Related by context. Frequent words. (Click for all words.) 65 air pollution 63 mercury emissions 62 pollutants 60 particulate matter 59 mercury pollution 58 pollutant 58 volatile organic compounds 58 diesel exhaust 57 nitrogen oxide 56 particulates 56 pollution 55 particle pollution 55 VOCs 55 EPA 55 emissions 54 sulfur dioxide emissions 54 emission 53 Clean Air 53 carcinogens 53 toxics 53 Air Quality 52 Environmental Protection Agency 52 tailpipe emissions 51 nitrogen oxides 51 contaminants 51 exhaust emissions 51 radon 50 soot 50 Emissions 50 NOx 50 groundwater contamination 50 particulate 50 sulfur dioxide 50 greenhouse gases 49 ozone 49 toxic chemicals 49 secondhand smoke 49 hazardous substances 49 Air Pollution Control 48 PFOA 48 smog 48 hazardous chemicals 47 mercury 47 hazardous waste 47 Environmental Quality 47 greenhouse gas 47 greenhouse gas emission 47 PCBs 47 dioxins 47 harmful chemicals 47 carbon dioxide emissions 47 benzene 47 greenhouse gas emissions 47 emission reductions 46 greenhouse gasses 46 heat trapping gases 46 TCEQ 46 DEQ 46 toxic substances 45 GHG emissions 45 coal fired 45 carcinogen 44 phthalates 44 GHG 44 greenhouse emissions 43 arsenic 43 contaminant 43 toxicity 43 respiratory illnesses 43 asbestos exposure 43 chromium 43 radium 43 PAH 43 carbon emission 42 coal ash 42 carbon monoxide 42 Pollution 42 formaldehyde 42 Superfund site 42 incinerators 42 emission reduction 42 ppb 42 IDEM 42 emitting 42 Safe Drinking Water 42 CARB 42 TCE 42 VOC 42 asbestos 42 carbon emissions 42 CO2 emissions 42 toxins 42 lung diseases 41 perchlorate 41 NIOSH 41 Radon 41 Clean Water Act 41 stormwater runoff 41 acrylamide 41 KDHE 41 respiratory ailments