A sensor device for the detection of a chemical or biological agent comprising: an intake port for an air sample connected to; a mixing chamber containing: at least means (120, 110, 100) for the introduction of a detection improvement agent into the mixing chamber; at least one heating or cooling means; at least one storage container and wick for the introduction of water or a aromatic solvent into the air sample; and at least one detection element selected from the group consisting of a polymer film or olfactory cells, and/or an array of polymer films, each sensitive to a different chemical or biological agent operable to detect a chemical or biological agent in the air sample, said mixing chamber connected to; an exhaust port; wherein the detection improvement agent is a liquid or gel, operable to interact with the chemical or biological agent so as to improve the ability of the at least one detection element to detect the chemical or biological agent, and wherein the means for introduction of a detection improvement agent comprise at least one storage container, connection tube, and atomizer for the introduction of a liquid or gel detection improvement agent, wherein the liquid or gel detection improvement agent travels via the connection tube through the atomizer, into the mixing chamber. an intake port for an air sample connected to; a mixing chamber containing: at least means (120, 110, 100) for the introduction of a detection improvement agent into the mixing chamber; at least one heating or cooling means; at least one storage container and wick for the introduction of water or a aromatic solvent into the air sample; and at least one detection element selected from the group consisting of a polymer film or olfactory cells, and/or an array of polymer films, each sensitive to a different chemical or biological agent operable to detect a chemical or biological agent in the air sample, said mixing chamber connected to; an exhaust port; wherein the detection improvement agent is a liquid or gel, operable to interact with the chemical or biological agent so as to improve the ability of the at least one detection element to detect the chemical or biological agent, and wherein the means for introduction of a detection improvement agent comprise at least one storage container, connection tube, and atomizer for the introduction of a liquid or gel detection improvement agent, wherein the liquid or gel detection improvement agent travels via the connection tube through the atomizer, into the mixing chamber. at least means (120, 110, 100) for the introduction of a detection improvement agent into the mixing chamber; at least one heating or cooling means; at least one storage container and wick for the introduction of water or a aromatic solvent into the air sample; and at least one detection element selected from the group consisting of a polymer film or olfactory cells, and/or an array of polymer films, each sensitive to a different chemical or biological agent operable to detect a chemical or biological agent in the air sample, said mixing chamber connected to; an exhaust port; wherein the detection improvement agent is a liquid or gel, operable to interact with the chemical or biological agent so as to improve the ability of the at least one detection element to detect the chemical or biological agent, and wherein the means for introduction of a detection improvement agent comprise at least one storage container, connection tube, and atomizer for the introduction of a liquid or gel detection improvement agent, wherein the liquid or gel detection improvement agent travels via the connection tube through the atomizer, into the mixing chamber.