Related by context. Frequent words. (Click for all words.) 71 aggravate asthma 67 asthma emphysema 67 lung diseases 67 respiratory illnesses 66 coughing wheezing 66 respiratory ailments 65 lung ailments 64 asthma allergies 63 chronic respiratory 63 respiratory diseases 63 chronic lung 62 asthma 60 chronic bronchitis 60 respiratory 59 allergies asthma 57 lung disease 57 pulmonary diseases 57 pulmonary disease 56 respiratory infections 55 chronic cough 55 colds flu 55 chronic pulmonary 54 Asthmatics 54 asthmatics 54 itchy eyes 53 asthma sufferers 53 bronchial asthma 53 bronchiolitis 53 skin rashes 53 Prolonged exposure 53 pet dander 53 chronic obstructive pulmonary 53 air pollution 53 respiratory illness 52 Particulate matter 52 bronchitis 52 breathing difficulties 52 nausea headaches 52 Passive smoking 52 respiratory symptoms 52 throat irritation 51 respiratory tract 51 diabetes cardiovascular disease 51 acute bronchitis 51 respiratory disorders 51 sinus infections 51 sinusitis 51 nasal congestion 51 rhinitis 51 gallbladder disease 51 asthmatic 51 emphysema 50 skin ulcers 50 lung infections 50 asthma chronic obstructive 50 thyroid disorders 50 chest tightness 50 COPD 50 decongestants 50 chronic illnesses 49 Shortness 49 sneezing coughing 49 fine particulates 49 asthma triggers 49 stuffy nose 49 recurrent infections 49 persistent cough 49 dehydration abdominal pain 49 Sinusitis 49 nausea dizziness 48 fever muscle aches 48 fine particle pollution 48 soot particles 48 cardiovascular diseases 48 particulate matter 48 Periodontal disease 48 particulates 48 seizures coma 48 eye irritation 48 allergies 48 runny noses 48 lung function 48 blindness kidney 48 Antihistamines 48 induced asthma 47 harmful gases 47 hypertension diabetes 47 inflammations 47 secondhand tobacco 47 chronic diseases 47 viral infections 47 diesel exhaust 47 earaches 47 Cigarette smoke 47 gastrointestinal infections 47 skin irritations 47 diabetes hypertension 47 sore throats 47 hemolytic anemia 47 diarrhea vomiting 47 lung