Air Quality Sensor Breakout Board
This sensor is excellent for detecting hazardous gas that might be of concern for the family. This sensor can detect ammonia, aromatic compounds, sulfur, benzene vapor, smoke and other gases harmful gases. This gas sensor has a sensitivity ranging from 10 to 1000ppm and will require connection to a microcontroller to process the data. You can collect the data using the analog pin or using the digital pin as a trigger.
Resources: http://playground.arduino.cc/Main/MQGasSensors
Open Arduino IDE > Examples > Basic > AnalogReadSerial
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