The hot, humid haze present in the air when entering an un-air conditioned men's room at a large sports venue. Humidity levels must be near 99.9% humidity with a large portion of said humidity made up of urine vapor as opposed to water vapor.
When I walk into the men's room at Floyd Casey Stadium in Waco, Texas, I am greeted by the cloying smell of the urine fog within. I feel like I am breathing urine vapor into my lungs! Heaven help me if I have to drop a deuce and endure the unwelcome breathing treatment for more than 60 seconds.