The air we breathe in the lower atmosphere is not primarily composed of oxygen. Instead it contains 78% nitrogen, 21% oxygen and less than 1% gases like argon and carbon dioxide.
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The 2009-10 Winter Spare the Air season ended on February 28. There is currently no wood burning ban in place.
The Bay Area burn status will be updated daily during the 2010-11 Winter Spare the Air season beginning November 1.