This gas sensor can detect Butane, propane, methane, hydrogen and other combustible gases.It is capable of detecting various gases.This arduino-compatible special sensor raise alarms when the smoke, methane or any other harmful gas leaks in its reach.
This alcohol sensor is suitable for detecting alcohol on your breath, just like your common breathalyzer. It has a high sensitivity and fast response time. Sensor provides an analog resistive output based on alcohol concentration. The drive circuit is very simple, all it needs is one resistor. A simple interface could be a 0-3.3V ADC.
Please review the datasheet for conversions to ppm then Wikipedia.org for BAC.
This sensor monitor many kinds of gas, including: gas, butane, propane, methane, alcohol, hydrogen, smoke, etc. (It is a basic composition of range of MQ 3 and MQ5 )
Read more information on this wiki page.