Related by context. Frequent words. (Click for all words.) 63 incinerators 57 waste disposal 52 incinerator 50 mercury emissions 49 waste 47 incineration 46 hazardous waste 46 hazardous wastes 46 air pollution 45 pollutant 45 sewage sludge 44 pollutants 44 particulate emissions 43 toxic waste 43 landfills 43 mercury pollution 43 wastes 43 dioxins 42 pollution 42 effluents 42 particulates 42 particulate matter 41 gases 41 toxic substances 41 biosolids 41 mercury 41 plastics 40 sulfur dioxide emissions 40 volatile organic compounds 40 effluent 40 emission 40 emissions 40 coal combustion 40 nitrogen dioxide 40 particulate pollution 40 sulfur dioxide 40 NOx 40 polychlorinated biphenyls 40 gasification 40 toxic chemicals 40 coal fired 40 NOx emissions 40 flue gas 40 coal ash 39 SO2 39 landfill 39 boilers 39 PCBs 38 hospitals 38 GHGs 38 cogeneration 38 wood burning stoves 38 hazardous chemicals 38 PM# [003] 38 gypsum 38 biomass 38 exhaust emissions 38 radioactive waste 38 particulate 38 radioactive substances 38 asbestos 37 carcinogens 37 WEEE 37 ash 37 Covanta 37 hazardous substances 37 industrial 37 fine particulate matter 37 tailings 37 wastewater 37 carbon dioxide emissions 37 banning smoking 37 smelting 37 sludge 37 cubic meter 37 toxic fumes 37 VOCs 37 depleted uranium 36 disinfection 36 nitrogen oxide 36 Emissions 36 rubbish dump 36 carbon dioxide emission 36 biogas 36 crematorium 36 greenhouse gas emission 36 harmful chemicals 36 chlor alkali 36 radioactive material 36 smelters 36 greenhouse gas emissions 36 emission reduction 36 nitrogen oxides 36 suspended solids 36 recycling 36 polyclinics 35 contaminated soil 35 briquettes 35 smoking bans 35 greenhouse gases 35 wood pellets