NRT monitoring is provided by IAGOS. Profiles of O3 and CO from the NRT forecast with and without assimilation are compared with profiles from IAGOS at the airports visited each day. Time-series of the scores are also shown for each airport.

O3 and CO from the MACC reanalyses are validated with profiles from MOZAIC/IAGOS and from IAGOS-CARIBIC aircraft for the period 2003-2008. Time-series of the difference between model and observations are presented for each available year, along with profiles at individual airports, and the observed climatologies in the UTLS from observations made at cruise altitude.