•MQ-2: Sensitive to methane, butane, LPG, smoke (for flammable gases)
•MQ-3: Alcohol, ethanol, smoke
•MQ-4: Methane, CNG gas
•MQ-5: Natural gases, LPG
•MQ-6: LPG, butane gas
•MQ-7: carbon monoxide
•MQ-8: Hydrogen gas
•MQ-9: Carbon monoxides, flammable gases
•MQ-135: Air quality, benzone, alcohol, smoke