Figure 6: Observed and simulated levels of NO2 diurnal mean (a) and 98-percentile of hourly levels (b) at Torkel Knutssonsgatan (city centre of Stockholm), for present conditions (i) and simulated projections of future levels with only climate change effect (ii), including also emission changes in Europe (iii) and adding local emission changes in Stockholm (iv), see Table 2 for explanations. Error bars indicate lowest and highest annual average value of the three years. Unit: 𝜇  gm−3. Simulated concentrations are bilinearly interpolated to the location of the monitor location.