Gravity: Factory Calibrated Electrochemical Nitrogen Dioxide Sensor - Incorrect readings

Dear DF Robot team,

I'm using Gravity: Factory Calibrated Electrochemical Nitrogen Dioxide Sensor (0-20ppm, I2C&UART) with ESP32. 

Setup is the following:

VCC - 3.56V

GND

I2C - SCL and SDA. 

The device is configured in I2C - PASSIVE MODE

However I believe that the readings are far from real air conditiotions.

For example in Office the output is 0.13ppm - from calibrated I2C output with temperature compensation.

I (08:50:24.671) NO2 sensor Response: ff 86 00 03 2c 01 00 00 4a 
I (08:50:24.681) NO2 sensor Response: ff 87 01 f9 00 00 00 00 7f 
I (08:50:24.681) NO2_Sensor: Temperature compensated [20, 40] concentration: 0.127355
 

Also Vout - raw voltage reading is 1.87V - which is according to the manual ppm calculation far from real conditions. 

I'm pretty sure, that the concentration of NO2 in the office is not exceeding 0.001ppm.

Thanks for any guidance, how to make this sensor work. I use it for 7 weather stations for air pollution monitoring.