Related by context. Frequent words. (Click for all words.) 28 dirty 27 nicer 27 suck 26 Dirty 24 pollute 24 stinks 24 boring 23 worse 23 sucks 22 smells 22 cleaner 22 happier 21 soot 20 salty 20 better 20 cleaned 20 filthy 19 greasy 19 louder 19 hotter 19 cluttered 18 drier 18 smarter 18 air pollution 18 cooler 18 colder 18 busier 18 sooner 17 even 17 fitter 17 smog 17 polluting 16 stale 16 sweeter 16 Clean 16 quieter 16 fresher 15 older 15 darker 15 heavier 15 pollution 15 harmful 15 harder 15 polluted 14 pollutants 14 contaminated 14 emissions 14 clean 14 farther 14 thicker 13 messy 13 warmer 13 calmer 13 poorer 13 nasty 12 cheaper 12 longer 12 bigger 12 expensive 12 richer 12 wiser 11 fossil fuels 11 faster 11 degrading 11 brighter 11 quicker 11 freer 10 wealthier 10 lighter 10 greener 10 safer 10 harsher 9 smoother 9 clearer 9 coal fired 9 more 9 less 9 fewer 9 easier 8 healthier 8 degraded 7 slower 7 fossil fuel 7 than 7 tighter 7 simpler 7 milder 6 newer 6 deeper 6 bolder 6 steeper 6 riskier 6 thinner 5 tougher 4 stronger 4 stricter 4 closer 4 smaller 3 sharper 2 considerably 0 shorter