What does the weather symbol stand for?

Haze (English: haze, also known as smoke, haze, haze, etc. ).

It is a kind of air pollution formed by solid particles, and its core substance is dust particles suspended in the air, which is called aerosol particles in meteorology.

Haze contains hundreds of atmospheric chemical particles, which invade human respiratory tract and lungs unsuspecting, thus causing respiratory diseases, cardiovascular diseases, blood system, reproductive system and other diseases, such as pharyngitis, emphysema, asthma, rhinitis, bronchitis and so on. Long-term exposure to this environment will also induce lung cancer, myocardial ischemia and injury; Haze is as harmful as smoking? .

Smog also often causes traffic accidents. 1952 The London smog incident caused more than 4,000 deaths and tens of thousands of lung diseases.

Haze is a collection of a large number of tiny dust particles, smoke particles or salt particles suspended in the atmosphere, such as dust, sulfuric acid, nitric acid and organic hydrocarbons in the air, which makes the atmosphere turbid and leads to poor visibility. According to the regulations of People's Republic of China (PRC) and National Meteorological Administration, if the horizontal visibility is less than 10 km, the visual distance obstacle caused by this non-aqueous aerosol system is called haze or gray.

Smog is generally milky white, which will weaken the color of objects, making bright objects in the distance appear red and yellow, and dark objects appear red and blue. The particles that make up the haze are too small to be distinguished by the naked eye. Due to various reasons, atmospheric condensation nuclei will also form haze when they grow up. In this case, the further condensation of water vapor may make haze evolve into light fog, fog and cloud. Haze is mainly composed of aerosols, which may appear at any time of the day.

harm

The composition of smog is very complex, including hundreds of atmospheric particles. Among them, PM 10 is harmful to human health, such as mineral particles, sea salt, sulfate, nitrate and organic aerosol particles. However, PM2.5 can't be filtered by the cilia of nose and mucus of throat because of its fine particles. It can directly enter and adhere to the upper and lower respiratory tract, lungs and alveoli of human body, and even enter blood vessels, and circulate to the whole body with blood.

Cause respiratory diseases such as rhinitis and bronchitis, or increase the probability of cardiovascular diseases. Being in this environment for a long time may even induce lung cancer.

Because ultraviolet rays in sunlight are the only way for the human body to synthesize vitamin D, the weakening of ultraviolet rays directly leads to the high incidence of rickets in children. In addition, ultraviolet light is the main weapon to kill atmospheric microorganisms such as bacteria and viruses in nature. Hazy weather leads to the weakening of ultraviolet rays in the surface layer, which is easy to enhance the activity of infectious bacteria in the air and increase infectious diseases.

Long-term smog weather not only affects physiology, but also easily leads to pessimism. If it is not adjusted in time, it will easily get out of control. If the smog causes a great decline in visibility, it will cause traffic jams and frequent accidents.