Related by context. Frequent words. (Click for all words.) 85 pollution 76 smog 74 pollutants 71 pollutant 70 particulate matter 67 Pollution 67 emissions 64 emission 63 particulates 63 greenhouse gases 62 ozone 62 mercury emissions 62 greenhouse gas emissions 62 carbon dioxide emissions 60 nitrogen oxides 60 greenhouse gas 60 sulfur dioxide 59 Air Quality 58 greenhouse emissions 58 Emissions 57 soot 56 carbon emissions 56 Clean Air 56 acid rain 56 carbon emission 55 secondhand smoke 54 GHG emissions 54 CO2 emissions 54 polluted 53 EPA 53 toxic chemicals 53 traffic congestion 53 Environmental Protection Agency 53 asthma 53 congestion 53 polluting 52 carbon dioxide 52 environmental 51 respiratory illnesses 51 mercury 50 polluter 50 emission reduction 50 polluters 49 volatile organic compounds 49 emission reductions 49 global warming 49 CO2 49 benzene 48 radon 48 GHG 48 heat trapping gases 48 carbon monoxide 48 coal fired 47 reduce carbon emissions 47 stormwater runoff 47 respiratory diseases 47 burning fossil fuels 46 respiratory illness 46 pollute 46 carcinogens 46 cleaner burning 45 toxins 45 Asthma 45 gases 44 Lung Association 44 urban sprawl 44 climate change 44 dioxins 44 contaminants 44 toxic substances 44 cigarette smoke 44 hydrogen sulfide 44 smokestacks 43 methane 43 pesticide 43 emitted 43 hazardous waste 43 Environmental Quality 43 reducing carbon emissions 43 pesticides 43 lung disease 43 dioxin 42 hazardous chemicals 42 odors 42 contaminant 42 noise 42 arsenic 42 cigarette smoking 42 harmful chemicals 42 hazardous substances 42 groundwater 42 Water Quality 42 contamination 41 environmental impacts 41 carcinogen 41 fumes 41 incinerators 41 humidity 41 childhood obesity 41 TCEQ 41 aerosols