Subject: I work in an office with very low levels of oxygen, what can I do?

I ask because I am working in an office, which now uses only recycled air due 
to our close proximity to "ground zero." By the afternoon the levels of carbon 
dioxide are great enough to induce a physical reaction. Will plants raise the 
levels of oxygen in our office enough to improve the quality of the air we 
breathe?  

Re: I work in an office with very low levels of oxygen, what can I do?