AIR POLLUTION LEVELS AND CHRONIC RESPIRATORY DISEASE.
D000397:Air Pollution; D001991:Bronchitis; D002170:Canada; D006306:Health Surveys; D006801:Humans; D009513:New Hampshire; D011656:Pulmonary Emphysema; D012140:Respiratory Tract Diseases; D012907:Smoking; D013223:Statistics as Topic
AIR POLLUTION; BRONCHITIS; CANADA; HEALTH SURVEYS; NEW HAMPSHIRE; PULMONARY EMPHYSEMA; RESPIRATORY TRACT DISEASES; SMOKING; STATISTICS