in light refraction!

"You must also notice the difference in value—how dark or light the color appears.

"How does the value change as the mountains get further away?

"Do the distant mountains have

darker
or
lighter
values?