Related by context. Frequent words. (Click for all words.) 55 Dust mites 54 acrid odor 53 diesel fumes 52 Diesel exhaust 51 coughing wheezing 51 Nitrogen oxides 51 poisonous fumes 50 asthma bronchitis 50 noxious chemicals 50 smog 49 respiratory irritant 49 Cigarette smoke 49 Hydrogen sulfide 49 airborne toxins 48 exhaust fumes 48 aggravate asthma 48 fumes 48 noxious odors 48 indoor allergens 47 gaseous emissions 47 Loud noises 47 diesel exhaust 47 silica dust 47 combustible gases 46 SoCal wildfire 46 Particulates 46 pet dander 46 carcinogenic chemicals 46 Pungent 46 wheezing coughing 46 post nasal drip 46 noxious fumes 46 corrosives 45 mold fungi 45 Particulate matter 45 animal dander 45 Sulfur dioxide 45 poisonous carbon monoxide 45 cigarette smoke 45 toxic fumes 44 toxic vapors 44 noxious 44 rotten egg odor 44 Indonesian volcano erupts 44 airborne allergens 44 unpleasant smells 44 airborne particulates 44 unpleasant smell 44 temperature inversions 44 methylene chloride 44 asthma emphysema 44 overpowering smell 44 Toxic chemicals 44 airborne particles 43 Allergic reactions 43 trigger allergic reactions 43 air pollution 43 foul odors 43 Prolonged exposure 43 Thick clouds 43 hazardous fumes 43 allergy triggers 43 flammable vapor 43 vapors 43 Asthmatics 43 Burning fossil fuels 43 steam vents 43 putrid smell 43 particulates 42 scratchy throats 42 toxins 42 odors 42 carcinogenic compounds 42 particulate pollution 42 combustion gases 42 toxic chemicals 42 carbon monoxide 42 unpleasant odors 42 suppressants 42 #,# butadiene 42 Peanut allergies 42 Huge plumes 42 Ammonia leak 42 Sulfuric acid 42 Apartment dwellers 42 Smog 42 aromatic hydrocarbons 42 Powerful gusts 42 eye irritations 42 smoky odor 42 odiferous 42 nuisance alarms 42 nitrous oxides 42 harmful toxins 42 secondhand tobacco 42 Smoldering 42 toxic gases 41 lung ailments 41 respiratory ailments 41 cleaning solvents 41 Ultraviolet light