Today our world is polluted by various causes. This may result in various diseases to human beings. One of the major diseases that are caused due to pollution is asthma. Asthma is a lung disease and it cause whistling sound when u breathe, chest tightness, shortness of breathe and coughing it will occur mostly during night time. Asthma affect people of all ages in the United States more than 22 million people are known to have asthma. Nearly six million of these people are children .keeping our environment is the best way to reduce asthma. Some other precaution is clean house at least once a week, avoid pet animals, and keep the humidity in your house as low as possible
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