Related by context. All words. (Click for frequent words.) 77 fine particle pollution 77 particulate matter 75 fine particulate pollution 74 air pollution 73 fine particulates 71 particulates 70 fine particulate matter 69 Particle pollution 69 PM#.# 68 particle pollution 67 Particulate matter 67 ozone pollution 66 pollutants 65 diesel particulate matter 64 soot pollution 64 diesel particulates 63 pollutant 63 smog forming pollution 63 smog 63 airborne pollutants 63 soot particles 62 ozone 62 ozone smog 62 Diesel exhaust 62 Particulate pollution 61 PM#s 61 pollution 61 nitrous oxides 61 coarse particulate matter 61 airborne particulate matter 60 particulate 60 pollutants emitted 60 fine particulate 60 ozone concentrations 59 NOx emissions 59 particulate emissions 59 particulate matter emissions 58 smog forming pollutants 58 air toxics 58 nitrogen dioxide 58 emissions 58 ultrafine particles 58 soot 58 pollutant ozone 58 sulfur dioxide emissions 58 SO2 emissions 58 nitrogen oxides 58 ozone particulate matter 58 particulate matter PM 58 nitrogen oxide NOx emissions 57 #,# butadiene 57 airborne soot 57 airshed 57 nitrogen oxide emissions 57 PM# [003] 57 particle concentrations 57 gaseous pollutants 57 nonattainment areas 57 smog forming emissions 57 nitrogen oxide 56 exceedences 56 microscopic soot 56 airborne particulates 56 diesel exhaust 56 NOx 56 sulfur dioxide 56 Carbon dioxide emissions 55 Fine particulate matter 55 sooty particles 55 Nitrogen oxides 55 nonattainment 55 pollutant emissions 55 particulate pollutants 55 smoggiest 55 coarse particulates 55 toxic pollutants 55 Particulates 54 airborne pollutant 54 toxic pollutant 54 particulate soot 54 PM# particles 54 Nitrogen dioxide 54 nitrogen oxides NOx 54 greenhouse gases 54 emmissions 54 pollutant particles 54 airsheds 54 mercury pollution 53 respirable particles 53 nitrogen oxides emitted 53 Air Quality 53 nitrogen oxide pollution 53 carbon dioxide emissions 53 PAHs 53 secondhand smoke 53 Sulfur dioxide 53 mercury emitted 53 exceedances 53 tropospheric ozone 52 smog forming nitrogen oxides 52 Nitrogen oxide 52 hydrocarbons carbon monoxide 52 diesel particulate emissions 52 airborne particles 52 Fine particle pollution 52 smoggy 52 ug/m3 52 particulate matter emitted 52 Gauderman 52 Tailpipe emissions 52 Particulate Matter 52 carbon monoxide nitrogen dioxide 52 greenhouse gasses 52 tailpipe pollutants 52 harmful pollutants 52 smog forming 52 greenhouse gases GHG 52 tailpipe exhaust 52 mercury emissions 52 tiny airborne particles 52 THMs 52 sulfur dioxide SO2 52 aggravates respiratory 52 greenhouse gas emissions 52 carbon monoxide hydrocarbons 51 Sulfur dioxide emissions 51 indoor radon 51 NOX emissions 51 SO2 51 gases emitted 51 Pollutants 51 nitrous oxide emissions 51 emission 51 silica dust 51 Air Pollution 51 haloacetic acids 51 Particulate Matter PM 51 smokestack pollutants 51 ozone pollutant 51 diesel particulate 51 Smog 50 carbon monoxide particulate matter 50 ozone particulates 50 Emissions 50 greenhouses gases 50 NO2 50 carbon monoxide 50 nitrogen deposition 50 particulate concentrations 50 sulfur dioxide emission 50 Urbaszewski 50 greenhouse gas 50 chloride concentrations 50 Sulphur dioxide 50 nitrogen oxides carbon monoxide 50 exhaust emissions 50 smog forming gases 50 microscopic soot particles 50 sulfur dioxide pollution 50 sulfur dioxide pollutant 50 emissons 50 PAH concentrations 50 soot particulates 50 sulfur dioxide nitrogen dioxide 50 carbon dioxide 50 Fine particulate 50 microcystins 50 atmospheric ozone 50 GHG emissions 49 gaseous emissions 49 atmospheric pollutants 49 airborne toxins 49 Particulate emissions 49 HAAs 49 radon concentrations 49 photochemical smog 49 particles emitted 49 VOC emissions 49 mercury sulfur dioxide 49 VOCs 49 particle soot 49 Schkolnick 49 diesel fumes 49 phosphorus pollution 49 coarse particles 49 Nitrogen Oxide 49 irritate lungs 49 tailpipe emissions 49 particulate emission 49 smog advisories 49 ozone precursors 49 SO2 emission 49 nitrogen dioxide NO2 49 particulate matter PM# 48 nitrogen dioxide emissions 48 ozone nitrogen dioxide 48 emit pollutants 48 soot smog 48 naturally occurring arsenic 48 secondhand smoke exposure 48 fluorinated gases 48 ozone nonattainment 48 greenhouse emissions 48 mercury 48 inhalable particles 48 elevated radon 48 carbon tetrachloride 48 Fine particulates 48 carbon monoxide nitrogen oxides 48 combustion byproducts 48 toxicants 48 Ultrafine particles 48 anthropogenic greenhouse gases 48 carbon emissions 48 GHGs 48 ozone precursor 48 smoggiest regions 48 chlorine byproducts 48 nitrogen oxide emission 48 CO2 emissions 48 noxious pollutants 48 volatile organic compounds 48 polution 48 smog forming chemicals 48 oxidized mercury 48 microcystin 48 NAAQS 47 AB# mandates 47 nonattainment designation 47 nitrogen oxides NOx emissions 47 CO -2 emissions 47 asthma chronic bronchitis 47 harmful tailpipe emissions 47 emission reductions 47 Nitrogen oxide emissions 47 Carbon monoxide CO 47 aerosol concentrations 47 carbon dioxide concentrations 47 coarser particulate matter 47 nitrous oxide N2O 47 Secondhand smoke 47 Sensitive Groups 47 Hydrogen sulfide 47 ghg emissions 47 biomass combustion 47 sulfur gases 47 smokiest 47 μg/m3 47 asthma sufferers 47 cockroach allergens 47 bioaccumulative 47 PM#.# particles 47 carcinogen benzene 47 Ambient Air 47 lung ailments 47 respiratory irritant 47 pCi l 47 toxic chemicals 47 smokestack emissions 47 anthropogenic greenhouse gas 47 water vapor 47 groundwater contaminant 47 Greenhouse gasses 47 Carbon dioxide CO2 emissions 47 aggravates asthma 47 AQHI 47 Greenhouse gases 47 C# emissions 47 nitrous oxide emission 47 tailpipe gases 46 anthropogenic carbon dioxide 46 Carbon monoxide 46 mercury vapors 46 respiratory illnesses 46 trichlorethylene 46 PM# particulate matter 46 polyaromatic hydrocarbons 46 woodstoves 46 soot emitted 46 Breathing ozone 46 exceedence 46 airborne particulate 46 hydrogen sulfide 46 Pollution 46 nitrogen trifluoride 46 asthma bronchitis 46 Nitrogen Dioxide 46 heavily polluted 46 sulfur dioxides 46 Liberty Clairton 46 radon 46 perchlorate contamination 46 arsenic concentrations 46 ozone depleting gases 46 mercury potent neurotoxin 46 greenhouse gases GHGs 46 perchlorethylene 46 respirable suspended particulate matter 46 phosphorus runoff 46 particulate matter soot 46 nitrogen dioxide carbon monoxide 46 smog forming compounds 46 Carbon dioxide CO2 46 atmospheric CO2 levels 46 smokestack scrubbers 46 manmade greenhouse gases 46 GHG emission 46 TCE vapors 46 aerosol particles 46 #,# DCB 46 carcinogens 46 heat trapping carbon dioxide 46 designated nonattainment 46 carcinogenic chemicals 46 disinfection byproducts 46 particulate matter sulfur dioxide 46 TTHMs 46 trihalomethanes THMs 46 atmospheric deposition 46 sulfur dioxide SO2 emissions 46 odorless colorless gas 46 harmful vapors 46 PBDE chemicals 46 greenhouse gas emission 46 polycyclic aromatic hydrocarbons 46 AQMD 46 sulfur dioxide SO2 nitrogen 46 Fecal coliform 46 pollutants sulfur dioxide 45 particles PM#.# 45 GhG emissions 45 wood stoves 45 carbon dioxide CO2 45 carbon disulfide 45 particulate matter nitrogen oxides 45 PAH compounds 45 aggravate asthma 45 tetrachloroethene 45 acid rain 45 incomplete combustion 45 chemical vapors 45 exceedance 45 algal toxins 45 sulfur oxides 45 temperature inversion 45 pollutant emission 45 Bq/m3 45 harmful particulates 45 phosphorus concentrations 45 pedestrian fatalities 45 ocean acidity 45 sulfate aerosol 45 assimilative capacity 45 ozone attainment 45 endocrine disrupting chemicals EDCs 45 total dissolved solids 45 OWBs 45 naturally occurring fluoride 45 nitrogen oxide NOx 45 Algae blooms 45 formaldehyde carcinogen 45 carbon monoxide sulfur dioxide 45 harmful contaminants 45 particulate matter SPM 45 gases 45 Nitrogen Oxides 45 Polycyclic aromatic hydrocarbons 45 respiratory irritants 45 Volatile organic compounds 45 Particulate 45 methane 45 airborne contaminants 45 Volatile Organic Compounds 45 springtime ozone 45 haloacetic acid 45 atmospheric methane 45 greenhouse gas GHG emissions 45 spontaneously ignite 45 Blowing dust 45 carcinogens benzene 45 exhaust fumes 45 anthropogenic emissions 45 CO ² emissions 45 coal tar sealants 45 toxaphene 45 manmade CO2 emissions 45 cockroach allergen 45 smog soot 45 temperature inversions 45 vog 45 polluted 45 perfluorocarbons 45 toxic gasses 45 sulfur dioxide carbon monoxide 45 perchlorate 45 respirable suspended particulates 45 Passive smoking 45 mercury contamination 45 Air Pollution Control 45 carbon dioxide CO ² 45 trihalomethane 45 nitrogen oxide NOX 45 harmful gases 45 chemical ammonium perfluorooctanoate 45 sulfate aerosols 45 heat trapping gases 44 mercury polluter 44 ragweed pollen 44 pollutant concentrations 44 nitrogen oxide sulfur dioxide 44 indoor allergens 44 carcinogenic compounds 44 passive smoking 44 Doe Run smelter 44 secondhand smoke SHS 44 trichloramine 44 teragrams 44 toxins 44 benzene 44 stratospheric ozone depletion 44 cigarette smoke 44 Sulfur Dioxide 44 carbon dioxide emitted 44 Co2 emissions 44 hydrogen sulfide ammonia 44 nitrate contamination 44 enterococcus bacteria 44 Sulfur compounds 44 Toxic Release Inventory 44 NOx emission 44 trihalomethanes 44 unburned hydrocarbons carbon monoxide 44 pesticide exposures 44 Carbon monoxide poisoning 44 Soot 44 tailpipe emission 44 Fecal bacteria 44 toxic algal blooms 44 trichlorethylene TCE 44 greenhouse gases emitted 44 dioxins 44 inversion layer 44 Asbestos fibers 44 thirdhand smoke 44 sulfur dioxide nitrogen oxide 44 contaminants 44 PM#.# exposure 44 air pollutants emitted 44 tiny soot particles 44 exhaust emission 44 methyl mercury 44 contaminant concentrations 44 sulfur dioxide nitrogen 44 unhealthful 44 suspected carcinogen 44 fecal coliform 44 carcinogen 44 harmful gasses 44 microcystis 44 Microcystis 44 aerosols 44 pCi L 44 manmade greenhouse gas 44 nitrogen dioxides 44 tremolite asbestos 44 carbon monoxide nitrogen oxide 44 Peanut allergies 44 aggravate respiratory 44 containing soot dioxins 44 CO poisonings 44 Methylmercury 44 arsenic 44 emmisions 44 CO2 44 PAHs polycyclic aromatic hydrocarbons 44 sulfur hexafluoride 44 algae bloom 44 respirable particulate matter 44 House Gases GHGs 44 heat trapping emissions 44 dissolved solids 44 NOx nitrogen oxides 44 dischargers 44 garbage incinerators 44 methane CH4 44 benzene carcinogen 44 deca BDE 44 PCBs polychlorinated biphenyls 44 pesticide poisonings 44 stringent emission 43 asthmatics 43 Nitrogen Oxide NOx 43 nitrous oxide NOx 43 asthma 43 CO -2 43 wastewater discharges 43 colorless odorless poisonous 43 Volatile Organic Compounds VOC 43 James Gauderman 43 SO2 sulfur dioxide 43 sulfur oxide 43 potent greenhouse gas 43 fecal bacteria 43 organochlorines 43 respiratory ailments 43 burning fossil fuels 43 Lung Association 43 acrolein 43 tobacco specific nitrosamines 43 harmful toxins 43 benzo pyrene 43 dust particles 43 noxious gasses 43 atmospheric CO 43 reduce NOx emissions 43 sulfur oxide SOx 43 invisible odorless tasteless 43 BLLs 43 sulphate aerosols 43 carbon dioxide sulfur dioxide 43 nitrates 43 Air Toxics 43 oVOCs 43 atmospheric CO2 concentration 43 #g CO2/km [001] 43 sulfolane 43 tetrachlorethylene 43 sulfuryl fluoride 43 droplet nuclei 43 contaminant 43 ozone depleting substance 43 carcinogenic polycyclic aromatic hydrocarbons 43 lung irritant 43 ultraviolet UV radiation 43 ash 43 carbon emitted 43 harmful byproducts 43 SOx emissions 43 RSPM 43 carcinogenic fumes 43 toxic vapors 43 total coliforms 43 μg m 3 43 sulfur dioxide SOx 43 trivalent chromium 43 nitrate concentrations 43 precipitation 43 ppbv 43 gypsum byproduct 43 reduce carbon emissions 43 polluting 43 VOCs emitted 43 El Niños 43 naturally occurring radium 43 ultra violet radiation 43 disinfectant byproducts 43 algae blooms 43 Adequate ventilation 43 airborne allergens 43 emmission 43 carbondioxide emissions 43 woodsmoke 43 nitrous acid 43 polluted groundwater 43 harmful chemicals 43 mold spores 43 carbon dioxide emission 43 pCi L. 43 emitted 43 enterococci bacteria 43 carbon dioxides 43 respiratory illness 43 sulfates 43 EPA 43 Norlite 43 groundwater withdrawals 42 perfluorochemicals PFCs 42 PFBA 42 crystalline silica 42 toxic gases 42 Diesel fumes 42 Particle Pollution 42 Burning fossil fuels 42 combustion gases 42 coarse particulate 42 μg m 42 polluter 42 hydrocarbons nitrogen oxides 42 ppb 42 chromium 42 PVC shower curtains 42 trichloroethene 42 SOx 42 secondhand tobacco 42 ppmv 42 invasive meningococcal disease 42 phosphorus 42 Sadredin 42 Secondhand smoke exposure 42 pollutions 42 Diarmid Campbell Lendrum 42 Visibilities 42 beachwater samples 42 mercury vapor 42 CO2 concentrations 42 CO2 emitted 42 emit sulfur dioxide 42 TTHM 42 Toxics Release Inventory TRI 42 anthropogenic CO2 42 hexavalent chromium 42 carbon monoxide CO 42 indoor wood stoves 42 global warming gasses 42 Houston Galveston Brazoria 42 lung diseases 42 Algal blooms 42 tailpipe 42 dioxides 42 emission reduction 42 Volatile Organic Compound VOC 42 Vapor intrusion 42 chemical perfluorooctanoic acid PFOA 42 nonroad diesel engines 42 global warming gases 42 prolonged exertion 42 Carbon tetrachloride 42 fluorocarbons 42 airborne asbestos fibers 42 mercury concentrations 42 methyl chloride 42 Darting subjects 42 Contaminated groundwater 42 organophosphate pesticides 42 nitrogen NOx 42 prenatal exposures 42 Pollutant 42 bark beetle infestations 42 GHG permitting 42 sulfur dioxide nitrogen oxides 42 Environmental Protection Agency 42 Catastrophic wildfires 42 smog acid 42 fluorosis 42 smoggy skies 42 Carbon Monoxide CO 42 polluted runoff 42 PCBs dioxins 42 sewer overflows 42 PBDEs 42 inorganic mercury 42 chemical bromate 42 Staci Simonich 42 UV radiation 42 Clean Air 42 polycyclic aromatic hydrocarbon 42 micrograms 42 E.Coli bacteria 42 sewage overflows 42 cigarette butt litter 42 polluted stormwater runoff 42 radioactive isotope iodine 42 naturally occurring asbestos 42 Emilie Moorhouse 42 Sewage spills 42 Harmful algal blooms 42 creosote buildup 42 Global Warming Potential GWP 42 eruptive activity 42 chloramines 42 nitrous oxides NOx 42 bronchitis asthma 42 NOX SOX 42 nutrient discharges 42 Enterococcus bacteria 42 inorganic arsenic 42 colder drier 42 sulfur dioxide emitted 42 pollutant discharges 42 hydrocarbon vapors 42 carbon dioxide CO2 emissions 42 N2O emissions 41 sulfur trioxide 41 sulfur gasses 41 warming gases 41 LRAPA 41 reduce SO2 emissions 41 Norovirus infection 41 phytoplankton blooms 41 GHG pollution 41 respirable 41 cow enteric 41 smog forming nitrogen oxide 41 nutrient pollution 41 GHG emitter 41 perc 41 gasses emitted 41 BAAQMD 41 Nitrogen NOx 41 atmospheric aerosols 41 wastewater discharge 41 sewage spills 41 dioxide emissions 41 deplete oxygen 41 vinyl chloride 41 sulfuric dioxide 41 outgassing 41 pesticide residue 41 sulphates 41 sewage discharges 41 nutrient runoff 41 Liaohe River 41 hazardous vapors 41 CO2 emmissions 41 respirable suspended 41 ammonia nitrogen 41 algal bloom 41 cow burps 41 dietary sodium 41 untreated tooth decay 41 DBPs 41 carcinogenic dioxins 41 marine biotoxin 41 fuel moistures 41 greenhouse emission 41 turbidity 41 tritium concentrations 41 Pigeon droppings 41 Relative humidity 41 cleaner burning 41 nicotine vapor 41 Peter Iwanowicz 41 radiative forcing 41 carbondioxide 41 organophosphate exposure 41 ultrafine particle 41 Endocrine disruptors 41 concentrations 41 electromagnetic fields EMFs 41 anthropogenic CO 41 polycyclic aromatic hydrocarbons PAHs 41 nonpoint source pollution 41 cement kiln 41 groundwater plume 41 Carbon Monoxide 41 hoofed critters 41 heat trapping gases emitted 41 asbestos fibers 41 hookah smokers 41 Peanut allergy 41 potent neurotoxin 41 unintentional poisoning 41 polluters 41 toxic flame retardants 41 stormwater overflows 41 CO ² 41 bacteria enterococci 41 Taihu Lake 41 nitrogen oxides particulate matter 41 sun ultraviolet radiation 41 sulfate concentrations 41 volcanic smog 41 particulate traps 41 chlordane 41 trichloroethane 41 oxide sulfur hexafluoride 41 waterborne illness 41 methyl cyanide 41 legionella bacteria 41 cow flatulence 41 Tobacco Smoke 41 BTEX 41 Quality Standards NAAQS 41 flame retardant chemicals 41 monoxide 41 reducing visibilities 41 Francesca Dominici 41 Shawn Ferreria 41 CO2emissions 41 fumes 41 e coli bacteria 41 Dissolved oxygen 41 smog haze 41 fecal coliform bacteria 41 persistent bio accumulative 41 greenhouse gas nitrous oxide 41 Chromium VI 41 deplete ozone 41 toxic algae blooms 41 UVB rays 41 arsenic mercury 41 fecal coliforms 41 smoke belching factories 41 explosive eruptions 41 CO ₂ 41 nitrogen discharges 41 severe fluorosis 41 UVA radiation 41 potent carcinogen 41 #g CO2/km [002] 41 oxidation catalysts 41 greenhouse gas concentrations 41 TCE trichlorethylene 41 reducing carbon emissions 41 carcinogen NNK 41 oral malodor 41 nonfasting triglycerides 41 nutrient loadings 41 pollen 40 Dioxane 40 trans fat intake 40 allergenic pollen 40 pine pollen 40 carbolic acid particles 40 pollen spores 40 nonroad diesel 40 sulfur dioxide nitrous oxide 40 Seilback 40 Legionella bacteria 40 NOx nitrogen oxide 40 beryllium dust 40 hydrocarbons HC 40 lung disease 40 carbon dioxide equivalent CO2e 40 NPRI 40 perfluorochemicals 40 Carbon dioxide 40 stormwater runoff 40 beachwater quality 40 atrazine herbicide 40 hazy skies 40 Rapid Transit ridership 40 tpy CO2e 40 circulatory diseases 40 brownish haze 40 asthma emphysema 40 Palaeocene Eocene Thermal Maximum 40 polychlorinated biphenyls PCBs 40 aromatic hydrocarbons 40 insecticide chlorpyrifos 40 chloramine 40 VOCs volatile organic compounds 40 airborne mold spores 40 groundwater contamination 40 sulfur dioxide mercury 40 dust mite allergen 40 greenhouse gas GHG 40 heat trapping pollutants 40 inhaling secondhand smoke 40 stormwater pollution 40 groundwater pumping 40 Stormwater runoff 40 Vitamin D deficiency 40 salivary cotinine 40 chlorpyrifos 40 organic pollutants POPs 40 SO2 NOx 40 Ozone depletion 40 chlorides 40 mesosphere 40 exertion outdoors 40 seawater pH 40 sulphate particles 40 thicker carotid arteries 40 lung irritants 40 oxide hydrofluorocarbons perfluorocarbons 40 Nonattainment 40 carbon dioxide CO2 emission 40 Coliform bacteria 40 Polluted runoff 40 coughing shortness 40 tiny particles 40 waste incinerators 40 nonfatal heart 40 Le Quere 40 GHG concentrations 40 nitrogen oxides sulfur oxides 40 nutrient loading 40 mg/m3 40 nitrobenzene 40 toxics 40 nonpoint 40 groundwater 40 raw sewage overflows 40 Carbon dioxide emission 40 ammonia hydrogen sulfide 40 cTnT levels 40 erionite 40 gasses 40 Burning charcoal 40 juglone 40 mercury dioxins 40 regulating GHGs 40 toxic fumes 40 enterococcus 40 turbidity cloudiness 40 dieldrin 40 ammonium perfluorooctanoate 40 fluorinated greenhouse gases 40 millirem 40 particulate filters 40 Methyl bromide 40 algal blooms 40 Odours 40 poisonous carbon monoxide 40 solar insolation 40 automobile tailpipes 40 preventable hospitalizations 40 Untreated sewage 40 rems 40 cotinine levels 40 airflows 40 sequestering CO2 40 EnviroFlash 40 nitrosamines 40 Soot particles 40 diacetyl vapors 40 asbestos contamination 40 toxic nitrobenzene 40 Radioactive contamination 40 toxic substances 40 ozone nitrogen oxides 40 Carbon dioxide emitted 40 Dust mites 40 radioactive substances 40 mercury toxicity 40 NOx SOx 40 picocuries 40 TCE 40 nuclides 40 smoggier 40 groundwater depletion 40 Clogged filters 40 coughing wheezing 40 ug l 40 PFOAs 40 wood boilers 40 diarrheal illnesses 40 polluted stormwater 40 unburned hydrocarbons 40 perfluorinated chemicals PFCs 40 persistent wheezing 40 allergy inducing 40 Perchlorate contamination 40 PBDE levels 40 atmospheric CO2 40 IGCC plants 40 neurotoxin 40 Transit ridership 40 Abdominal fat 40 Karen Schkolnick spokeswoman 40 Volatile Organic Compounds VOCs 40 E. coli bacteria 40 cryptosporidium parasite 40 Elemental mercury 40 fungal organisms 40 Excess sodium 40 dioxins furans 40 lung cancer mesothelioma 40 Greenhouse Gas Inventory 40 amphibole asbestos 40 transit ridership 40 phosphorus discharges 40 Noah Diffenbaugh 40 radionuclide 40 relative humidities 40 TSNAs 40 polar latitudes 40 barium cadmium 40 sulfur dioxide particulate matter 40 Cyanobacteria 40 Trasande 40 nitrogen monoxide 39 Athabasca watershed 39 algal toxin 39 Localized flooding 39 bio accumulative 39 PAH 39 PCB contamination 39 diarrheal illness 39 diazinon 39 PDBEs 39 sulfer dioxide gas 39 solvent vapors 39 pollens 39 obnoxious odors 39 PBDE 39 megatonne reduction 39 coccolithophores 39 carbon dioxide methane nitrous 39 hydrogen sulphide 39 outdoor exertion 39 cyanobacterial blooms 39 methyl chloroform 39 carbon emmissions 39 sulfur oxides SOx 39 Ozone disinfection produces 39 Polluted 39 electromagnetic radiation EMR