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(Click for frequent words.) 63 toxic chemicals 63 methyl mercury 62 mercury contamination 61 mercury pollution 59 pollutants 58 mercury emissions 58 mercury vapor 58 cadmium 57 elemental mercury 57 arsenic 57 toxic substances 57 toxins 57 toxic pollutants 56 mercury potent neurotoxin 56 PCBs polychlorinated biphenyls 55 PCBs 55 toxic pollutant 55 amalgam dental fillings 55 toxics 55 dental amalgams 54 harmful chemicals 54 methylmercury 54 chromium 54 mercury emitted 54 contaminant 54 fluoride 54 pollutant 54 contaminants 53 mercury arsenic 53 oxidized mercury 53 nitrate 53 microcystin 52 potent neurotoxin 52 carcinogenic dioxins 52 fine particulate pollution 52 PFOA 52 sulfur dioxide 52 flame retardant chemicals 52 dioxins 52 deca BDE 52 carcinogen benzene 52 suspected carcinogen 52 mercury dioxins 52 arsenic mercury 52 radium 52 PBDEs 52 neurotoxin 52 airborne particulates 52 dental amalgam fillings 51 iodine 51 mercury vapors 51 hazardous chemicals 51 inorganic mercury 51 PCBs dioxins 51 BPA 51 algal toxins 51 Fecal coliform 51 particulate matter 51 Methylmercury 51 chlorine byproducts 51 mercury poisoning 51 Elemental mercury 51 HAAs 51 air pollution 51 nitrates 51 cadmium arsenic 51 hexavalent chromium 51 mercury concentrations 51 THMs 51 dental amalgam 51 polychlorinated biphenyls PCBs 50 benzene 50 dioxin 50 benzene carcinogen 50 harmful toxins 50 polychlorinated biphenyl PCB 50 radioactive iodine 50 radioactivity 50 airborne pollutants 50 naturally occurring arsenic 50 sodium 50 perfluorochemicals PFCs 50 cesium 50 ethylmercury 50 radioactive Iodine 50 fine particulate 50 phthalate 50 bisphenol A. 50 tritium 50 carcinogenic chemicals 50 radioactive material 50 haloacetic acid 50 PFOAs 50 phthalates 50 arsenic selenium 50 mercury toxicity 50 fine particle pollution 50 perchlorate 50 mercury amalgam 49 pollution 49 PBDE contamination 49 mmHg millimeters 49 gaseous pollutants 49 toxic flame retardants 49 harmful substances 49 ozone concentrations 49 naturally occurring fluoride 49 beryllium dust 49 e coli bacteria 49 PBDE 49 ozone 49 carbon dioxide 49 TCE vapors 49 indoor radon 49 perfluorinated compounds 49 TTHMs 49 harmful contaminants 49 trihalomethanes THMs 49 mercury selenium 49 toxaphene 49 persistent bio accumulative 49 PFOS 49 hydrofluoric acid 48 carcinogens 48 PAHs polycyclic aromatic hydrocarbons 48 pollutant ozone 48 phosphorus 48 cadmium mercury 48 organochlorine pesticides 48 cadmium chromium 48 perfluorooctane sulfonate PFOS 48 PDBEs 48 tetrachloroethene 48 Illumi Lite LED 48 fine particulates 48 benzopyrene 48 particulate pollution 48 particulates 48 mercury chromium 48 perfluorinated chemicals 48 carbon dioxide CO2 48 total dissolved solids 48 soot smog 48 ozone pollution 48 temperatures 48 cadmium hexavalent chromium 48 Fine particulate 48 chlorine 48 trihalomethanes 48 chromium VI 48 mercury cadmium 48 PCB contamination 48 strontium 48 toxin 48 polychlorinated biphenyls 48 carcinogenic PCBs 48 metal cadmium 48 microcystins 48 thimerosal 48 perfluorooctanoic acid PFOA 48 selenium 48 fecal coliform bacteria 48 radon concentrations 48 vaccine preservative thimerosal 48 temperature 48 PAHs 48 vinyl lunchboxes 47 gender bending chemicals 47 sulfur dioxide SO2 47 air toxics 47 preservative thiomersal 47 phosphorous 47 VOCs 47 chromium chloride 47 Volatile Organic Compounds VOCs 47 DEHA 47 greenhouse gases 47 bisphenol 47 radiation 47 carcinogenic polycyclic aromatic hydrocarbons 47 carcinogenic benzene 47 particulate 47 brominated flame retardants 47 fluorocarbons 47 trace amounts 47 amalgam separators 47 carbon tetrachloride 47 chloride concentrations 47 Sulphur dioxide 47 powerful neurotoxin 47 carbon monoxide 47 haloacetic acids 47 Sodium cyanide 47 trihalomethane 47 airborne toxins 47 sulfolane 47 fever thermometers 47 mercury thermometers 47 canned albacore tuna 47 fecal bacteria 47 arsenic chromium 47 harmful vapors 47 #,# Dioxane 47 VOC emissions 47 Cadmium 47 thiomersal 47 Methyl mercury 47 SO2 46 ozone pollutant 46 hazardous waste 46 PBDE levels 46 dioxin PCBs 46 CO -2 46 radioactive 46 manganese 46 mercury neurotoxin 46 dioxides 46 vinyl chloride 46 airborne particulate matter 46 nitrogen dioxide 46 Dechlorane Plus 46 BPA leaching 46 chloramine 46 Volatile Organic Compounds VOC 46 ozone particulates 46 ash 46 endocrine disrupting chemicals 46 bioaccumulative 46 dissolved solids 46 micrograms 46 solvent toluene 46 bioaccumulates 46 pthalates 46 atmospheric carbon dioxide 46 phthalates chemicals 46 particulate matter soot 46 toxicants 46 DEHP 46 mercury dental fillings 46 Radioactive material 46 radioactive cesium 46 antimony arsenic 46 VOCs Volatile Organic Compounds 46 Nitrogen oxide 46 arsenic cadmium mercury 46 solvent vapors 46 polyaromatic hydrocarbons 46 ozone smog 46 harmful pollutants 46 cadmium barium 46 ammonia nitrogen 46 dental fillings 46 trihalomethane levels 46 Greenhouse gases 46 ozone particulate matter 46 PVC shower curtains 46 toxic dioxins 46 perfluorochemicals 46 fine particulate matter 46 trichlorethylene 46 harmful gasses 46 Toxic chemicals 46 disinfection byproducts 46 BLLs 45 amalgam fillings 45 arsenic bismuth 45 smog soot 45 dioxins furans 45 particulate matter SPM 45 crystalline silica 45 polychlorinated biphenyl 45 Pottersburg Creek 45 gaseous methane 45 dioxin concentrations 45 toxic vapors 45 algal toxin 45 barium 45 carcinogen cadmium 45 Enterococcus bacteria 45 mercury thermostats 45 Mercury Hg 45 chromium cadmium 45 formaldehyde carcinogen 45 flouride 45 carcinogen 45 greenhouses gases 45 tremolite asbestos 45 chloramines 45 dissolved oxygen 45 arsenic cadmium 45 outgas 45 mercury amalgam fillings 45 tooth fillings 45 PCB polychlorinated biphenyls 45 PFCAs 45 smog forming pollutants 45 ppb 45 harmful gases 45 groundwater 45 ultrafine particles 45 organochlorines 45 enterococcus bacteria 45 ozone depleting gases 45 smokestack pollutants 45 Greenhouse gasses 45 Diesel exhaust 45 radionuclides 45 enterococci bacteria 45 sulfide nanoparticles 45 hormone disruptor 45 polychlorinated PCBs 45 formaldehyde 45 mercury thermometer 45 blackwater streams 45 Carbon monoxide CO 45 hazardous wastes 45 mm Hg millimeters 45 picocurie 45 microgram 45 pollutants emitted 45 Dioxane 45 furan 45 chloride 45 polybrominated diphenyl ether PBDE 45 zinc 45 volatile organic compounds 45 Polychlorinated biphenyls 45 SO2 emissions 45 radioactive tritium 45 dioxane 45 thermometers barometers 45 Zonolite insulation 45 chlordane 45 thermometers thermostats 45 reproductive toxins 45 toxic methylmercury 45 toxic byproducts 45 Pollutants 45 chlorine residuals 45 toxic 45 pesticide residue 45 PCBs DDT 45 ug l 45 bromate 45 Nitrogen oxides 44 arsenic contamination 44 arsenic contaminated 44 Sulfur dioxide 44 Hexavalent chromium 44 radon 44 triclocarban 44 PAH concentrations 44 smog 44 invisible odorless tasteless 44 Athabasca watershed 44 benzo pyrene 44 Particle pollution 44 carbon monoxide particulate matter 44 tetrachlorethylene 44 sulfur trioxide 44 potentially harmful 44 chemicals 44 radioactive radium 44 radioactive materials 44 radium naturally occurring 44 carbon dioxide concentrations 44 methyl chloride 44 impurities contaminants 44 acrylamide 44 pesticide chlorpyrifos 44 particulate soot 44 polycarbonate plastic bottles 44 silver dental fillings 44 radioactive substances 44 polybrominated diphenyl ether 44 MeHg 44 DDT PCBs 44 airborne soot 44 Domoic acid 44 Fecal bacteria 44 vaccine preservative 44 sulfuric acid mist 44 furans 44 sulfate concentrations 44 pCi L 44 harmful radiations 44 atmospheric ozone 44 RfD 44 phosphorus pollution 44 diesel particulates 44 Nitrate 44 contaminant concentrations 44 fluorides 44 Reference Dose 44 Nitrogen oxide emissions 44 perfluorinated chemicals PFCs 44 potent carcinogen 44 carbon monoxide sulfur dioxide 44 tetrachlorethylene PCE 44 residual chlorine 44 tropospheric ozone 44 Particulates 44 reproductive toxicants 44 marine biotoxin 44 groundwater contaminant 44 carbon monoxide hydrocarbons 44 fecal coliform 44 endocrine disruptors 44 ethyl mercury 44 unlined landfills 44 disinfectant byproducts 44 nitrogen oxides carbon monoxide 44 sulfur dioxide pollutant 44 Inorganic arsenic 44 Bq/m3 44 polybrominated diphenyl ethers PBDEs 44 soot 44 azinphos methyl 44 photochemical smog 44 sulfur dioxide pollution 43 ultraviolet UV radiation 43 thermometers 43 disinfection byproducts DBPs 43 sulfur dioxide SO2 nitrogen 43 Flame retardants 43 potentially carcinogenic 43 hazardous substances 43 greenhouse gasses 43 Polychlorinated Biphenyls 43 radioactive isotope 43 smokestack emissions 43 humidex values 43 odorless colorless gas 43 Arsenic 43 chemical bromate 43 CO2 43 toxin microcystin 43 μg/m3 43 benzene arsenic 43 sulfur dioxide emissions 43 deplete ozone 43 anomalous arsenic antimony 43 estrogenic chemicals 43 nitrite 43 nitrogen oxide 43 ammonia 43 Sulfur Dioxide 43 mercury fillings 43 BPA phthalates 43 Radioactive substances 43 mercury PCBs 43 Humidex 43 sulfer 43 cyanide arsenic 43 barium cadmium 43 hazardous vapors 43 Particulate pollution 43 PBDE concentrations 43 smog forming 43 organochlorine 43 dioxins PCBs 43 bio accumulative 43 selenium concentrations 43 ultraviolet radiation UVR 43 chlorinated solvents 43 radionuclide 43 perfluorooctane sulfonate 43 PFOA perfluorooctanoic acid 43 fecal chloroform 43 cyanide 43 pesticide 43 contaminents 43 neuro toxin 43 pesticides 43 turbid water 43 hormone disrupting 43 arsenic concentrations 43 Thimerosal 43 perfluorocarbons 43 Elevated mercury 43 methane 43 phthalate DEHP 43 naturally occurring radium 43 dissolved oxygen levels 43 chemical perfluorooctanoic acid 43 respirable particles 43 Farmed salmon 43 organophosphate exposure 43 toxic mercury vapors 43 polybrominated 43 inorganic arsenic 43 toxic wastes 43 trichloroethene 43 harmful byproducts 43 endocrine disrupting chemicals EDCs 43 mercury accumulates 43 smog forming gases 43 arsenide 43 dieldrin 43 toxic mercury vapor 43 bioaccumulation 43 decaBDE 43 Fecal coliform bacteria 43 sodium fluoride 43 smog forming pollution 43 Chromium VI 43 calcium sulfate component 43 carcinogen dioxin 43 DuPont DeLisle plant 43 carcinogenic compounds 43 brevetoxin 43 pentachlorophenol 43 controversial chemical bisphenol 43 Tritium 43 poisonous chemicals 43 carbon dioxide emissions 43 E coli bacteria 43 VOC emission 43 atmospheric deposition 43 remote blackwater streams 43 sulfate 43 iron sulphate 43 hydrogen chloride HCl 43 ultra violet radiation 43 arsenic antimony 43 Groundwater contamination 43 heptachlor 43 carbon disulfide 43 carcinogenic 43 semicarbazide 43 sulfates 42 PM# [003] 42 ug/m3 42 barium chromium 42 endocrine disrupters 42 perfluorocarbons PFCs 42 chemical perfluorooctanoic acid PFOA 42 toxic gasses 42 sulphate aerosols 42 radioiodine 42 radioactive isotope iodine 42 flammable corrosive 42 particulate pollutants 42 denture adhesives 42 chemical bisphenol 42 Bisphenol 42 trichloroethane 42 sulfur dioxide nitrogen dioxide 42 Carbon dioxide emissions 42 chemical C8 42 Brominated flame retardants 42 nitrogen oxides 42 freon 42 toxic polychlorinated biphenyls 42 turbidity 42 MtBE 42 contaminant perchlorate 42 Freon 42 particle concentrations 42 flyash 42 acid rain 42 estrogenic compounds 42 TTHM 42 prenatal exposures 42 synthetic musks 42 arsenic benzene 42 ppm 42 chlorinated compounds 42 ozone depletion 42 airborne particulate 42 E. Coli bacteria 42 sulfur gases 42 damaging ultraviolet rays 42 Mike Shriberg 42 Environmental Protection Agency 42 trans fatty acid 42 organochlorine compounds 42 nitrate nitrogen 42 Hydrogen sulfide 42 DBPs 42 mercury chromium cadmium 42 chlorine disinfectant 42 Enterococci bacteria 42 unflued gas heaters 42 halogenated flame retardants 42 toluene solvent 42 PCBs pesticides 42 NF3 42 transuranic wastes 42 polycyclic aromatic hydrocarbons PAHs 42 bacterial contamination 42 #,# butadiene 42 VOCs volatile 42 oxalates 42 depleted uranium 42 nighttime temps 42 total coliforms 42 glycol ethers 42 flame retardants 42 picocuries 42 toxic methyl mercury 42 contaminated sediment 42 Untreated wastewater 42 sulfur dioxide nitrous oxide 42 iodine cesium 42 DINP 42 methyl chloroform 42 degrees Celsius 42 CFCs chlorofluorocarbons 42 lobster tomalley 42 noxious gases 42 trichloroethene TCE 42 naturally occurring asbestos 42 sulfur dioxide SO2 emissions 42 naturally occurring radioactivity 42 suspended solids 42 tailpipe exhaust 42 nitrous oxides 42 thermostats barometers industrial 42 exceedences 42 spokeswoman Phillippa Cannon 42 vitamin D 42 Dioxins 42 estrogen mimicking 42 anthropogenic carbon dioxide 42 Dioxin 42 particulate matter PM# 42 antimony 42 noxious chemicals 42 cadmium mercury hexavalent 42 PFCs 42 chemical Bisphenol 42 incinerator ash 42 DecaBDE 42 carcinogenic substances 42 biphenyl 42 flame retardants PBDEs 42 toxic chemical bisphenol 42 brevetoxins 42 degreasing solvent 42 chemical #,# butanediol 42 fecal coliforms 42 molten salts 42 dental fillings containing 42 TBBPA 42 preservative thimerosal 41 tritium contaminated 41 thimerosol 41 Tritium occurs naturally 41 drywall emits 41 polycyclic aromatic hydrocarbons 41 thirdhand smoke 41 hydrocarbon vapors 41 dioxide 41 fecal coliform contamination 41 sodium bromide 41 endocrine disrupting compounds 41 waterborne microorganisms 41 radioactive wastes 41 pico curies 41 polychlorinated vinyls 41 heat trapping carbon dioxide 41 tailpipe gases 41 arsenic cadmium chromium 41 nitrobenzene 41 cyanides 41 Bruce Lanphear 41 carcinogens mutagens 41 Carbon dioxide CO2 41 ozone depleting substances 41 stratospheric ozone depletion 41 particulate matter sulfur dioxide 41 chlorofluorocarbon 41 sulfurous gases 41 nondetectable 41 chlorinated solvent 41 perchlorethylene 41 gases 41 pollutant emission 41 anthropogenic greenhouse gas 41 faecal coliform 41 smog forming compounds 41 Windshield washer fluid 41 Radioactive tritium 41 harmful dioxins 41 canned albacore 41 Sulfur dioxide emissions 41 atmospheric CO2 levels 41 particle pollution 41 degrease metal parts 41 sulfurated hydrogen 41 noxious gasses 41 Hexavalent Chromium 41 VOCs volatile organic compounds 41 Endocrine disruptors 41 anthropogenic greenhouse gases 41 particulate concentrations 41 emit sulfur dioxide 41 engineered nanomaterials 41 shark swordfish king mackerel 41 sulfuric gases 41 silica dust 41 PBDE flame retardants 41 diesel particulate matter 41 chemical flame retardants 41 Perfluorinated chemicals 41 trichlorethylene TCE 41 Ambient Air 41 chlorides 41 elevated radon 41 addictive nicotine 41 radioactive isotopes 41 #,# dioxane 41 polybrominated diphenyl ethers 41 degrees Fahrenheit 41 PM#s 41 stormwater overflows 41 arsenic boron 41 radioactive waste 41 Washington Toxics Coalition 41 elemental chlorine 41 atmospheric pollutants 41 thermometers barometers dental amalgams 41 sulphate 41 carcinogenic byproducts 41 soot pollution 41 contamination 41 clogging landfills 41 PM#.# 41 nitrogen dioxide carbon monoxide 41 Microcystis 41 Particulate emissions 41 manganese zinc 41 hydrocarbons carbon monoxide 41 carcinogenic fibers 41 radioactive strontium 41 nitrogen discharges 41 sulfur dioxide nitrogen oxide 41 hydrogen chloride 41 atmospheric CO 41 Chlordane 41 ozone depleting chemicals 41 stratospheric ozone 41 Vinyl chloride 41 formaldehyde benzene 41 PBDE exposure 41 hazardous 41 greenhouse gas 41 EPA 41 smokestack scrubbers 41 radioactive isotope tritium 41 amphibole asbestos 41 concentrations 41 waste incinerators 41 radioactive thorium 41 pesticide contamination 41 nitrates phosphates 41 ReadyScan LED technology 41 PM# particles 41 phosphide 41 emissions 41 airborne pollutant 41 particulate matter nitrogen oxides 41 chlorine disinfectants 41 iodine supplements 41 2ppm 41 sequestering CO2 41 Particulate matter 41 mercury Hg 41 2C #.#F 41 Polychlorinated biphenyls PCBs 41 chromium polybrominated biphenyl PBB 41 pCi L. 41 nitrogen trifluoride 41 PFBA 41 dischargers 41 carcinogenic chemical 41 naturally occurring radioactive 41 degree centigrade 41 carbon dioxides 41 toxic diethylene glycol 41 Carbon dioxide 41 Administrator Carol Browner 41 vermiculite ore 41 arsenic barium 41 airborne particles 41 atmospheric CO2 41 dissolved salts 41 aerosol particles 41 plastic hardener 41 Nitrogen Dioxide 41 Contaminants 41 nitrogen oxide NOX 41 artificial sweetener saccharin 41 greenhouse gas emissions 41 Microscopic particles 41 chemical malachite green 41 Carbon monoxide 40 arsenic cyanide 40 acrolein 40 Wind chills 40 nitrogen oxides emitted 40 urate 40 diesel exhaust 40 toxic residues 40 tar nicotine 40 foul smelling odor 40 Ultrafine particles 40 neurotoxic effects 40 Sorbent Technologies 40 toxicant 40 mimics estrogen 40 Elevated arsenic 40 phosphine gas 40 lindane 40 maximum contaminant 40 polychlorinated 40 chlorinated Tris 40 degree Celsius 40 1ppm 40 ug dl 40 neutron radiation 40 air pollutants emitted 40 vapors emitted 40 containing preservative thimerosal 40 magnesium hydroxide 40 soot particles 40 preservative sulfur dioxide 40 microbiological organisms 40 aquatic toxicity 40 pesticide residues 40 Stachybotrys 40 unhealthful 40 ultraviolet radiation 40 microscopic soot 40 cancer causer 40 atmospheric moisture 40 PCBs dioxin 40 #,#,# trichloroethane 40 Nitrogen dioxide 40 Radiation 40 soot particulates 40 recyclable plastics 40 respiratory illnesses birth defects 40 elevated PBDE 40 DDT dieldrin 40 ozone depleting refrigerants 40 orthophosphate 40 nitrogen monoxide 40 chemical vapors 40 trichloramine 40 potent toxin 40 gasoline vapors 40 carcinogenic pollutants 40 Particulate Matter PM 40 respirable suspended particulate matter 40 Radioactivity 40 phosphorus concentrations 40 toxic hydrogen sulphide 40 particulate matter emissions 40 TCE trichlorethylene 40 carcinogenic substance 40 manmade CO2 emissions 40 benzene toluene xylene 40 Contaminated groundwater 40 triclosan 40 Dissolved oxygen levels 40 coal ash 40 poisonous hydrogen sulphide 40 compact fluorescent lightbulbs 40 PM#.# particles 40 fly ash 40 CO -2 emissions 40 sun ultraviolet radiation 40 beryllium 40 aromatic amine 40 wastewater effluent 40 magnesium calcium 40 benzene vapors 40 coliforms 40 sulfur dioxide particulates 40 Untreated sewage 40 insecticide chlorpyrifos 40 Fluoride 40 hydrogen sulfide 40 ug dL 40 ocean acidity 40 Prenatal vitamins 40 TFAs 40 diphenyl ethers 40 Pollutant 40 Pollution 40 dichloroethylene 40 ash ponds 40 absorb neutrons 40 Trihalomethanes 40 microcystis 40 toxic gases 40 CFLs 40 regulate perchlorate 40 thimerosal mercury containing 40 petroleum hydrocarbons 40 Hazardous substances 40 sulfur dioxide carbon monoxide 40 legionella bacteria 40 nitrogen oxide sulfur dioxide 40 sulfur 40 #,# dichloroethane 40 environmental toxicants 40 phosphorus nitrogen 40 particulate emissions 40 global warming gasses 40 ethyl mesilate 40 cerium 40 nitrous oxide N2O 40 New Idria 40 selenomethionine 40 atmospheric CO2 concentrations 40 endocrine disruptor 40 polluted 40 hexavalent chrome 40 biphenyls 40 phosphate detergents 40 toxic waste 40 lead mercury cadmium 40 hormone cortisol 40 chlorinated hydrocarbons 40 picocuries per 40 nonstick cookware 40 sulfur oxide SOx 40 Teflon cookware 40 heat trapping gases 40 groundwater contamination 40 aquatic organisms 40 potability 40 carbon dioxide CO ² 40 leachable 40 particulate matter emitted 40 radioactive depleted uranium 40 microscopic soot particles 40 resuspend 40 Maximum Contaminant Levels 40 refrigerant 40 lead cadmium arsenic 40 electromagnetic fields EMFs 40 biphenyls PCBs 40 HoltraChem 40 mercury vapor lamps 40 sphygmomanometers 40 PBDE chemicals 40 8C #F 40 Rapid Transit ridership 40 brominated flame retardant 40 nitrogen dioxide NO2 40 enterococci 40 zinc oxide nanoparticles 40 fatty acids eicosapentaenoic acid 40 chromium mercury 40 mercury preservative 40 methylene chloride 40 unhealthy trans fatty 40 2oC 40 particulate opacity mercury 40 aromatic amines 40 Iodine 40 coarse particulate matter 40 Volatile Organic Compound VOC 40 Squalene 40 solvents 40 organochlorine pesticide 40 fluorine 40 Selenium supplements 40 NO2 40 diethylene glycol DEG 40 corrosive flammable 40 arsenic manganese 40 #ppb [003] 40 nitrogen oxide emissions 40 environmentally hazardous substances 40 biotoxin 40 sulfurous compounds 40 sulfur dioxide SOx 40 PBTs 40 Shiranui Sea 40 methane gas 40 perfluorooctanoate PFOA 40 Overnight temperatures 40 magnesium carbonate 40 Cohansey aquifer 40 vinyl bibs 40 aerosol concentrations 40 brominated flame retardants BFR 40 americium 40 PCBs mercury 39 degree celsius 39 reflow temperatures 39 emission 39 marine biotoxins 39 Ozone disinfection produces