Hello billybob1978,
Welcome to Apple Support Communities. It sounds like you're having trouble with the Air Quality Index complication on your Apple Watch. I'd be happy to share information that may help.
AQI may not be available in all cities. If you navigate to the Watch app > Weather, and change your default city to a major city, see if you're then able to view the AQI reading for that location.
If you're still having trouble with this complication, unpair your Apple Watch and iPhone and pair them again: Unpair and erase your Apple Watch.
Take care.