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.
http://www.oxygen-review.com/human-body.html
Decrease of oxygen supply to the brain even though there is adequate blood flow caused by carbon monoxide poisoning, pollution in our cities, choking or suffocation can create conditions like tiredness, depression, irritability, poor judgment and health problems.
Increasing the oxygen supply to the brain and nervous system will reverse these conditions.