Q: What is Air Quality Index?
Answer: The Air Quality Index (AQI) is an index that quantitatively describes air quality conditions. The larger the value, the more serious the air pollution is and the greater the harm to human health. The main pollutants involved in air quality assessment are fine particulate matter (pm2.5), inhalable particulate matter (pm10), sulfur dioxide (SO2), nitrogen dioxide (NO2), ozone (O3), and carbon monoxide (CO).
Q: What is PM2.5?
Answer: PM2.5 refers to particulate matter in the atmosphere with a diameter less than or equal to 2.5 microns, also known as particulate matter that can enter the lungs. Its diameter is less than 1/20 the thickness of a human hair. Although PM2.5 is only a small component of the earth's atmosphere, it has an important impact on air quality and visibility. Compared with coarser atmospheric particulate matter, PM2.5 has a small particle size, is rich in a large amount of toxic and harmful substances, stays in the atmosphere for a long time, and is transported over a long distance, so it has a greater impact on human health and the quality of the atmospheric environment. When atmospheric particulate matter is inhaled into the human body, it will directly enter the bronchial tubes, interfere with gas exchange in the lungs, and cause diseases including asthma, bronchitis, and cardiovascular disease.
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