Open the windows early in the morning when the air is still cool outside and get some fresh air in your house. (sleepchampions.net)
It's rare to be able to get some fresh air while waiting in an airport, so this is a welcome option. (rewardexpert.com)
Of course this isn't practical for all situations, but when the weather is nice, why not get some fresh air with the added benefit of exercise? (coachcalorie.com)