Yes, I've seen them twice here in Ontario, Canada. They are spectacular.They were actually quite easy to see recently, because they were magnified during the recent solar flares from the sun and they actually had a red 'glow'.

When we go up to my cottage, we used to see them all the time when I was young. But now because of all the new cottages being built and bright lights, it no longer is easy to see.

People always think of pollution as being garbage and urban waste, but light pollution can cause many problems as well and take away from nature's beauty.