niagara particles getting aliased

I am having a problem with the niagara particles system, my material is getting with a bad quality when the camera is stopped


but when I move the camera, the image is perfect

I also noticed that the particle in distance is a lot aliased


you can see that near by the particles is nice and smooth, but as soon as it get a little distant the quality is getting worst and worst

I think that is because of the shadow quality, it’s a lot aliased.

Can someone help me with set this less aliased?