I asked the Meraki MT team about this exact same thing after having a large lead acid battery overheat and vent releasing dangerous hydrogen sulfide. This gas in high concentrations instantly kills your sense of smell which means you could walk into a room filled with high levels and not know. This gas able able to kill as well.    As @Larry_Woods mentioned the TVOC sensor might pick it up but not accurately.  ... View more

Imo you should not bother about dashboard throughput tool . You could use it as indication to like max 200Mbps with mx or ap. If you want to test throughput use a client. And for wifi you then would need something like 80 or more MHz channel and client supporting 3 spatial streams https://documentation.meraki.com/General_Administration/Tools_and_Troubleshooting/Throughput_test_to_the_Cisco_Meraki_Dashboard#Factors_Affecting_the_Dashboard_Throughput_Test ... View more

Yet another reporting of the issue here.  Currently on 28.6. MR APs randomly lose cloud connectivity. confirmed accessibility to 209.206.48.0/20 ... View more