Related by context. Frequent words. (Click for all words.) 75 sulfur dioxide emissions 70 SO2 68 NOx emissions 68 sulfur dioxide 67 nitrogen oxide emissions 67 particulate emissions 66 mercury emissions 65 emissions 64 carbon dioxide emissions 63 Emissions 63 NOx 63 GHGs 62 GHG emissions 62 nitrogen oxide 62 greenhouse gasses 61 emission 61 CO2 emissions 61 CO2 60 greenhouse gases 60 greenhouse gas emissions 59 carbon dioxide emission 59 greenhouse gas GHG emissions 59 carbon emissions 59 emission reductions 59 air pollution 58 carbon dioxide 58 pollution 58 particulate pollution 58 mercury pollution 57 nitrogen oxides 57 particulate matter 57 greenhouse emissions 57 pollutants 57 greenhouse gas 57 CO2 emission 57 carbon emission 56 greenhouse gas emission 56 carbon dioxide CO2 56 GHG 56 emission reduction 55 carbon dioxide CO2 emissions 54 Emission 54 Carbon Dioxide 53 pollutant 53 atmospheric CO2 53 coal fired 52 reduce carbon emissions 52 methane 52 carbon dioxide emitted 51 Greenhouse gases 51 particulate 51 atmospheric carbon dioxide 51 particulates 51 ozone pollution 51 toxic pollutants 51 ozone 50 acid rain 50 exhaust emissions 50 reducing CO2 emissions 50 fine particulate matter 49 greenhouse gases emitted 49 tailpipe emissions 49 heat trapping gases 48 flue gas 48 reducing carbon emissions 48 sulfur 48 nitrogen dioxide 48 TWh 47 PM# [003] 47 EPA 47 particle pollution 47 ozone depleting substances 47 Carbon dioxide 47 carbon 47 gases 47 discharges 47 soot 47 turbidity 46 biomass 46 Air Pollution 46 VOCs 46 global warming gases 46 Pollution 46 renewables 45 emitted 45 MWh 45 GWh 45 wastewater discharge 45 Air Pollution Control 45 Clean Air 45 sulfates 45 Greenhouse Gas 45 mercury 45 Air Quality 44 emission allowances 44 coal 44 scrubbers 44 combustion 44 gigawatt hours 44 emit greenhouse gases 44 smog