I've only seen smog in Miami from around dawn to dusk in downtown. When you are on 95 south heading towards downtown during the day you can see the yellowish haze around the skyline but I've never seen this in any other part of the state.
Florida is as flat as a piece of, well, PLYWOOD! I remember as a kid we had those stupid smog inspections and then they got rid of them. Then they brought them back but only for Miami-Dade, Broward, Palm Beach, Pinellas and Hillsborough Co.s. What a crock!!!!!!! Why only the five most populas counties? $$$$$$!!!!! Jeb got rid of them because it was well, a total scam and a waste of time. I remember in Miami-Dade right in front of the DMV where they did those stupid smog inspections, there would be a mechanic with a sign outside saying "Pass your inspection here!"
They'd rig your car just to go across the street and pass and then comeback and set it back to spec. Such a scam.
Then they allowed mechanics to become "certified" emissions inspectors and they would simply charge you twice the price of the DMV and give you the sticker without even bothering to inspect it. Again, a big scam. I've been told by a couple of muffler shops that as long as you have your cat on and it's in good working order, you'll be fine. Also if your car is older then I believe 1974-76, somehwere in there, then you are exempt.