Related by context. Frequent words. (Click for all words.) 68 pollution 58 pollutants 58 air pollution 57 polluting 57 pollutant emissions 56 toxic pollutants 55 polluted 54 pollutant 54 Pollution 54 effluents 53 environmental degradation 50 Pollutants 50 harmful gases 49 harmful pollutants 49 noxious gases 49 hazardous substances 48 noxious 48 toxic wastes 48 airborne pollutants 48 pollute 48 toxic chemicals 48 carbon dioxide emission 47 greenhouse gasses 47 fine particulates 47 toxic substances 47 CO2 emission 47 harmful toxins 47 harmful substances 47 emission 47 smog 46 polluting industries 46 Polluted 46 emissions 46 acid rain 46 toxic waste 46 particulates 46 toxics 46 air toxics 46 Carbon dioxide emissions 46 GHGs 46 exhaust emissions 46 VOCs 46 Greenhouse gases 45 particulate emissions 45 carbon emission 45 contaminants 45 noxious fumes 45 fine particle pollution 44 particulate matter 44 toxins 44 spillages 44 eutrophication 44 soil erosion 44 polluters 44 polluted rivers 44 CO2 emissions 44 polluted runoff 44 SO2 44 CO2 43 harmful chemicals 43 greenhouse gas emission 43 NOx emissions 43 degradation 43 nutrient pollution 43 particulate matter PM 43 greenhouse gases 43 carbon dioxide emissions 42 NO2 42 polluter 42 Contaminants 42 Co2 42 particulate pollution 42 radioactive substances 42 particulate 42 GHG emissions 42 pollutes 42 impurities 42 carbon emissions 42 toxic gases 42 exhaust fumes 42 ozone depleting substances 42 carbons 42 diesel fumes 42 siltation 42 greenhouse emissions 41 carbon dioxide CO2 41 impurity 41 harmful 41 emission reduction 41 desertification 41 anthropogenic 41 environmentally damaging 41 hazardous wastes 41 ecological catastrophe 41 polluting factories 41 environmental 41 adverse impacts 41 silting 41 soot 41 mercury pollution 41 toxic