Todays atmosphere is only 20.9% oxygen. These levels are even lower in cities and places where smog and pollution choke the air. It is estimated that todays environment may only contain less than half of the oxygen our bodies require for optimum health. Pollution and greenhouse gases are depleting oxygen at an alarming rate.
DISCLAIMER: DMOZing.com is not affiliated in any way, shape, or form with DMOZ, AOL, Netscape, their management, entities or their official websites. Links to external websites on this website does not constitute endorsement.