TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Agent: The odorization agent is 1-octene-3-one, 2,3-butane dione, pentane-2,3-dione, hexane-2,5-dione, heptane-2,5-dione, ethylidene diethyl ether, isopropanol, n-butanol, isobutanol, amyl alcohol, propargyl alcohol, beta,gamma-hexenol (cis-hexene-1-ol), formaldehyde, acetaldehyde, propionaldehyde, hexanal (caproaldehyde), cumin aldehyde, acetone, 2-octanone, 3-octanone, diacetyl(2,3-butane dione), acetophenone, methyl formate, methyl acetate, methyl propionate, methylphenyl acetate, ethyl formate, ethyl acetate, isopropyl formate, isoamyl acetate, n-amyl acetate, phenyl ethyl formate, 2-isopentenyl acetate, ethyl propionate, butyl acetate, isobutyl acetate, amyl propionate, ethyl caproate, amyl butyrate, ethyl caprylate, ethyl caprate, hexyl butyrate, ethyl cinnamate, benzyl acetate, ethyl crotonate, ethyl 3,3-dimethyl acrylate, ethyl-4-methyl-4-pentenoate, ethyl-4-methyl-3-pentenoate, ethyl hept-3-enoate, ethyl pyruvate, propyl crotonate, methyl acrylate, butylacrylate, allyl acrylate, methyl methacrylate, menthyl acetate, bornyl acetate, (beta)-phenyl ethyl acetate, allyl caproate, ethylmethyl phenyl glycidate, p-cresyl acetate, acetol acetate, ethyl 9-decenoate, 2,3-octane dione, methyl-3-acetoxy-butanoate, propionoin, 2-methyl-2-pentenal, acetoin acetate, methyl 3-hydroxy-butyrate, 2-methyl-1-heptene-3-ol, 8-nonene-2-one, acetoin, 3-methyl-3-butenyl acetate, tetrahydro citral, allyl alcohol, butanal (butyraldehyde), 2,3-butane dione (diacetyl), isobutyl cellosolve, isobutyraldehyde, carbitol acetate, 2-decenal, decanal, diisobutyl carbinol, dodecanal (lauryl aldehyde), ethylacrylate, ethyl butyrate, ethyl valerate, ethyl vinyl ketone, ethyl 2-methyl butyrate, heptanal, 1-heptanol, 2-heptanone, 2-heptenal, 2-hexenol, mesityl oxide, 2-methyl butanal-1, 3-methyl butanal-1, 2-methyl butanol, methyl isoamyl ketone (5-methyl-2-hexanone), 2-methyl-1-pentanol, 2-methylbutyl acetate, 2-methyl propanal (isobutyraldehyde), 2-nonanal, n-nonanal (pelargonic aldehyde), 2-octenal, octanal (n-caprylaldehyde), octyl acetate, 1-pentene-3-one (ethyl vinyl ketone), iso pentanol, pentanol (valeraldehyde), 2,4-pentane dione (acetylacetone), isopentyl acetate (isoamyl acetate), pentyl acetate (n-amyl acetate), propanal (propionaldehyde), propanone acid, propyl butyrate, undecanal, butyroin, tetrahydrofuran, 2-methyl-tetra hydrofuran, cyclohexene oxide, m-cresol, N-(2'-furfuryl)pyrrole, 2-pyrrole aldehyde, 5-methyl-2-pyrrole aldehyde, N-ethyl pyrrole aldehyde, 2-acetyl-N-methyl pyrrole, diketene, 5-acetyl 2-methyl oxazole, 2-acetyl furan, 2-methyl furan, furfural, furfuryl acetone, 5-methyl-2-furfural, dihydro furanone, cyclopentanone, phenyl n-butyrate, 2-phenyl-2-butenal, difurfuryl ether, chrysanthenone, 2-butene-4-olide, 2-methoxy phenol (guaiacol), 2-methoxy-3-ethyl pyrazine, 2-methoxy-3-isobutyl pyrazine, 2-methoxy-3-isobutyl pyridine, 2-methoxy-3-isopropyl pyrazine, 2-methoxy-3-propyl pyrazine, anisole, benzaldehyde, 1,8-cineole, cyclopentyl acetate, 2-ethoxy-3-ethyl pyrazine, 2-hydroxy-3-methoxy benzaldehyde (o-vanillin) and/or phenyl ether. The fuel cell comprises a graft polymerization type resin film or hydrocarbon type resin film, as electrolyte film, and is a solid polymeric type fuel cell.