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I think satellites are used this days, balloons too
by simion314 7y ago
I think satellites are used this days, balloons too
- seanmcdirmid 7y agoAQI is taken by fixed sensor stations, you can even get a map of them per Chinese city (along with individual readings for more localized AQI measurements). So a few Hebei officials were scamming the system by filtering the air directly around the sensor stations. Beijing was not amused.