*3.4. Urban Planning Strategies for the CID*

For the CID (Central Innovation District), we looked at the frequency of tropical nights and UHImax to examine the effects of the urban planning strategies (Figures 10 and 11). In contrast to The Hague Southwest, the effect of the urban planning strategies is larger for the current climate, and therefore, is presented in Figure 10. The most urbanized neighborhoods 1 and 3 show the largest increase in tropical nights in both strategies, from 3.5 tropical nights per year up to more than five tropical nights per year in the current climate. The future climate scenarios foresee 8–15 tropical nights per year in the GL and WH scenarios, respectively. When compared to the district, The Hague Southwest, it is not clear which strategy is best. However, differences between the two strategies for the 95th percentile in UHImax reveal that the strategy where green spaces are preserved most (strategy C) is the best choice (Figure 11). The neighborhoods 1, 2, 3, and 7 show mixed results, which is due to the small sizes of the areas. If the neighborhoods were larger, then strategy C would result more clearly in less heat stress. In the Supplementary Materials the other climate scenarios are displayed for the urban planning strategies for CID and The Hague Southwest, the number of tropical nights for the warmest year 2006, and monthly transformation tables for temperature, DTR and global radiation from the current climate to the future climate in 2050.

**Figure 10.** Modeled number of nights above 20 ◦C per year for the CID in the current climate for (**A**) current housing, (**B**) constructing high-rise buildings whereby green spaces are preserved as much as possible, and (**C**) constructing high-rise buildings whereby the vegetation fraction is increased.

**Figure 11.** Difference in the modeled 95th percentile of the UHImax between strategy B and strategy C for the WH climate scenario.
