I had to work in Shenzhen from time to time and burned my eyes, my nose and my throat.
Even Tokyo was bad from time to time.
Oh, and then there is Guadalajara when they are burning crops in September.Sun is like an orange ball that you can look right at. (I know, I know, the preposition thing)
I do not believe this sentence is one that ends with a prepositional phrase. humblegunner, we need a ruling!