... arrival altitude and periods of time on MOZAIC profiles. Be-fore and after the heat wave and for arrival altitudes in the middle and upper tropo-15921ACPD7, 15911–15954, 2007 Pollution during ... ozone and 3 years for CO, see Sect. 2 for more details). Before the heatwave, the ozone and CO mean profiles do not show any significant anomaly. During theheat wave, positive anomalies show up for ... (Vautard et al., 2005) and (Solberg et al., 2007), and eventual additional con-tributions from enhanced biogenic isoprene emissions over France and Germany and2 5from biomass burning emissions from...