Air pollution is mainly caused by productive pollution, traffic pollution and life pollution. Air pollution not only does harm and disaster to forests, rivers, oceans, animals and plants, but also does great harm to human health, leading to acute poisoning and chronic respiratory and digestive diseases. In the 1950s, an air pollution incident occurred in London, England, and the death toll reached 4,703 in one month, all because of the severe irritation of sulfur dioxide to the respiratory tract. Air pollution not only makes people uneasy, but also causes chronic tracheitis, chronic pharyngitis, rhinitis, bronchial asthma, pneumoconiosis, lung cancer, myocardial infarction, gastric cancer and other diseases. In recent years, the incidence of respiratory tract among residents in major cities around the world has increased, and their illness has become increasingly serious, which is directly related to the increasingly serious air pollution around the world. Air pollution will also affect the growth of crops, reduce the yield, make crops contain residual poison, pollute drinking water and food, thus endangering human health in many ways and causing a vicious circle.
Fresh air makes people comfortable, while dirty air makes people uncomfortable, even makes people sick and endangers people's lives. Therefore, in order to improve immunity, we should go to a place with fresh air for a full meal on holidays.