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MQ216 Natural gas\Coal gas MQ303A Alcohol MQ306A LPG, Propane MQ309A Carbon Monoxide (CO), Flammable Gas . ISSN (Print) : 2320 - 3765 ... This review article focuses on the use of MOS gas sensor based electronic noses for food applications. The review also sensors [9] ISSN (Print) : 2320 - 3765