Thank you. The only info I found was their cloud connection.

I was interested because I wouldn't have to deal with customs in their case, but considering the price and interesting integration, dealing with customs might be better :P

Welcome. Actually, on checking, they've also added a .json file with the latest measurements.

smbclient -U airvisual%PASSWORD \\\\192.168.X.Y\\airvisual -c "get latest_config_measurements.json"

if you want an interactive display. Otherwise there are a bunch of csv files with the archived values, under a time-varying filename like:

202301_AirVisual_values.txt

With format:

Date;Time;Timestamp;PM2_5(ug/m3);AQI(US);AQI(CN);PM10(ug/m3);PM1(ug/m3);Outdoor AQI(US);Outdoor AQI(CN);Temperature(C);Temperature(F);Humidity(%RH);CO2(ppm) 2023/01/01;00:00:03;1672531203;0.0;0;0;0.0;0.0;8;3;22.7;72.8;41;406;

Thanks for digging into the mucks of the quote end quote API. SMB makes me think they were aiming for the commercial market and just repurposed it for home.