It was already reaching the hard to breathe stage at 6:15 when I poked my head out the door to get the paper. Haven't poked out since. Usually I open the windows in the kitchen/diningroom play area from 6:00 - 6:30 in the morning but after 15 minutes was making the air conditioner kick in and the dial for that is other side of the house so a good reason to close up and hope for better conditions later tonight instead.