Dirt and Dust in eyes.

My boy has been complaining of Dirt and Dust coming in the helmet and getting in his eyes. It has effected his driving once or twice.

He wears a Bell GP2.

What are you guys doing to keep the dirt out your helmet. I've seen some sort of neck gaiter that attaches to the helmet. I'm think that would do the trick.
On my Zamp Helmet I bought a deal to keep dust out of the helmet. It is velcro at bottom of the helmet and then it goes down around my neck. I haven't used it yet since its been so hot but you may consider something like that. Is it an extremely dusty track?