Continuous measurements of atmospheric CO2 and O2 have been made at Weybourne since late 2007. Air is sampled from a 10 m a.g.l. tower (approx. 20 m a.s.l.) located within 50 m of the North Sea coast. Air is sampled continuously and both CO2 and O2 concentrations are reported as 2-minute time averaged intervals in ppm and per meg units of dry air respectively.