The present invention relates to the field of detection of combustible, flammable and toxic gases present in the air, particularly any way generated by pipe leaks, such as leaks of gaseous hydrocarbons or evaporation or similar potentially toxic and/or explosive gases. For example a sector object of the present invention is the gas environmental detection, more particularly for safety and protection of operators in gas drilling, extraction, transport and stocking. The present invention described a system of detection of flammable and/or toxic gases, comprising detection elements able to increase the reliability of detection of said elements dangerous for both human beings and the environment.