Not too sure of the air quality but it was a pleasant evening. It cooled down about 11:00. Racing until 1a.m. has it's benefits. Don't get me wrong, I had a 9.68 time slip but it was due to smoking the tires off the line. Funny, my best time on street tires, any tires, was with me just rolling onto the throttle, not smashing it to the floor.