We received an email asking about the dust everyone was talking about in the trip advisor and virgin islands online forums. The pictures below show the effect of the dust on visibility. Keeping in mind that St. Croix is 43 miles. Even with the dust, the visibility in St. John is still greater than at our home in Pennsylvania.
The dust has little negative effect (other than limiting long range visibility). It does however help to create some amazing sunrise and sunset opportunities for photography.