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That’s true but you have that problem wherever you take measurements or in whatever way you present data. The US Consulate reports AQI from a single location but the local Chengdu government has 8 testing sites within 3rd ring road (which you can see here by clicking on the map icon). You can see how the pollution varies by location depending on proximity to major roads, etc.
Wonder if either of those stations’ values could make a significant drop if the sensor was to be moved to a higher or lower floor. I’m not sure, maybe it wouldn’t differ that much. Seems like more stations have popped up in recent months. Would love to have my own sensor to experiment with to get a better idea of how the values can be affected by different variables.