Env_embers is Being a Dick

I’m making a surf map for TF2, and in the jail room I have four triggered areas that I want to have showing the particles. Each area has 500 particles, and for some reason won’t show any particles if you’re on the other side of the room, but will only show a slightly visible amount of them when you’re standing right in front of the env_ember entity.

What is a way to fix this, or a better entity to use?