11.7 ppb (A Coruna)[] 127/35 ppb (Seul)[] 5 ppb electrochemical (WO3/Pt)[] 18 ppb chemiresistor (WO3/Cr2O3)[] 3.6 ppb ICOS[] 0.03 ppb lase QCL[] 4 ppb electrochemical sensor[] CO 630-08-0 1350 1.6 ppm (Karachi)[] 0.592 ppm (Hong Kong)[] 1.7 ppm (Rio de Janeiro)[] 0.53 ppm (London) [] 1.2 ppm (Seul)[] Coal burning Vehicular exhost Cigarette 1 ppm chemiresistor (Ca-SnO2)[] 1 ppm electrochemical sensor [] 0.1 ppm controlled potential electrolysis[] 4 ppb electrochemical sensor[] C Ammonia 7664-41-7 1260 22 ppb (Santiago, Chile)[] 24.7 ppb (Rome, Italy)[] 5.5 ppb (New York, USA)[] 8.2 ppb (Salzburg, Austria)[] 9 ppb (Munich, Germany)[] Aggriculture, vehicular exhaust 0.014 ppb 50 ppm AIMS[] 18 ppb chemiresistor solution)[] 50 ppb chemiresistor (MoO3)[] A Acetone 67-64-1 435 18.6 ppb (Ottawa, Canada)[] 5.4 ppb (Melbourne, Australia)[] 1.1 ppb (Sao Paulo, Brasil)[] 2.4 ppb (Quinzhou, China)[] 13.5 ppb (avg from several towns)[] 7 ppb (Beijing)[] Solvents, oxidation of NMHCs 0.02 ppb 14 ppb AIMS [] 500 ppb AIMS[] 20 ppb Si:WO3 chemiresistor [] 120 ppb Pt-WO3 chemiresistor[] 130 ppb optical spectroscopy[] 170 ppb CTL A
2-Propenal 107-02-8 5.8 0.6 ppb (Sao Paulo)[] 0.09 ppb (Zurich, Switzerland)[] vehicle exhaust 50 ppb AIMS[] B 2-Propenal, 78-85-3 3.2 0.1 ppb (Hong Kong)[] 0.24 ppb (Nashville)[] 0.02 ppb (Zurich, Switzerland)[] oxidation of isoprene, vehicle exhaust B Propanal, 78-84-2 1.3 kitchen waste, vehicle exhaust C Butanal, 96-17-3 1.5 kitchen C Butanal, 590-86-3 1.7 kitchen waste C n-Hexanal 66-25-1 26 1.2 ppb (Melbourne)[] 0.35 ppb (Rome)[] Fuel combustion 24 ppb AIMS [] 0.3 ppb MCC-IMS [] A n-Heptanal 111-71-7 7.1 0.4 ppb (Rome)[] Fuel combustion, atmospheric photooxidation of HCs, kitchen A n-Octanal 124-13-0 8.2 0.48 ppb (Rome)[] Fuel combustion, atmospheric photooxidation of HCs, kitchen waste 28 ppb AIMS [] 0.1 ppb MCC-IMS [] A n-Nonanal 124-19-6 13.6 1.4 ppb (Melbourne)[] 1.2 ppb (avg from several Towns) [] 0.37 ppb (Rome)[] 0.14 ppb (Niterói City, Brasil)[] Fuel combustion, atmospheric photooxidation of HCs, kitchen waste 0.3 ppb MCC-IMS [] A
Isoprene 78-79-5 36 0.3 ppb (Seul)[] 0.8 ppb (Karachi)[] 0.13 ppb (Lille)[] 0.34 ppb (Rome)[] 0.252 ppb (Hong Kong)[] 0.66 ppb (Guangzhou)[] 0.41 ppb (Nashville)[] 0.27 ppb (A Coruna)[] Plants, vehicular emissions 0.003 ppb 36 ppb MIR[] A 1,3-Pentadiene, 2-methyl-, Z- 2787-45-3 0.3 C 1,3-Pentadiene, 2-methyl-, E- 926-54-5 0.2 C 2-Pentene, 625-27-4 1.7 C 1-Heptene 592-76-7 0.23 C n-Heptane 142-82-5 0.5 0.5 ppb (Seul)[] 3.9 ppb (Karachi)[] 9 ppb (Rio de Janeiro)[] 0.05 ppb (Rome)[] 0.56 ppb (Guangzhou)[] 0.34 ppb (A Coruna)[] 0.09 0.53 ppm (London) [] petrol evaporation, vehicle exhaust C 1-Octene 111-66-0 0.5 C n-Octane 111-65-9 1.5 0.3 ppb (Seul)[] 1.1 ppb (Karachi)[] 1.2 ppb (Rio de Janeiro)[] 0.1 ppb petrol evaporation, vehicle exhaust C
0.79 ppb (Guangzhou)[] 0.3 ppb (A Coruna)[] 0.04 ppb (London) [] 1-Nonene 124-11-8 0.57 C n-Nonane 111-84-2 2.5 0.6 ppb (Seul)[] 0.7 ppb (Karachi)[] 2.1 ppb (Rio de Janeiro)[] 0.95 ppb (avg from several Towns) [] petrol evaporation, vehicle exhaust C Methanol 67-56-1 160 8 ppb (Barcelona)[] 22 ppb (avg from several Towns) [] 14 ppb (Rio de Janeiro, Brasil)[] 5.8 ppb Japan)[] 1.8 ppb (Zurich, Switzerland)[] Solvents, biofuel evaporation, 100 ppm AIMS[] 380 ppb CTL B Ethanol 64-17-5 105 37 ppb (Melbourne)[] 64 ppb (avg from 50 studies) [] 66.4 ppb (Rio de Janeiro, Brasil)[] 8.2 ppb (Osaka, Japan)[] 176.3 ppb (Sao Paulo, Brasil)[] 6.6 ppb (Zurich, Switzerland)[] Solvents, biofuel evaporation, 0.525 ppb 55 ppb AIMS [] 300 ppb biochemical[] 700 ppb CTL [] C 2-Propanol 67-63-0 69.6 7.4 ppb (Ottawa, Canada)[] 7.2 ppb (Osaka, Japan)[] 44.2 ppb (Sao Paulo, Brasil)[] Disinfectants, antifreezers, biofuel evaporation C
Dimethylsulfide 75-18-3 9.0 0.37 ppb (Seul, Korea) [] B Allyl methyl sulfide 10152-76-8 0.5 C Methyl propyl sulfide 3877-15-4 1.5 C p-Cymene 99-87-6 0.8 Oxidation of α-pinene C DL-Limonene 138-86-3 6.7 9.4 ppb (Rio de Janeiro)[] 19.6 ppb (Melbourne)[] 3.7 ppb (avg from several Towns) [] Plants, Wood emission, food, kitchen 0.9 MCC-IMS[] C α-Pinene 80-56-8 0.65 2.4 ppb (Rio de Janeiro)[] 6.2 ppb (Melbourne)[] 0.2 ppb (Rome)[] 0.21 ppb (Milan)[] 0.19 (A Coruna)[] Plants, Wood emission, food, kitchen waste 0.9 MCC-IMS[] C Furan, 534-22-5 6.8 B Furan, 930-27-8 0.3 0.05 ppb (USA)[] oxidation of isoprene, vehicle exhaust C Furan, 3777-69-3 0.23 C Acetonitrile 75-05-8 8.3 0.12 ppb (Sydney)[] biomass burning B γ-Butyrolactone 96-48-0 5.8 solvents B Methyl acetate 79-20-9 1.6 0.06 ppb (Zurich, Switzerland)[] Solvents, oxidation of MTBE and TAME B Dimethyl selenide 593-79-3 0.14 C