Particle systems wont cull

Ive set the particle systems up with local space and the other things to make the warning bubble go away (ie they should cull). But when I run my game and use a script to find all the alive particle systems (and update on fly) it is huge, even when I am looking into space and they are not in my frustrum. So how do you actually make these particle systems be culled? There is things happening miles away behind me, that don't need to happen, like smoke etc. Thanks.