I would be good to have a reference for the various new measurments ruuvi provides.
for example:
The American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) recommends that indoor CO₂ levels should not exceed outdoor levels by more than about 700 ppm, generally putting the maximum acceptable limit around 1,000 ppm.
At concentrations between 1,000-2,000 ppm, occupants may notice mild drowsiness, poor air quality, and reduced concentration.
The concentrations of carbon dioxide, methane and carbon monoxide at Pallas-Sammaltunturi, Sodankylä, Helsinki-Kumpula and Utö stations are presented as a long-term time series of several years (daily average values), and