Related by context. Frequent words. (Click for all words.) 63 smog 59 thick haze 56 smoggy 53 haze 49 air pollution 49 Thick fog 48 Sandstorms 48 peat bog fires 47 peat fires 47 Thick smoke 46 Heavy fog 46 soot particles 46 acrid smoke 46 pollution 45 sandstorms 45 smoky haze 45 traffic jams 44 Smog 44 uncollected garbage 44 airborne pollutants 43 Dense fog 43 wildfires raging 43 forest fires 42 snarled traffic 42 oppressive heat 42 stifling humidity 42 sweltering temperatures 41 Meteorological Bureau 41 sweltering heat 41 smoke plumes 41 Songhua River 41 traffic snarls 41 raging wildfires 41 heavy snowfalls 41 bone chilling temperatures 41 Rainstorms 40 Himalayan peaks 40 frigid weather 40 Heavy snowfall 40 Snowstorms 40 scorching heat 40 sandstorm 40 SARS epidemic 40 Traffic jams 40 soot 40 brushfires 40 dengue outbreak 39 blanketed 39 grayness 39 oppressive humidity 39 stench 39 polluting factories 39 particulate pollution 39 thick fog 39 blizzards 39 acid rain 39 billowing clouds 39 exhaust fumes 39 wildfires 39 eerily empty 39 particulates 39 unseasonably warm temperatures 39 Iceland volcanic ash 39 pall 39 asthma bronchitis 38 Frigid temperatures 38 polluted 38 Melting snow 38 Beijing 38 gusting winds 38 toxic fumes 38 Blowing snow 38 Heavy downpours 38 asthmatics 38 bone chilling cold 38 heavy snowfall 38 freezing temperatures 38 Olympic Games 38 Tian'anmen Square 38 torrential rain 38 Downpours 38 rotten egg smell 38 snowstorms 38 scorching temperatures 38 Beijing Olympics 38 fog 38 intermittent rains 37 fine particle pollution 37 humid weather 37 blackouts 37 Snow sleet 37 Fierce winds 37 Bitter cold 37 heavy snows 37 Overcast skies 37 Freezing temperatures 37 digit temperatures 37 Pollution 37 stifling heat 37 Olympics 37 humidity