| Filtering common sense |
| Atmospheric dust |
| 2008-10-27 15:31:08 |
| (has been browse 672 times) |
| Atmospheric dust Dust particle size distribution In the atmosphere of large dust particles as a result of the settlement of gravity, small dust particles as a result of collision between the formation of large particles. The natural world, not so much a collision, and difficult settlement of suspended dust in the atmosphere for a long time. In ancient times, dust from the natural world in the campaign, such as wind, volcanoes, ocean waves, pollen. Modern, a large number of dust raised by human activities such as burning, industrial pollution. Compared with the ancestors, we encountered dust, the number, size small, it is not the nature of friendship. Outside the atmosphere, by volume, 99.9 percent of the dust particle size is less than 1mm. By weight, the dust is less than 10mm of the total weight of 50% to 95%. The difference in the concentration of dust Today's air pollution due to human activities. A direct impact on the population size of urban air concentrations of dust. Roughly speaking, the bigger the city, the more serious pollution. As the heat and dry climate, most of the dust in the atmosphere of the city in winter was significantly higher than other seasons. The rainy season, due to the rain washing, the concentration of dust in the air than other seasons. Indoor and outdoor, indoor dust the number of high-concentration, the total weight of small dust. And the evaporation of sea water waves generated little salt (sodium chloride), a high concentration of salt in coastal areas. Urban air concentration no less than that of rural micro-organisms, but in the cities of harmful micro-organisms to high concentrations of air. The number of typical environmental concentration Places of concentration of tablets / l Burning cigarette smoke 10,000,000,000 Highway 1,000,000,000 City 100,000,000 Country-de-sac 10,000,000 Village 1,000,000 Marine 100,000 Arctic 10,000 |
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