The type of radiation that passes most easily through Earth's atmosphere is radio waves.

Here's why:

* Longer wavelengths: Radio waves have the longest wavelengths among the electromagnetic spectrum. This means they have less energy and interact less with the molecules in the atmosphere.

* Atmospheric transparency: The atmosphere is largely transparent to radio waves. This is why we use radio telescopes to observe distant objects in space.

* Other types of radiation: Other types of radiation, like visible light, ultraviolet radiation, X-rays, and gamma rays, are absorbed or scattered by the atmosphere to varying degrees.

However, even radio waves are not completely unaffected by the atmosphere. Certain atmospheric layers and conditions can interfere with radio wave transmission.