Related by context. All words. (Click for frequent words.) 63 toxic gasses 61 harmful vapors 61 toxins 61 toxic chemicals 60 harmful contaminants 60 contaminants 60 pollutants 60 noxious chemicals 59 carcinogenic dioxins 59 TCE vapors 58 hazardous vapors 58 beryllium dust 58 toxic dioxins 58 benzene carcinogen 58 toxic pollutants 58 toxic vapors 57 mercury vapors 57 airborne pollutants 57 hydrocarbon vapors 57 PFOAs 57 algal toxins 56 solvent vapors 56 harmful toxins 56 toxicants 56 groundwater contaminant 56 carcinogen benzene 56 Volatile Organic Compounds VOCs 56 tetrachloroethene 56 suspected carcinogen 55 airborne particulates 55 toxic fumes 55 toxic substances 55 microcystins 55 PCBs polychlorinated biphenyls 55 polyaromatic hydrocarbons 55 potent carcinogen 55 toxic gases 55 carcinogenic chemicals 55 carcinogenic substances 55 PAHs polycyclic aromatic hydrocarbons 55 hazardous chemicals 55 hydrogen sulfide gases 55 #,# butadiene 55 THMs 54 Volatile Organic Compounds 54 polluted groundwater 54 pollutants emitted 54 carcinogenic pollutants 54 vinyl chloride 54 formaldehyde carcinogen 54 sulfur gasses 54 fine particulate pollution 54 volatile organic compounds 54 TCE trichlorethylene 54 tetrachlorethylene 54 chemical vapors 54 Volatile organic compounds 54 Sulfur compounds 54 VOCs 54 toxaphene 53 poisonous gasses 53 particulates 53 air pollution 53 noxious odors 53 drywall emits 53 gaseous pollutants 53 particulate pollutants 53 airborne mold spores 53 phosphine gas 53 radiological contaminants 53 harmful byproducts 53 waterborne microorganisms 53 carbon monoxide 53 Hydrogen sulfide 53 toxic pollutant 53 endotoxins 53 hazardous fumes 53 sulfur trioxide 53 toxic byproducts 53 trichloroethene 53 trichlorethylene 53 radioactive radium 53 disinfection byproducts 53 benzene arsenic 53 radioactive byproducts 53 contaminents 53 invisible odorless tasteless 53 toxin 53 Hydrogen Sulfide 53 mercury dioxins 53 pollutant 53 toxic residues 53 trichloroethane 53 PCBs dioxins 53 trichlorethylene TCE 52 airborne particulate matter 52 Particulates 52 harmful particulates 52 arsenic 52 noxious gases 52 diesel particulates 52 pollutant particles 52 tremolite asbestos 52 Asbestos fibers 52 carcinogenic fumes 52 Ultrafine particles 52 amphibole asbestos 52 chlordane 52 formaldehyde benzene 52 gaseous chlorine 52 Volatile Organic Compounds VOC 52 chlorine fumes 52 poisonous gases 52 Carbon monoxide CO 52 vapors 52 corrosives 52 ozone particulate matter 52 oxidized mercury 52 crystalline silica 52 carcinogenic chemical 52 radiological hazards 52 mercury arsenic 52 methylene chloride 52 benzene vapors 52 PVC shower curtains 52 combustion byproducts 52 contaminant 52 biotoxin 52 Hydrogen Sulphide 52 toxic 52 airborne asbestos fibers 52 flammable solvents 52 chlorinated solvent 52 sulfur gases 52 trihalomethanes THMs 52 noxious smells 51 airborne germs 51 carbon disulfide 51 chemical perfluorooctanoic acid PFOA 51 hydrogen sulphide 51 perfluorinated chemicals 51 arsenic benzene 51 toxic hydrogen sulfide 51 toxic solvents 51 Contaminants 51 E coli bacteria 51 silica dust 51 noxious fumes 51 hexavalent chromium 51 harmful chemicals 51 tetrachlorethylene PCE 51 noxious gasses 51 hydrogen sulfide 51 airborne contaminants 51 poisonous chemicals 51 pollution 51 diacetyl vapors 51 methyl chloride 51 carbon monoxide colorless odorless 51 charcoal filters 51 bioaerosols 51 indoor radon 51 polychlorinated biphenyl PCB 51 airborne particulate 51 Sulphur dioxide 51 atmospheric pollutants 51 stachybotrys 51 carcinogenic compounds 51 gases emitted 51 harmful gases 51 Diesel exhaust 51 diesel exhaust 51 aggravate asthma 51 manure lagoons 51 PCBs pesticides 51 coli bacteria 51 sulfur compounds 51 parasite cryptosporidium 51 DuPont DeLisle plant 51 hazardous solvents 51 radioactive nuclides 51 sulfuric acid mist 51 toxics 51 waterborne pathogens 51 hydrogen cyanide HCN 51 polycyclic aromatic hydrocarbon 51 bioaerosol 51 perfluorooctanoic acid PFOA 51 foul odors 51 plutonium americium 51 carcinogenic polycyclic aromatic hydrocarbons 51 ultrafine particles 51 cancer causer 50 fine particulates 50 arsenic cadmium chromium 50 TCE PCE 50 fumes emitted 50 polychlorinated biphenyls PCBs 50 outgas 50 arsenic chromium 50 trichloroethene TCE 50 Enterococcus bacteria 50 carbon monoxide nitrogen dioxide 50 contamination 50 toluene benzene 50 chemicals 50 chemical perfluorooctanoic acid 50 particulate soot 50 dioxins 50 fine particulate 50 polynuclear aromatic hydrocarbons 50 industrial solvent trichlorethylene 50 foul smelling odor 50 inhaled fumes 50 chlorine byproducts 50 Odours 50 perfluorinated compounds 50 chlorinated hydrocarbons 50 particulate matter emitted 50 dioxin 50 ozone particulates 50 chlorine disinfectant 50 radioactive iodide 50 allyl alcohol 50 volatilized 50 putrid odors 50 odorless colorless gas 50 flammable corrosive 50 chlorine vapors 50 fungi spores 50 PCB contamination 50 carbon monoxide hydrocarbons 50 Dioxane 50 flammable vapors 50 PFCAs 50 arsenic cadmium 50 carcinogens 50 gases 50 airborne pathogens 50 unpleasant smell 50 hydrofluoric acid 50 Legionella bacteria 50 arsenic mercury 50 arsenic contaminated 50 e coli bacteria 50 Chromium VI 50 heptachlor 49 marine biotoxin 49 dioxins furans 49 E.Coli bacteria 49 aggravates asthma 49 toxic hydrogen sulphide 49 PAH concentrations 49 bacterial spores 49 formaldehyde preservative 49 Nitrogen oxides 49 mercury selenium 49 cockroach allergens 49 Radioactive material 49 carbon tetrachloride 49 microbiological organisms 49 Sodium cyanide 49 Toxins 49 tributyltin TBT 49 noxious smell 49 spontaneously ignite 49 sulfur fumes 49 dioxides 49 dichloroethylene 49 particulate pollution 49 gaseous byproducts 49 chlorinated solvents 49 respirable particles 49 Propyl mercaptan 49 organochlorine pesticides 49 respirable 49 pollutant ozone 49 air toxics 49 chemical C8 49 E. Coli bacteria 49 polychlorinated biphenyl 49 electromagnetic fields EMFs 49 radio nuclides 49 airborne particles 49 VOC Volatile Organic Compounds 49 Aflatoxins 49 Stachybotrys 49 radon concentrations 49 perfluorooctane sulfonate PFOS 49 foul smelling odors 49 Nitrogen oxide 49 Diesel fumes 49 diesel fumes 49 fumes emanating 49 hazardous substances 49 incinerator ash 49 groundwater contaminants 49 biphenyls 49 tailpipe pollutants 49 friable asbestos 49 Volatile Organic Compound VOC 49 hydrogen sulfide fumes 49 carcinogens benzene 49 arsenic cadmium mercury 49 Vinyl chloride 49 boiler flue 49 rotten egg smelling 49 DBPs 49 trihalomethane 49 hydrogen sulfide ammonia 49 microbial contaminants 49 carcinogenic toxins 49 radioactive substances 49 benzene ethylbenzene 49 harmful gasses 49 benzene 49 listeria monocytogenes bacteria 49 carcinogenic substance 49 Hydrogen sulphide 49 poisonous carbon monoxide 49 invisible odorless 49 deadly neurotoxin 48 nano thermite 48 irritate lungs 48 bacterias 48 hydrocarbons carbon monoxide 48 Hexavalent chromium 48 biohazardous 48 ammonia hydrogen sulfide 48 benzene toluene xylene 48 #,# dichlorobenzene 48 asbestos fibers 48 methyl mercury 48 Shiranui Sea 48 groundwater contamination 48 barium cadmium 48 spore forming bacteria 48 salmonella bacterium 48 solvents 48 obnoxious odors 48 chromic acid 48 harmful substances 48 microscopic soot particles 48 poisonous fumes 48 noxious substances 48 furans 48 hydrogen sulfide H2S 48 isotope polonium 48 odorous compounds 48 radium naturally occurring 48 sulfuric compounds 48 naturally occurring radioactive 48 neuro toxin 48 kiln dust 48 smog forming pollution 48 perfluorochemicals 48 particulate 48 sulfurated hydrogen 48 fecal coliform contamination 48 airborne spores 48 particulate emissions 48 PBDEs polybrominated diphenyl ethers 48 flammable gases 48 mold dust mites 48 tiny airborne particles 48 HAAs 48 perfluorochemicals PFCs 48 fluorocarbons 48 vermiculite insulation 48 benzene formaldehyde 48 toxic mercury vapors 48 DDT PCBs 48 PCBs 48 Radioactive substances 48 dichlorobenzene 48 Campylobacter bacteria 48 particulate matter 48 dioxins PCBs 48 trichloramine 48 metal degreasing 48 Fecal coliform 48 chromium contamination 48 para dichlorobenzene 48 smog forming compounds 48 electromagnetic radiation EMR 48 cadmium arsenic 48 odorless tasteless 48 soot smog 48 gypsum byproduct 48 #,#,# trichloroethane 48 chlorine 48 brevetoxin 48 tributyl tin 48 Toxic chemicals 48 bioaccumulative 48 vapors emitted 48 glycol ethers 48 Hydrogen cyanide 48 contaminated groundwater 48 mold spores 48 particulate matter sulfur dioxide 48 popcorn flavoring 48 fumes 48 Rubbertown 48 enterococcus bacteria 48 particle concentrations 48 benzene toluene 48 monoxide 48 #,# DCB 48 harmful pollutants 48 gasses emitted 48 hydrogen sulphide H2S 48 polycyclic aromatic hydrocarbons 48 attracting vermin 48 parasite Cryptosporidium 48 estrogenic chemicals 48 noxious vapors 48 aquatic toxicity 48 Nitrosamines 48 carbon monoxide sulfur dioxide 48 endocrine disrupting chemicals 48 carcinogen dioxin 48 welding fumes 48 Carbon Monoxide 48 phosphine 48 noxious pollutants 48 Libby vermiculite 47 Escherichia coli bacteria 47 Flame retardants 47 vibrio bacteria 47 persistent bio accumulative 47 nitrogen dioxide sulfur dioxide 47 Mercaptan 47 polychlorinated 47 Trichloroethylene TCE 47 nitrogen oxide pollution 47 E Coli bacteria 47 organochlorines 47 rotten egg odor 47 aromatic hydrocarbons 47 Inorganic arsenic 47 furan 47 carbonyl sulfide 47 TTHMs 47 nitrates phosphates 47 bio accumulative 47 toxic fumes emitted 47 chloramine 47 arsenic selenium 47 noxious odor 47 unpleasant odors 47 degreasing solvent 47 glycol ether 47 legionella bacteria 47 potent toxin 47 VOCs Volatile Organic Compounds 47 diesel particulate emissions 47 Hydrogen Cyanide 47 nitric acids 47 Microscopic particles 47 degreasing agent 47 harmful radiations 47 nitrous oxides 47 toxic polychlorinated biphenyls 47 PDBEs 47 Polychlorinated biphenyls PCBs 47 fine particulate matter 47 pungent odors 47 actinides 47 dichloroethane 47 carcinogenic byproducts 47 peanut allergen 47 chemical compounds 47 Polychlorinated Biphenyls 47 insecticide malathion 47 radioactive isotopes 47 radiological contamination 47 Carbon tetrachloride 47 inhaling toxic 47 asbestos contamination 47 harmful dioxins 47 contaminated soil 47 ammonia vapors 47 fungal organisms 47 Sulfur dioxide 47 sodium hydrochloride 47 microcystis 47 combustible gases 47 odors 47 carbon monoxide nitrogen oxides 47 algal toxin 47 Smolinske 47 dimethyl sulphide 47 Particulate pollution 47 Mold spores 47 deadliest germs 47 nitrates 47 Hazardous substances 47 polybrominated diphenyl ether 47 gasoline vapors 47 carcinogenic benzene 47 VOCs volatile organic compounds 47 nitrogen oxides carbon monoxide 47 hydrogen chloride 47 carbon monoxide nitrogen oxide 47 mercury 47 respiratory irritant 47 bioagents 47 particulate matter nitrogen oxides 47 particulate matter emissions 47 sulfurous compounds 47 carbon monoxide particulate matter 47 toxic wastes 47 ethyl acrylate 47 aluminum dross 47 Countywide landfill 47 harmful pathogens 47 naturally occurring bacteria 47 acrolein 47 VOC volatile organic compounds 47 tetrahydrofuran 47 TCE contamination 47 Contaminant 47 ethyl mesylate 47 neutron radiation 47 Particulate matter 47 wastewater effluent 47 odorant molecules 47 methyl tert butyl ether 47 respiratory illnesses 47 tainted vermiculite 47 organophosphate pesticide 47 aggravate allergies 47 aerosolised 47 PVC phthalates 47 Contaminated groundwater 47 deplete oxygen 47 dioxane 47 DecaBDE 47 Particulate 47 Elemental mercury 47 nauseating odors 47 chlorinated compounds 47 inhaled asbestos fibers 47 allergens irritants 47 butter flavoring diacetyl 47 colorless odorless radioactive 47 vapor intrusion 46 microcystin 46 hazmat crews 46 bacteria listeria monocytogenes 46 atmospheric deposition 46 amalgam dental fillings 46 barium chromium 46 Contaminated soil 46 arsenic cyanide 46 E.coli bacteria 46 VOC emissions 46 Breathing ozone 46 toxicosis 46 asbestos contaminated vermiculite 46 hydrocyanic acid 46 Hydrogen Sulfide H2S 46 heptyl 46 diesel particulate 46 cockroach allergen 46 Staphylococcus aureus bacteria 46 Methylmercury 46 cadmium chromium 46 biphenyls PCBs 46 diarrheal illnesses 46 metallic ions 46 potentially carcinogenic 46 airborne irritants 46 C. diff spores 46 estrogenic compounds 46 lung irritant 46 enterococci bacteria 46 radioactivity 46 radon naturally occurring 46 corrosive gases 46 solvent trichlorethylene 46 ozone pollutant 46 ammonium perfluorooctanoate 46 radioactive thorium 46 ignitable liquids 46 polycyclic aromatic hydrocarbons PAHs 46 chemical #,# butanediol 46 Legionella bacterium 46 particulate matter soot 46 flammable methane 46 mercury potent neurotoxin 46 biohazardous waste 46 radium contamination 46 potent neurotoxin 46 carcinogen hexavalent chromium 46 Carbon monoxide 46 Bromate 46 arsine 46 electro magnetic waves 46 sooty particles 46 respiratory irritants 46 dioxin concentrations 46 Polychlorinated biphenyls 46 chlorine bromine 46 disagreeable odor 46 leachates 46 organochlorine 46 Pollutants 46 trans palmitoleate 46 radioactive depleted uranium 46 fungus spores 46 Branchport Creek 46 groundwater plume 46 Anthrax spores 46 Klebsiella bacteria 46 chemical solvents 46 radioactive materials 46 nitrogen trifluoride 46 fracing fluids 46 thirdhand smoke 46 biohazards 46 sulfur dioxide 46 chromium VI 46 BPA leaching 46 PAHs 46 PM#s 46 microscopic particles 46 methylamine 46 TiO2 nanoparticles 46 contaminated soils 46 carbon dioxide concentrations 46 vinyl shower curtains 46 acrid odor 46 Dechlorane Plus 46 smog forming gases 46 asthmatic symptoms 46 combustion gases 46 refrigerant leaks 46 garbage incinerators 46 Microcystis 46 perfluorinated compounds PFCs 46 Nitric acid 46 sulfur dioxides 46 neutralized VX 46 Particle pollution 46 Haz Mat crews 46 pthalates 46 legionella bacterium 46 mercury sulfur dioxide 46 radioactive material 46 mercury amalgam fillings 46 Burning charcoal 46 solvent toluene 46 microscopic airborne particles 46 reproductive toxins 46 emit pollutants 46 inhaling asbestos 46 gasses 46 osmium tetroxide 46 carcinogenic PCBs 46 radioactive 46 flame retardant chemicals 46 perfluoroalkyl acids 46 organotins 46 filtrations 46 bioaccumulation 46 Hexavalent Chromium 46 hazardous materials 46 bacteria Clostridium botulinum 46 trigger allergic reactions 46 endocrine disrupting chemicals EDCs 46 Palos Verdes Shelf 46 Toxic fumes 46 naturally occurring asbestos 46 chlorine ammonia 46 VOCs volatile 46 petroleum hydrocarbons 46 Polycyclic aromatic hydrocarbons 46 microbiological contamination 46 sulfurous gases 46 antibiotic resistant microbes 46 genetic susceptibilities 46 naturally occurring algae 46 mercury chromium 46 chlorides 46 Radioactive contamination 46 EtO 46 Sulfuric 45 radon 45 nauseating odor 45 bacteria 45 Dioxins 45 transuranic 45 microbial pathogens 45 diesel particulate matter 45 Decomposing bodies 45 carbon dioxides 45 soot particles 45 harmful microorganisms 45 chlorine atoms 45 flammable vapor 45 Fecal bacteria 45 sludges 45 formaldehyde preservative commonly 45 Poo Gloos 45 fluorotelomer 45 animal dander 45 allergy inducing 45 Brominated flame retardants 45 domoic acid naturally occurring 45 saxitoxin 45 mercury vapor 45 Khamisiyah 45 Chlorinated 45 toxic fume 45 toxicity 45 chemical 45 oxidises 45 bisulfite 45 biodegraded 45 chromium 45 mercury pollution 45 acrylamides 45 Fumitoxin 45 ozone depleting gases 45 sodium dichromate 45 enteric bacteria 45 chlorobenzene 45 americium 45 tailpipes smokestacks 45 Methyl mercury 45 #,# Dioxane 45 fine particle pollution 45 poisons 45 poisonous vapors 45 endocrine disrupting compounds 45 toxic alkaloids 45 oral malodor 45 Chlorine dioxide 45 potent carcinogens 45 contrast chlorine disinfection 45 asthma chronic bronchitis 45 musty odors 45 radioactive contaminants 45 cryptosporidium parasite 45 flame retardants PBDEs 45 asbestos 45 methyl hydrate 45 trimethylamine 45 nitrous acid 45 benzo pyrene 45 containing soot dioxins 45 contaminated 45 Radioactive tritium 45 e.coli bacteria 45 Carbon Monoxide CO 45 tropospheric ozone 45 anesthetic gases 45 fecal coliforms 45 gases vapors 45 PM# particles 45 foul odor 45 radioactive isotope tritium 45 nitrogen oxides NOx emissions 45 iron sulfide 45 tetrachloroethene PCE 45 cleaning solvents 45 gamma radiation 45 waterborne bacteria 45 carcinogenic 45 causes Legionnaire disease 45 Fecal coliform bacteria 45 organochlorine compounds 45 bacterium Bordetella pertussis 45 rancid odor 45 formaldehyde 45 decaying vegetation 45 acrid fumes 45 ammonia nitrogen 45 airborne pollutant 45 hydroxyl radicals 45 recontaminated 45 chemical ammonium perfluorooctanoate 45 degrease metal parts 45 naturally occurring radium 45 sulfur dioxide carbon monoxide 45 elevated radon 45 dioxin contaminated 45 aspergillus 45 microbials 45 fume inhalation 45 radionuclide detection 45 inhaling noxious 45 selenium concentrations 45 tritium radioactive 45 bioaccumulate 45 crystalline silica dust 45 gender bending chemicals 45 polluted soils 45 triclocarban 45 powerful neurotoxin 45 Norlite 45 superoxide radicals 45 PM#.# particles 45 specialist Maria Duazo 45 volatilize 45 Corexit dispersant 45 contaminates 45 exothermic reaction 45 Chrysotile asbestos 45 dichloroethene 45 fluorides 45 smokestack scrubbers 45 arsenic concentrations 45 Serum phosphorus 45 cadmium poisoning 45 vinyl lunchboxes 45 Contamination 45 raw untreated sewage 45 soot particulates 45 hexachlorobenzene 45 DDT dieldrin 45 pentachlorophenol PCP 45 emitting radiation 45 pentachlorophenol 45 pollutant concentrations 45 penicillium 45 biphenyl 45 secondhand smoke 45 aggravates respiratory 45 PBDE contamination 45 hydrogen cyanide 45 carcinogen 45 Groundwater contamination 45 Household cleaners 45 sodium hydrosulfite 45 mercaptans 45 contaminating groundwater 45 polychlorinated biphenyls 45 nitrogen oxides NOx 45 decaying algae 45 ozone precursors 44 arsenic barium 44 gaseous emissions 44 malfunctioning furnace 44 fluorotelomers 44 brevetoxins 44 cyanogen chloride 44 heterocyclic amines HCAs 44 thallium toxic 44 arsenic beryllium 44 nitrogen oxides sulfur oxides 44 chlorine bleaches 44 arsenic manganese 44 organophosphorous 44 domoic acid toxin 44 sulfer 44 beta HCH 44 hydroxyl radical 44 Nitrogen Oxide 44 paradichlorobenzene 44 transuranic wastes 44 magnesium sodium potassium 44 sulfuric acids 44 intranasal zinc 44 aromatic amine 44 potentially harmful 44 shigella bacteria 44 ammonia fumes 44 Stachybotrys chartarum 44 radionuclides 44 putrid smell 44 nitrogen oxides emitted 44 phosphorous nitrogen 44 orthophosphate 44 hormone disrupter 44 prussic acid 44 EPA Safe Drinking 44 cyanide arsenic 44 dental amalgams 44 Phosgene 44 naturally occurring arsenic 44 Nitrogen dioxide 44 aluminum phosphide 44 sulfolane 44 neurotoxin 44 E. Coli O# H7 44 butter flavorings 44 radioactive contamination 44 krypton gas 44 PFOA perfluorooctanoic acid 44 S. marcescens 44 synthetic musks 44 sulfuric gases 44 #,# dioxane 44 occupationally exposed 44 soot 44 perfringens 44 lung cancer mesothelioma 44 waste decomposes 44 sulfuric 44 Particulate Matter PM 44 H2S 44 vaccine preservative 44 soot pollution 44 Zonolite insulation 44 aerosolize 44 botulism spores 44 stormwater overflows 44 sulfur oxide 44 photochemical smog 44 pollen spores 44 HumiFilters 44 corrosive flammable 44 caustic wastewater 44 fibrous mineral 44 estrogen mimicking 44 dental amalgam fillings 44 Cryptosporidium parasite 44 pesticide malathion 44 chemical methyl isocyanate 44 combination Peruga 44 carbon monoxide byproduct 44 silver dental fillings 44 oxidising 44 odors emanating 44 microwaving popcorn 44 releasing toxic fumes 44 chromium cadmium 44 carbon monoxide CO 44 chronic beryllium 44 ozone depleting refrigerants 44 E. coli bacteria 44 hex chrome 44 trace amounts 44 deplete ozone 44 furanones 44 radioactively contaminated 44 Domoic acid 44 food borne pathogen 44 hexachlorobenzene HCB 44 tailpipe gases 44 food borne pathogens 44 air pollutants emitted 44 chlorinated hydrocarbon 44 Polybrominated 44 corrosive acid 44 contaminate groundwater 44 sodium bromide 44 mercury emitted 44 Endocrine disruptors 44 toxic methylmercury 44 chlorine residuals 44 inorganic mercury 44 pathogenic microbes 44 aggravate respiratory 44 neutralize acids 44 Dioxin 44 filter impurities 44 allergenic proteins 44 olfactory stimuli 44 radionuclide contamination 44 acids solvents 44 quaternary amines 44 waterborne microbes 44 Polychlorinated Biphenyls PCBs 44 lime slurry 44 contaminate shellfish 44 dental fillings 44 contaminated sediments 44 microwave popcorn bags 44 plasticizers 44 organo phosphate 44 Phosphine 44 bacterium Clostridium 44 bioaccumulates 44 corroded wiring 44 odor emanating 44 harmful residues 44 engineered nanomaterials 44 oxidisation 44 benzopyrene 44 chemical perchlorethylene 44 perfluorocarbons 44 washwater 44 semicarbazide 44 pesticide aldicarb 44 lewisite 44 Tittabawassee River floodplain 44 Nitrogen Dioxide 44 ozone nitrogen dioxide 44 sulfur oxide SOx 44 elemental mercury 44 mercury PCBs 44 oxidizers 44 putrid smells 44 perchlorate plume 44 organophosphate pesticides