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Estimates of the contribution of road traffic emissions to northern hemispheric ozone are based on numerical simulations with atmospherechemistry models. They range from 2% to 12% for summer (Uherek et al., 2010). However, usually these numbers are obtained by the “perturbation method”. In Section 4, we show that this approach only gives the sensitivity for adding more NOx, but not the actual contribution from a single sector. Note that these two numbers would agree in a linear chemical system, but they differ substantially in non-linear chemical regimes (Grewe et al., 2010).
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