In this tutorial, we will show you how to create atmospheric particles for your scene using Adobe After Effects. We will be using the "CC Particle World" effect, so you won't need any external plugins to achieve this effect.

First, prepare your composition containing your cloud background. You can add a vignette or other effects to enhance your background. Once you have your background ready, start adding particles to make it more dramatic.

Use the "CC Particle World" preset available in the effects panel of Adobe After Effects. Apply this preset to a solid layer. Adjust the color, alignment, and fade of your particles to your liking.

To learn more about creating this effect and how you can make your own atmospheric particles, check out this video tutorial.