The moon isn't actually yellow today. The moon itself doesn't change color. It appears yellow, orange, or red sometimes due to atmospheric conditions:

* Dust and Pollution: When there's a lot of dust, smoke, or pollution in the air, it scatters blue light more effectively, leaving the longer wavelengths (yellow, orange, and red) to reach our eyes. This is why the moon can appear yellow or reddish during sunsets and sunrises.

* Low Angle of the Moon: When the moon is low in the sky, its light has to travel through more atmosphere. This increases the scattering of blue light, making the moon appear yellower.

So, the "yellowness" of the moon is an illusion created by the Earth's atmosphere, not a change in the moon itself.