This data is provided by a WeatherDuino AQM sited in Crewkerne Somerset
Air Monitoring on ESP32, using BME680 and CCS811 environmental sensors. Sensor data on this channel may not be calibrated.
My own device based on ESP8266. Sensor for temp, humm and pressure is BME280. Second sensor is MH-Z19 for CO2 concentration. Device located at office or home, Moscow, Russia.