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Ozone increase efficiency (%) normalized to the 1990s, i.e. change in O3 (DU) per emitted air traffic NOx (Tg N yr−1) relative to the 1990s. Results from the OsloCTM2 are based on Isaksen et al., 2001. Results for ECHAM/CHEM are based on Grewe (2007) for the 1960s, 1970s and 1980s; Grewe et al. (2002a) for 2015; and Grewe et al. (1999) for 2050.
| Model | 1960s | 1970s | 1980s | 1990s | 2015 | 2050-low | 2050-high |
|---|---|---|---|---|---|---|---|
| OsloCTM2 | 100% | 87% | 81% | 72% | |||
| ECHAM/CHEM | 34% | 71% | 94% | 100% | 98% | 81% | 72% |
