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The second change is the addition of a slider to filter the map for locations with certain air quality regarding CO2. While the GO IAQS Standard just uses 3 different colors, there is a finer grained scale from 10 (best) to 0 (worst) which is used by this filter.

Every scale or color scheme comes with advantages and disadvantages, and at first I way rather sceptical of just using 3 colors, but it really adds a lot of visual clarity to the map and for exploring the smaller differences, both the previous color scheme and the filter option can be used.

Setting the threshold for moderate at 1400ppm is also maybe a bit higher than some would prefer - from a pragmatic point of view however a change to 1200 would just affect around 5% the locations in the dataset, and maybe a bit less positively connotated word than “moderate” could be picked for it.