Related by context. Frequent words. (Click for all words.) 67 asthma bronchitis 60 chronic lung 59 aggravate asthma 57 chronic respiratory 56 respiratory diseases 55 lung diseases 54 respiratory illnesses 54 asthma 53 asthmatics 53 respiratory ailments 52 coughing wheezing 52 allergies asthma 52 COPD 52 asthma allergies 51 lung ailments 51 asthma sufferers 51 chronic pulmonary 50 chronic obstructive pulmonary 50 chronic illnesses 50 pulmonary diseases 50 chronic bronchitis 50 respiratory 50 Asthmatics 50 asthma triggers 49 pulmonary disease 49 respiratory infections 49 lung disease 49 pet dander 49 chronic cough 49 lipid disorders 48 respiratory symptoms 48 colds flu 48 Asthma 48 compromised immune 47 emphysema 47 Prolonged exposure 47 skin ulcers 47 hypertension diabetes 47 sinus congestion 47 weakened immune systems 47 asthma chronic obstructive 47 suppressed immune 46 chronic illness 46 chronic diseases 46 Chronic Obstructive Pulmonary Disease 46 asthmatic 46 Particulate matter 45 Sinusitis 45 nasal polyps 45 skin irritations 45 reflux disease 45 fine particle pollution 45 respiratory illness 45 asthma sufferer 45 asthma COPD 45 neurologic disorders 45 Antihistamines 45 stuffy nose 45 respiratory disorders 45 musculoskeletal diseases 45 fine particulates 45 immunocompromised 45 hypertension 45 lung function 45 immuno compromised 44 Ulcerative colitis 44 diarrhea abdominal pain 44 immunosuppressed 44 decongestants 44 cough sore throat 44 chronic 44 itchy eyes 44 multiple sclerosis rheumatoid arthritis 44 air pollution 44 diabetes hypertension 44 bronchial asthma 44 Shortness 44 bronchiolitis 44 disease COPD 44 Inhaled 44 fever muscle aches 44 Kidney stones 44 renal impairment 44 harmful gases 44 pollutants 43 seizure disorders 43 Passive smoking 43 diabetes cardiovascular disease 43 persistent cough 43 nasal congestion 43 containing DEET 43 toxicants 43 colorless odorless gas 43 noncommunicable diseases 43 uncontrolled hypertension 43 breathing difficulties 43 modifiable risk 43 hyperthyroidism 43 Undiagnosed 43 dehydration abdominal pain 43 ozone smog