The Environmental Control and Life Support System of a spacecraft provides astronauts with breathing air and handles everything from temperature regulation to removing carbon dioxide as astronauts breathe.
That’s why engineers with NASA’s Commercial Crew Program work so closely with the companies building the next generation of human-rated spacecraft to make sure the systems meet agency requirements for missions to the International Space Station. Read more about the systems testing under way at http://go.nasa.gov/2lE7xIm