 His observations help correlate and corroborate data collected from the science instruments, including the measurement of air pollution by satellite, which measures carbon monoxide levels in the atmosphere.Taking such measurements on this flight helps understand changes in the distribution of carbon monoxide as well as other seasonal changes in the environment that have occurred since "Endeavour"'s last mission in April.On Monday, 3 October 1994 at 5 pm CDT, STS-68 MCC Status Report # 6 reports