What is the air quality in the weather forecast?

Three indicators of urban air quality weekly report

① Total suspended particulate matter: This is the main pollution index of atmospheric dustfall. The total suspended particulate matter in the atmosphere mainly comes from industrial waste gas, construction dust, traffic exhaust, material combustion and so on. It contains lead, mercury and manganese that can damage the nervous system, and carcinogens such as benzopyrene, arsenic and chromium. The total suspended particles can adsorb harmful gases, liquids, bacteria and so on. At present, many countries attach great importance to inhalable particulate matter (PM 10) with particle size less than10 micron, especially inhalable aerosol (PM2.5) with particle size less than 2.5 micron. When inhaled into human body, this aerosol particle will penetrate deep into lung tissue, which can cause bronchitis and lung cancer. Limited to the monitoring technology, except for PM 10 which has been monitored in Shanghai, all cities in China generally only monitor TSP. In the national ambient air quality standard revised by 1996, the control standard of PM 10 is added. However, considering that PM2.5 is the most harmful to human health, China will soon formulate new standards to better protect people's physical and mental health.

②. Sulfur dioxide: mainly caused by coal-fired emissions. Sulfur dioxide will be oxidized to form sulfate aerosol in the atmosphere, and its toxicity will increase by more than 10 times, which will seriously endanger human health and lead to chest tightness. Eye irritation, dyspnea and even respiratory failure. The precipitation in this environment is acid rain, which will acidify the water quality and soil, thus causing a large number of fish and plants to die. Sulfur dioxide was once the main pollutant in the industrial development of some developed countries. The smog events, such as Mas Valley in Belgium and Donora in the United States, which are listed as the eight major public hazards in the world, are all caused by serious pollution of sulfur dioxide. China is a big coal-burning country, and the annual emission of sulfur dioxide ranks in the forefront of the world. It is necessary to strengthen the prevention and control of sulfur dioxide and its secondary pollution.

(3) Nitrogen oxides: mainly nitric oxide and nitrogen dioxide, mainly caused by motor vehicle exhaust. It has a strong stimulating effect on human respiratory organs and can cause tracheitis, pneumonia and emphysema. Nitrogen oxides and water can produce nitrate and nitrite. Entering the human body, it can produce strong carcinogen ammonia nitrite, and it can also combine with hemoglobin in human blood, causing people to have symptoms of hypoxia. 1952 the main culprit of photochemical smog in los Angeles, USA is nitrogen oxides. In addition, it also caused extensive damage to plants. It is worth noting that with the rapid development of modern urban traffic, the nitrogen oxides in many cities in China have also seriously exceeded the standard, and the photochemical smog pollution caused by the surge of motor vehicles (including mopeds) has been discovered by environmental monitoring departments in many cities.