I. harm to human health
Man needs air to breathe in order to live. An adult breathes about 20,000 times a day, inhaling 15 to 20 cubic meters of air. Therefore, polluted air has a direct impact on human health.
The harm that air contaminant is various to human body, main show is respiratory tract disease and physiology function obstacle, and the mucous membrane such as eye nose is organized by stimulation and sicking.
Second, the harm to plants
Air pollutants, especially sulfur dioxide, fluoride and other harmful to plants is very serious. When the concentration of pollutants is very high, it will cause acute damage to the plant, making the plant leaf surface to produce damage spots, or directly make the leaf wither and fall off; When the concentration of pollutants is not high, it will cause chronic damage to the plant, making the plant leaves fade green, or the symptoms of damage can not be seen on the surface, but the physiological function of the plant has been affected, resulting in the decline of plant yield and deterioration of quality.
Impact on weather and climate
The impact of atmospheric pollutants on weather and climate is very significant, which can be illustrated from the following aspects:
Reduce the amount of solar radiation reaching the ground: the amount of solar radiation reaching the ground is reduced by the large amount of soot particles emitted into the atmosphere from factories, power stations, cars and home heating equipment, making the air very cloudy and blocking the sunlight. On smoggy days in big industrial cities, the amount of direct sunlight hitting the ground is nearly 40% less than on smog-free days, according to the survey. Air pollution is serious city, everyday such, can bring about person and plant to grow bad because of lack sunshine.
Increased atmospheric precipitation: particles emitted from large industrial cities, many of which act as condensation nuclei for water vapour. Therefore, when there are some other precipitation conditions in the atmosphere with it, there will be precipitation weather. Downwind of the big industrial cities, more precipitation.
Acid rain: sometimes, rain falling from the sky contains sulfuric acid. This acid rain is the atmospheric pollutant sulfur dioxide oxidation form sulfuric acid, with the nature of the precipitation fall. Sulfuric acid rain can destroy large areas of forests and crops, corrode and break paper, textiles, leather products and other products, deteriorate the anti-rust coating of metals and reduce the protection effect, and corrode and pollute buildings.
Increase atmospheric temperature: in the large industrial cities above, because there is a large amount of waste heat emissions into the air, therefore, near the ground air temperature is higher than the surrounding suburbs. This phenomenon is known in meteorology as the "heat island effect".