I began to research the oxygen levels based on heat, humidity etc., wondering if that might explain less oxygen getting to our brains, lungs and heart.
Will report my findings!!!!!
http://www.healthcommunities.com/evaluating-lung-problems/warm-weather-respiratory-illness.shtml
The body demands more oxygen as it works to stay cool, which can lead to decreased lung function. This can result in abnormally rapid or deep breathing, a condition called hyperpnea.