Oh, I see. Whether or not the dinosaur creatures are effected by the fog, I've yet to see them ever get driven within the limits of the city. I think the population is enough to keep them sufficiently scared away, as with most wild beasts.

In fact, the only time I ever saw one of those anywhere near the city was when someone who lived here was keeping it as a pet.

I think you have to actually breathe the fog to get sick from it. But if you're that worried...best to avoid all wild game for awhile.