You know the air we breathe every day? Haze particulate air as a one-component analysis of the essential elements of human survival in recent years due to growing pollution problems, to discuss air quality only into the field of vision of the people. Many people have become accustomed to, but more people face the dirty air, but would like to know is: the air we breathe every day in the end what ingredients contain? What haze is? Haze is a combination word of fog and haze. China in many areas of the haze foggy weather phenomena incorporated together as severe weather warnings forecast, collectively known as the "fog and haze." Haze is the result of specific climatic conditions and human activities interact. Economic and social activities of high-density population will inevitably emit large amounts of particulate matter, once the discharge capacity than atmospheric circulation and carrying capacity, the concentration of particles will continue to accumulate, when the air convection sluggish, prone to fog and haze. Emissions to the atmosphere are mainly particulate matter what? Atmospheric particulate matter known as total suspended particles, floating in the air means, collectively, the solid and liquid particles having a particle size ranging from about 0.1 to 100 microns. Suspended particulate matter sorted according to particle size diameter, respectively, dust, dust, fog, dust and smoke, which the fog of dust and smoke particles is generally below 10 microns in diameter, particularly a diameter of 2.5 microns or less in fog dust and smoke, particle diameter very Little can be a long time suspended in the air, fog and haze is caused by the culprit, also known as PM2.5. PM2.5 in it? PM2.5 mainly organic carbon, elemental carbon, nitrates, sulfates, nitrates, sulfates, nitrogen and sulfur oxides and transformed into, these gaseous pollutants tend to be human fossil fuels (coal, oil, etc.) and garbage burning caused. PM2.5 particle size is small, large, active, easy incidental toxic and hazardous substances (such as heavy metals, microorganisms etc.), and long residence time in the atmosphere, transmission distance, and thus to human health and the quality of atmospheric environment significant influence. PM2.5 What is the harm? Particulate matter in the air after being inhaled, can accumulate in the respiratory system, the finer particles greater harm to human body, more than 10 microns in diameter particles may be occluded nose, it can also be expelled from the body by coughing and a particle size of less than respirable particulate matter 10 microns can be deposited with the people breathing lungs, and even into the alveoli, the blood, the highest rate in the pulmonary deposition is a particle size of about 1 micron particles. These particles are often smuggle viruses, heavy metals and other hazardous substances, deposited on alveolar damage and alveolar mucosa, causing chronic fibrotic lung tissue, leading to pulmonary heart disease, aggravate asthma, cause chronic nasopharyngitis, chronic bronchitis a series of lesions, severe life-threatening. Particulate matter harmful to children and the elderly are particularly evident. Children often fog and haze cough, a large reason is because the inhalation of pathogenic bacteria, viruses or allergenic substances, such as dust mites, pollen and dust.